Indoor Air Quality

Click on the manufacturers listed below to go to their websites for viewing the many products in stock at DESCO Energy. Click on the underlined blue text for areas of more explanation in our website. Chose from a wide array of manufacturers including Herrmidifier, Skuttle, Trion, Nutone, Broan, Fedders, Tappan, Amana and Goodman Indoor Air Quality products. For assistance call us toll free at 877-265-9764 or email info@descoenergy.com










HEPA Filtration Fresh Air Ventilation and Energy Recovery


Hepa Filtration Systems Whole House

Hepa Filtration Systems Commercial Industrial

Hepa Filtration with Fresh Air Ventilation

Hepa Filtration with Energy Recovery and Fresh Air Ventilation

Fresh Air Ventilation System Only


Air Filtration

Electronic Air Cleaners

High Media Air Filters

High Grade Disposable Filters

HEPA Filters



Bypass Flow Through Humidifiers

Powered Flow Through Humidifiers

Electric Steam Humidifiers

 Mist Humidifiers

Air/Water Atomizing Humidifiers

Steam to Steam Humidification Systems



Ventilation and Exhaust Systems

Smoke cleaning systems

Kitchen Exhaust Systems

Dust Collection Systems

Heat Recovery Engineered Systems



DESCO Energy and SEER Solutions for Energy Efficient Results will guide you through the entire process of sizing and selecting the most efficient HVAC Indoor Air Quality System for your house or business. We recommend all potential customers review all the information provided in our Getting Started and Solutions section of the web site. When you're ready an Online Sizing Form using Manual J is provided to complete with detailed construction and sizing of your home including location and insulation values to determine the exact heating and air conditioning requirements of your building. This valuable information provides the necessary information to accurately select and size the heating and air conditioning system that's right for you.


Indoor air quality has become increasingly popular among every type of user and application whether it is your home, business or manufacturing operation. For over 34 years DESCO  Energy has designed and engineered indoor air quality systems for every type of application including all types of manufacturing. Indoor air quality is about indoor air that is properly cleaned, circulated, humidified and dehumidified. But the bottom line is indoor air quality is all about comfort, health and creating a safe indoor environment. Achieving indoor air quality will not only improve health and comfort but also increase energy efficiency.


Today's new higher energy efficient homes and buildings are so tight they can create toxic environments without sufficient outside air to dilute the accumulating pollutants. At wall insulation values above R-13 and ceiling values above R-19 a building can be too tight to allow any infiltration of outside air and will easily accumulate toxic levels of indoor pollutants. Proper amounts of fresh outside air must be introduced into today's tighter buildings to dilute indoor pollution and to control humidity. We strongly recommend any house or building with insulation levels of R-19 or above in walls needs to consider a heat recovery fresh air ventilation system. 



Your house or business may only require proper air filtration and humidification to achieve a healthy indoor environment. At a minimum every forced air heating and air conditioning system should have the following items to achieve a normal healthy indoor air environment. A high media filter, humidifier and variable speed drive motor. A high media filter to provide the best level of air filtration at the least cost. A humidifier to increase health, protect valuable furniture and other wood items, decrease temperature settings and eliminate static electricity. And a variable speed blower motor to provide higher levels of indoor summer and winter comfort.


Whether your needs are for your home, business or industrial applications DESCO Energy can provide the best system for you at wholesale pricing. And we'll show you how your new system may be eligible for Tax Credits under the New Energy Bill.

On January 23, 2006 all HVAC manufacturers have been mandated to only produce air conditioning systems with a minimum 13 Seer or Seasonal Energy Efficiency Ratio. Heat Pumps are also mandated for the same air conditioning efficiency with a minimum 7.7 HSPF or Heating Seasonal Performance Factor. 13 Seer line will be the lowest grade equipment produced with the lesser of all warranties. The 2006 Energy Tax Bill will offer tax credit rebates effective for equipment installed on or after January 1, 2006. A $300 rebate will be offered for split system air conditioning systems of 15+ Seer or packaged systems with 14 Seer. There are also tax credit rebates of $50 for variable speed blower motors. Heat pumps with the same 15 Seer air conditioning and 9.0 HSPF are also eligible for a $300 rebate. Gas furnaces with 95% AFUE efficiencies or higher are eligible for $150 Tax Credits while the addition of Variable Speed adds an additional tax credit of $50 for a total of $200. Total tax credits for a single home up to $500 are available for a wide variety of energy improvements. For more details see The Energy Star website.


Four key ways to improve your home's indoor air quality:

1. Identify sources of indoor air pollution. Awareness and information are the keys to better understanding indoor air quality. Eliminating smoking indoors, cleaning regularly and maintaining your HVAC equipment properly are good first steps to removing contaminants in your home.

2. Provide adequate ventilation. Start by removing contaminants with a quiet bathroom fan and a ducted kitchen range hood. Next, dilute contaminants to an acceptable level with a whole-house continuous ventilation system (Air Exchanger). Rapidly eliminating contaminants at the source lessens the possibility of dissipation throughout your home. A constant exchange of stale air with fresh air provides a more healthy, comfortable home. Broan offers a broad range of solutions that will suit your whole-house needs.

3. Filter incoming outside air with a whole-house air cleaning system. Using a filtration system in your home will lower the concentration of dust, pollen and other particulates from indoor air. Proper filter maintenance is important to sustain performance.

4. Control indoor humidity. While humidity is not a pollutant, it can create a range of problems, from health concerns to structural problems. Maintain indoor relative humidity between 40 to 60 percent to minimize mold, mildew and other possible hazards.


Customer Service
Frequently Asked Questions: Indoor Air Quality (IAQ)

Why would I need an ERV or an HRV for my home?
Would I be able to improve my air quality with just a ventilator?
Why is an HRV or ERV system better than a regular ventilator?
Must I also install bath fans if I choose to install an IAQ system?
How much fresh air is needed in a home?
Who installs IAQ equipment?
What types of controls are available to operate the IAQ equipment?
Where is an ERV or HRV installed?
Can I use a Broan-NuTone residential ERV or HRV (100 or 200) to ventilate my pool or spa areas?
Can I wire my IAQ equipment to my furnace so it only runs when my furnace is running?
Why must I have a balanced ventilation system?
What type of ducting does the equipment require?
What is the difference between an HRV and an ERV? Which should I choose for my home?


Why would I need an ERV or an HRV for my home?

The air circulation within your home may be good, but more likely the air quality is poor. It's damp, stuffy, or making you sick. Replacing appliances such as a furnace or water heater, installing new windows or adding siding to a home changes the air leakage rate. Any improvements made to a home that reduces airflow in a house may result in insufficient natural ventilation. Excess moisture destroys your windows and building structure. Mold, mildew, carbon monoxide and chemical pollutants are harmful to human health. You need to build tight, but more important, ventilate right.

Would I be able to improve my air quality with just a ventilator?

Healthy indoor air requires you add a mixture of regular fresh outdoor air. Tighter building construction causes negative pressure when bath fans, kitchen range vents, clothes dryers and other exhaust equipment are in use. Your vent fans suffer. They will not be effective and motors will wear out more quickly.

Why is an HRV or ERV system better than a regular ventilator?

Ventilators do not recover the energy (heat or cooler temperature) from the air being exhausted. An ERV and HRV unit transfers the temperature to the fresh air being drawn into the home. Reheating or cooling costs become minimal in comparison to heating or cooling air being drawn in through cracks and leaks in your building structure.

Must I also install bath fans if I choose to install an IAQ system?

An IAQ vent system cannot be as effective if the high levels of humidity generated by today's shower and tub systems is allowed to dissipate throughout the entire house. It should be removed at the source by running a bathroom exhaust fan for 20-30 minutes after each shower. Your bathrooms should be properly measured and fans for each room must be chosen with proper CFM (Cubic Feet of air per Minute). Then the house's general ventilating system can control the moisture.


Can I ventilate my bath fans through an IAQ system's ductwork?

It is not recommended that you do this. When an IAQ system has been properly sized and balanced, any vent fan that operates during operation of the IAQ will unbalance that system, rendering it ineffective. The high humidity from the bathroom, along with any odors, may be circulated throughout the rest of the house.

How much fresh air is needed in a home?

A vent system designed to provide fresh air must provide approximately one-third (0.35) air changes per hour.

To calculate the required minimum CFM, divide the square footage of your house by 20, or consult a qualified HVAC contractor to properly size your building.

Who installs IAQ equipment?

Generally it should be installed where your furnace and A/C is because proper sizing and balancing of the system is critical. The unit must be installed in areas that do not get below 40°F. A floor or pipe drain must be available.

What types of controls are available to operate the IAQ equipment?

Low voltage wiring (4-conductor telephone-type cable) is required to install the humidity controls, which activate and operate the ventilation equipment. The ERV must have one of the Central controls. The VT3W (our DETECTOR model) activates the ERV by sensing pollutants (not humidity). There are also 20 minute push-button timers available to activate the units for short intervals rather than operating in a "constant on" mode.


Where is an ERV or HRV installed?

Because the unit is equipped with drains to eliminate humidity from the air, the unit must be installed in an area that does not get below 40° F. A floor or pipe drain must be provided.

Can I use a Broan-NuTone residential ERV or HRV (100 or 200) to ventilate my pool or spa areas?

No. The units are not equipped to handle the high humidity or chemical laden air generated within such an extreme situation. There is a special HRV700 in the line which accommodates that need for ventilation.

Can I wire my IAQ equipment to my furnace so it only runs when my furnace is running?

No. It is not possible to have your furnace turn your ventilator on due to the electronic circuitry. However, it is possible to wire just your furnace blower to operate while your ventilator is running so that the most effective ventilation of your whole house is possible. If you are in the habit of closing bedroom doors or other rooms you may have "dead air pockets" in your home. The furnace blower helps the fresh, dry air reach the rooms farthest from the ventilator.

Why must I have a balanced ventilation system?

Recent studies show that natural ventilation (leaks and cracks) does not provide adequate fresh air into houses. Energy efficient construction has challenged us to overcome the bad health effects and damaging humidity that tightly constructed buildings have caused. Natural ventilation does not provide adequate ventilation to control these contaminants.


What type of ducting does the equipment require?

Your system can be direct-ducted. That is, an independent ducting system can be installed in new construction. This may not work well in old construction. Your unit can be installed in your existing forced air furnace duct, which simplifies the installation in old construction. Both types of installation require a 6" inlet and a 6" exhaust port.

What is the difference between an HRV and an ERV? Which should I choose for my home?

An HRV has a plastic core and is used only in the cold months of the year to resolve high moisture problems in the home. An ERV has an enthalpic core (paper) and the unit can be used all year round to provide fresh air for your home.




Below are the items required when installing a gas furnace dual fuel system. The first item in a gas furnace is the size required. Gas furnaces are identified as capacity input and oil furnaces are identified for capacity output. A gas furnace at 100,000 btus can have various heating outputs from 75,000 btus to 95,000 btus depending on the efficiency. It is extremely important to size any furnace on capacity output as this is the amount of heat the furnace produces to the house. The input rating is irrelevant when selecting the proper size furnace. Furnace capacity ranges are identified from 45k, 60k, 70k, 80k, 90k, and 115k btus input for residential applications. It is extremely important to select the furnace not on this size but the output capacity. For example if your heating load as determined by our online Manual J sizing is determined to be 80k btus a furnace of 100k btus input of 100k btus and 80% AFUE will provide 80k btu output and be a perfect selection. But if you want higher efficiency then a 90k furnace at 90k btus input and 95% efficiency will have 85.5k btus output capacity. You can see that the old furnace identification of identification by input heat rating was fine when all furnaces were of the same efficiency. But this antiquated identification system needs to be discarded for the wide varieties of heating efficiencies available today. SEER - Solutions for Energy Efficient Results recommends that no furnace less than 90% efficiency should be used in any application today. 80% AFUE furnaces require expensive chimneys and waste 20% of the energy supplied up the chimney. 80% furnaces have more warranty, maintenance and service problems than the newer hi efficiency condensing furnaces because they're not made as well.

The vast majority of gas furnaces today require a closed combustion system. Most technicians and homeowners mistakenly believe fresh air intake requirements are an energy efficiency feature. However it is required for protection of the heat exchanger, not energy efficiency. A closed combustion system requires both fresh air intake and discharge through pvc or a chimney to protect the furnace. Furnaces many times are located in laundry rooms or in closed basements. Volatile emissions form fabric softener pads or soaps and chlorine bleaches will quickly destroy a heat exchanger when these product fumes come in contact with the combustion flame. To protect the furnace from these types of volatiles including nail polish remover, spray paints or other normal household cleaning agents maximum heat exchanger life is obtained when the air for combustion is taken from outside. Heat exchanger failures caused by volatiles capable of destroying stainless steel heat exchangers are not covered under any manufacturer's warranty. Further there are some home remedies for treating arthritis and other afflictions using chemicals such as DSM which is a dry cleaning fluid. When this chemical comes into contact with a flame it will permeate the metal of the heat exchanger causing a foul rotten egg like odor every time the flame is ignited. The only means of removing the odor is to replace the heat exchanger because it is embedded into the metal. To be safe always use a closed combustion system to protect your new furnace.

When installing you new furnace with a closed combustion system you will either need to make two separate wall penetrations for intake and exhaust air. Using the concentric vent kit eliminates the need for two hole penetrations allowing only one hole penetration creating a more appealing professional appearance. 



While some homeowners may find the cost of installing a concentric vent kit out of their budget the two holes can be made for a closed combustion system and then dressed up with a less expensive decorative vent termination kit. In either option both the concentric vent kit or wall termination kit are substantially more appealing and create a very professional attractive appearance. Nothing looks worse than plastic tubes with various elbow configurations extruding through exterior walls of your home.


Below are the items required for the heat pump section of the dual fuel system. The first item in a split system application is the outdoor condensing unit. Condensing units are rated in capacity and efficiency. The resulting efficiency and capacity are determined in by the correct matching indoor coil or air handler. The capacity ranges from 1.5, 2, 2.5,3,3.5,4 and 5 tons. Efficiency can range from 10 Seer to 18 Seer for cooling and 7.5 to 9.5 HSPF for heating. 15 Seer and 8.0 HSPF and higher efficiency units use 2 staging and the newer R410A refrigerants. As the efficiency and the capacity increases so does the size of the unit. Important to note the outdoor unit must be at least 18" from any walls and clear of any overhead projections for proper air movement.

A dual fuel system installed in conjunction with a furnace will need an indoor coil for the heat pump. DESCO Energy only stocks cased coils meaning there is an insulated wrapper around the coil. If your specific application is to place the coil inside the existing plenum simply remove the wrapper supplied. Removing the wrapper only takes 5 minutes. The difference in cost between a cased and uncased coil is only 4 dollars so rather than stock two different types of coils we only stock cased coils. Coil selection is based on the manufacturers specifications and not on the size of the outdoor unit. For example a high efficiency three ton outdoor unit may require using a 5 ton indoor coil. Today's higher efficiency equipment requires larger coil surfaces on both the indoor and outdoor units. Another factor affecting coil selection is the size opening of the furnace. coils need to be selected to match this size as closely as possible while still maintaining efficiency within the manufacturer's specifications. And another factor affecting coil selection is where you are located. Higher humidity climates require the smaller coils offered by the manufacturer. The smaller coil will produce colder coil temperatures resulting in better dehumidification. For the above reasons it is best to have a NATE certified technical support team member select the matching coil that is best for your specific requirements.

The next item on the list of pictures shows a light condenser pad. Pads are used in lieu of concrete pads for placement of the outdoor condensing unit. In many instances it may be easier to install a condenser pad with a 5" stone base or no base at all. Where there is a slight grade for the location of the outdoor condensing unit or movement of the soil due to heavy rains or freeze thaw conditions it is highly recommended to use a 4" concrete base with 4" stone base. Remember the outdoor unit needs to be located at least 18" from any exterior wall and free of any overhead obstructions.

Risers are required to be placed under the outdoor unit at the four corners. The purpose of the riser is to elevate the outdoor unit so that condensate can drain freely and clear of the unit. Also risers provide protection against snow accumulation. Risers should be considered essential for moisture removal in defrost cycles in every heat pump application whether or not the previous system had them. Risers come in 3,6 and 12 inch heights. Certain codes require the use of 12" risers for flood protection as well.

The next item is the refrigeration lineset that connects the refrigeration system of the heat pump together from the indoor unit to the outdoor condensing unit. Keeping this length as short as possible is important for maintaining maximum efficiency and performance. The standard linesets come in 30 and 50 foot lengths and in three different sizes. With the small line at 3/8" O.D. copper called the liquid line and the larger line called the suction line with insulation the sizes range from 3/4", 7/8" and 1-1/8" O.D. copper. Longer lengths are available.  The size of the suction line is determined by the capacity of the system as well as the length of tubing lineset involved. 3 ton and over systems use a minimum 7/8" suction tubing for 30 feet or less. For 3 ton and over with 50 ft. lengths of linesets they would use 1-1/8" suction line sizes.

If this is a replacement system and you've chosen not to replace the lineset because it is too difficult to replace a filter drier for removing harmful acids and debris and moisture must be installed. It is highly recommended to always replace the lineset when replacing any air conditioning or heat pump system so you are assured everything is clean and fresh and no residual contaminants will infect the new system. If not a suction and liquid line drier should be installed  of the type for removing acid, moisture and filtering.

For a decorative outside professional appearance a lineset thimble can be used to enhance the penetration required for the lineset. Thimbles are available in round and rectangular design.

The electrical whip and disconnect are the next items for the outdoor unit. For every outdoor unit there needs to be an electrical disconnect within sight and reach of the outdoor unit. This is required by all electrical codes in allinstallations. Most new codes require the use of an electrical disconnect with an electrical 110 volt receptacle attached and ground fault protection or GFI. Standard disconnects come with fused or non fused. It is highly recommended to follow the electrical codes in your area. If a GFI type disconnect is required this can also be handy for any service or another outside source for a plug in connection. At the very least a fused or breaker type weather proof disconnect should be used. The ampacity or size of the disconnect should be no less than that required under the HVAC manufacturer's specifications. Keep the electrical disconnect as close to the outdoor unit as possible. The electrical whip is a plastic sheathed protective tube with electrical copper wiring inside to connect electrical power from the outdoor unit to the electrical disconnect. Electrical whips come in one size and rated at 240 volts at 60 amps at 6 feet in length.


The dual fuel thermostat is the next item required. Thermostats come with many different features and programs today. The newest hi tech thermostats provide a wide array of energy saving features such as every day of the year programming with daylight savings features to monitoring hours of operation with reminders for when to change filters. By slowly raising temperatures at different time periods depending on time required, intelligent energy

 management will raise indoor temperatures according to the recovery time required.  In addition they can also control humidity for humidification while monitoring outside air conditions to prevent condensation of walls and windows. A few can actually control variable speed motors to reduce the air speed for a true dehumidification cycle while others will lower the thermostat cooling setting to provide more dehumidification. Some thermostats are internet ready where they can also be monitored or adjusted over the internet or phone or monitor conditions to send alarms. All this with many more functions or to the simplest electro mechanical thermostats are available. Remember the new two stage gas furnaces with variable speed require hi tech 2 stage thermostatic control to operate efficiently.


Outdoor thermostats are required additions to dual fuel systems to provide a changeover in accordance with the balance point. The balance point is where the heat pump capacity due to lowering of efficiency is no longer sufficient to provide the required amount of heating and the gas furnace takes over.  The balance point can be anywhere from 37 to 23 degrees outside temperature.


Electrical thermostat wire needs to be considered for wiring from the thermostat to the indoor air handler or furnace and then to the outdoor condensing unit. Remember thermostat wiring should never be installed inside conduit or plastic sheathing with power wiring. The new hi tech thermostats can require up to 8 conductors from the thermostat to the air handler or furnace while thermostat wiring from the indoor furnace to the outdoor unit will generally require no more than 3 conductors. When running thermostat wire make certain to always run one or two more leads than required for future changes or a broken wire that may occur.

Vibrations pads and corners are used when the indoor air handler or furnace needs to be mounted to raise the level of the indoor unit or to attenuate noise transmission. Corners are recommended when the air handler or furnace is placed in an upright position on a floor with central return. Vibration pads are primarily used in horizontal mounting positions of the indoor air handler or furnace to attenuate noise transmission. Either corners or vibration isolators are very inexpensive and are worthwhile investments.

For furnace installations in basements or closets in upflow applications, furnace legs make installation easier and provide protection from wet floors or water damage. Furnace legs are inexpensive and make a nice attractive installation.


Humidifiers should be considered an essential part of every dual fuel installation for comfort and energy savings. No other single item provides more benefits for such a small investment. Winter air is dry air in all parts of the country. Dry air causes drying of skin and respiratory systems. Dry air also supports viruses and related other bacterial growth. For this reason the flu and other respiratory ailments increase substantially in winter months. Dry air dries out hardwood floors and other furniture and construction materials. As well dry air increases static electricity causing computer and other electronic problems and is shocking when walking across carpeted floors. A humidifier increase indoor air quality and comfort eliminating or reducing the problems cause by dry air. A humidifier can allow you to lower the room thermostat setting 3 or 4 degrees without any noticeable comfort change. Even if a humidifier increased your health to the point you were fortunate to avoid catching the flu or a bad cold, the cost of the lost time at work for on illness more than pays for the cost of the humidifier. Add tot his the savings enjoyed from reduced energy consumption there really is no good reason not to install a humidifier with your new gas furnace. The humidifiers of today are much better than ever with low maintenance and better performance. For serious humidification consider the electric heated humidifiers and for standard humidification there is the low cost bypass and injection humidifiers. Consider a humidifier an essential part of your heating system.

Condensate traps need to be installed in the drain lines of every air conditioning system. Without the use of a trap the negative air pressure inside an air handler or the positive pressure on the coil of a furnace block the natural flow of condensate and result in overflowing of water from the coil. But condensate traps accumulate debris and need to be cleaned at least once annually and in more hot and humid climates once per month. Traps should be installed with screw type unions where they can be easily removed and cleaned. Pouring hot water down the condensate line can be somewhat effective in checking the operation of the trap. But heavy accumulation will inevitably result in build up that blocks the trap.  Being able to remove and effectively clean the trap with warm running water is the best solution. Traps and condensate lines should be a minimum of 3/4" PVC tubing. Copper and steel drain lines should be avoided as they will clog up faster and are more difficult to keep clean.

All condensing gas furnaces produce water and need to be drained to a sewer line. When a drain access is not readily available such as in a basement or first floor application the use of a condensate pump may be required. Condensate from gas furnaces is drained into the pump reservoir where a float energizes operation of the pump. The water can then be pumped to a local sewer line. Alarm contacts are also provided to deenergize the air conditioning system in the event of pump failure. 3/8" clear plastic tubing is then piped outside or to a local sewer drain. Never drain or pump water from a gas furnace outside as the acid in the water will destroy all vegetation.

The auxiliary drain pan is required when placing a condensing furnace in the horizontal position. Eventually condensate traps will clog unless someone is extremely diligent on constant maintenance. So the attitude should always be when and not if it clogs what damage will occur? In almost all instances horizontal applications are above in an attic area where a condensate trap is not easily accessed for routine maintenance and easily forgotten until they clog. By having an auxiliary drain pan the condensate then flows safely out of the coil on to the auxiliary drain pan and drains safely past the clogged trap. There are also auxiliary drain pans available for vertical or upflow applications. Clogged traps can also result in damaging expensive hardwood flooring or ceilings and floors beneath.

Another protective highly recommended device is the drain alarm. Drain alarms come in two possible applications. One such trap shown can provide an alarm as well as deenergize the air conditioning system until the trap can be safely cleaned. Another senses the accumulation of water build up in an auxiliary drain pan and provides the same protection with an alarm and deenergize the air conditioning system.



Hi efficiency condensing furnaces have special needs and consideration for air filtering. Because of the construction and operation of the furnaces any dirt entering the furnace will actually melt on to the condensing coil. This dirt can't be removed even with steam pressure. Continued build up will result in efficiency losses and premature failure of the furnace not covered under warranty. To protect your furnace and provide continued efficient operation a high media filter is strongly recommended. For proper indoor air quality the air system needs to be properly filtered either using a high media or electronic air cleaner. The high media filter is the most recommended because of higher reliability and visual evidence of proper operation. Electronic air cleaners continue to be less reliable and more expensive to maintain and purchase. Hi Media filter protection is essential to maintaining clean efficient operation of any HVAC system.

In humid climates where mold and mildew are a constant problem the use of an ultra violet lighting system needs to be considered. Ultra violet lighting systems provide the only certain method of controlling and eliminating build up of damaging and harmful fungus and mold spores on wet air conditioning coils.


Protective devices should also be considered for the longest most reliable system performance. If the air conditioning system you are selecting will be operating under unusual circumstances then a low ambient kit should be considered. Low ambient kits provide system protection and efficient operation when the outside temperature falls below 65 degrees.  This type of application occurs in restaurants, computer cooled areas and offices with high heat loads. It can also occur in residential applications where internal areas only are being cooled and the cooling is operating beyond it's design conditions. A low ambient kit cycles or varies the speed of the outdoor fan to maintain a consistent pressure in the refrigeration system essential for efficient operation and protection of the compressor.

Another protective device the hard start kit is used when there is frequent operation of the air conditioning system and/or when there are low power voltages or brown outs. Lower voltages or situations where the refrigeration pressures do not have sufficient time to properly equalize will cause the compressor motor to stall and trip on it's internal overloads creating extreme stress on the motor. Systems using TXVs should also consider the use of hard start kits where undue time is needed for the system refrigerant pressures to equalize. An example of a stalled condition imposed by people can occur by turning the thermostat setting up and down several times quickly. This will cause the compressor motor to stall and trip on it's overloads. With a hard start kit this problem is eliminated and provides extra energy to the compressor motor to overcome problems of insufficient power or rapid cycling substantially increasing compressor life.

A new protective device is also available to monitor and provide added protection to the Copeland Scroll compressors. A very important module which is only available from certain HVAC manufacturers on their highest efficiency models. At the very least the compressor monitor will reduce unnecessary compressor replacements that result from incompetent technicians and contractors misdiagnosing problems. Remember Copeland reports over 35 % of compressors returned under warranty have absolutely no defects and the other 60% are returned with defects that could have been avoided due to improper installations. How many compressors are condemned with no defects out of warranty? You can help avoid this costly mistake and problem as well as provide better compressor protection with the compressor protection module by Copeland.

For customers using propane gas you will require a propane conversion. For single stage gas furnaces this conversion is a simple change of gas orifices. For two stage furnaces the entire gas valve is changed. DESCO Energy will provide the propane conversion for you when requested. We do however advise all customers considering the use of propane gas to reconsider their energy usage. In most parts of the country excluding California the cost of propane gas is more expensive than electric resistance heating. In fact in many parts propane costs 50 to 100% more than electric heat. Ask your technical associate at DESCO Energy about less costly forms of heating. 

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