Air conditioning (often referred to as AC, A.C., or A/C) is the process of removing heat from a confined space, thus cooling the air, and removing humidity.
These units are rated by their seasonal energy efficiency rating (known as SEER.) Thirteen SEER is the minimum allowable rating in Ontario. Units with up to 21 SEER are now available.
Upgrading an average home system from 10 SEER to 17 SEER can save you up to 40 per cent on hydro running costs.