Glossary of Terms

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Recycling: Removing, cleaning, and reusing refrigerant in an HVAC system.

Refrigerant: A chemical that produces a cooling effect while expanding or vaporizing. Most HVAC systems use either R-22 or R-410a refrigerant.

Refrigerant Lines: Two copper lines that connect the condenser to the evaporator on an HVAC system. These are the lines the refrigerant travels in the HVAC system.

Return: The input source of a heating or cooling system

Scroll Compressor: A type of compressor used in air conditioners and heat pumps that compresses refrigerant by working in a circular motion.

SEER: The Seasonal Energy Efficiency Ratio is an energy efficiency rating for air source air conditioners. The SEER rating is the BTU output during a typical cooling season divided by the total electric energy input in watt-hours during the same period. The higher the SEER number, the more efficient the system is at converting electricity into cooling power. The DOE’s established minimum SEER rating for cooling is 13.0.

Setback Thermostat: See Programmable Thermostat

Single Package Product: A heating and cooling system combined in one outdoor unit.

Split System: Refers to an air conditioner or heat pump that has components in two locations. Usually, one part of the system is located inside (evaporator coil) and the other is located outside the building or home (condenser coil). In geothermal systems, both units will likely be located inside the home – just in different location. Split systems should be matched for optimum performance and efficiency.

Supplemental Heating: A heating system used during extremely cold weather, when additional heat is needed to moderate indoor temperatures. May be in the form of a fossil fuel or electric resistance. Commonly found on air source and some geothermal heat pump systems.

Supply: The output source of a heating or cooling system.