The amount of heat a given quantity of refrigerant will absorb in changing from a liquid to a vapor at a given evaporating pressure.

The rate at which refrigerant is moving at a given point in a system, usually given in feet per minute (FPM).

Air which contains no moisture vapor.

An arbitrary concept which combines into a single value the effect of temperature, humidity, and air movement as sensed by the human body.

You might see this rating if you are looking at an oil furnace. In addition to input and output, an oil furnace also has a rating of gallons per hour, the volume of oil a furnace is capable of burning [..]

Name given to the end connections on pre-charged lines which screw on to mated fittings of the outdoor and indoor sections. Tightening the quick connections ruptures the seals on the fittings and the [..]

The substance, usually air or water, to which the heat in a condenser is transferred.

That length of straight tubing, which has the same pressure drop as the fitting, valve or accessory (of the same nominal size) being considered.

Instantaneous evaporation of some liquid refrigerant at the metering device due to pressure drop, which cools the remaining liquid refrigerant to, desired evaporation temperature.

Components, which are inserted into the air distribution system and designed to reduce airborne noise, which is propagated along the ducts.