Glossary

An area, box or coil where heat flows from the warmer to the colder fluid or surface. A device for the transfer of heat energy from the source to the conveying medium.

Found in the furnace, the heat exchanger transfers heat to the surrounding air, which is then transported throughout your home.

A fuse is a type of overcurrent protection device. Its essential component is a metal wire or strip that melts when too much current flows, which breaks the circuit in which it is connected, thus protecting the circuit’s other components from damage due to excessive current.

That part of an environmental system which converts gas, oil, electricity or other fuel into heat for distribution within a structure.

Any vent or duct, pipe, or chimney for carrying exhaust gases from a fireplace, furnace, water heater, boiler, or generator to the outdoors.

Gas Appliance Manufacturers Association.

Any device that creates air currents.

The temperature scale on which water freezes at 32 degrees and boils at 212 degrees; designated by the letter F. To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit number, multiply by 5 and divide by 9 (77 32 equals 45, times 5 equals 225, divided by 9 equals 25 degrees Celsius). This is

A refrigerant-metering valve with a pressure or temperature controlled orifice.

The other half of an air conditioning system, this network of tubes filled with refrigerant which is located inside the home within the indoor unit, take heat and moisture out of indoor air as liquid refrigerant evaporates.