Glossary of Terms

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Modulating System: A forced air or boiler type of equipment that has multiple BTU output capacities instead of one fixed or two staged output. Often found on boilers, indirect water heaters, ductless split A/C and heat pump systems, and some furnaces.

Odors/Chemicals: Air contaminants in the form of gases.

Open Loop Heat Pump System: A geothermal heat pump system that uses groundwater from a well or surface water from a lake, pond, or river as a heat source. The water is returned to the environment.

Operating Cost: The day-to-day cost of running your HVAC system based on energy use.

Particles: Any substance measuring less than 100 microns in diameter. The EPA has found that small particles (less than 2.5 microns) are responsible for the health effects of greatest concern.

Payback Analysis: Overall measure of the efficiency and value of your home’s HVAC system. By combining your purchase price and on-going operating costs, a payback analysis determines the number of years required before monthly energy savings offset the purchase price.

Programmable Thermostat: A thermostat with the ability to record different temperature settings/time settings for your heating and/or cooling equipment.

R-410a Refrigerant: R-410a refrigerant (sometimes called Puron) is a chlorine-free refrigerant used in residential and commercial HVAC equipment that meets the EPA’s most stringent environmental guidelines. R-410a is an HFC refrigerant that does not harm the earth’s ozone layer. R-410a refrigerant is being used as the replacement for R-22 (Freon) refrigerant.

R-22 Refrigerant: R-22 (Freon) is a single component HCFC refrigerant used in residential and commercial HVAC systems. Production of R-22 will cease in 2015 per the Montreal Protocol.

Reciprocating Compressor: A type of compressor used in air conditioners and heat pumps that compresses refrigerant by using a type of “piston” action.

Reclaiming: Returning used refrigerant to the manufacturer for disposal or reuse.