Air conditioning controls the temperature of homes, offices and other indoor areas. Although primarily thought of as a way of cooling, air conditioning units can also heat rooms and help remove extra moisture from the air. Using an air conditioner has become one of the most popular, and environmentally friendly, ways to heat conservatories and extensions.

Air conditioning systems operate by taking advantage of the fact that when a liquid converts into a gas form, it absorbs heat. An air conditioner draws ambient indoor air in and across a set of refrigerant-filled evaporator coils.

How do I choose which BTU air conditioner?