In the following video Court Airhart from Airhart Construction gives a quick overview on the heating and cooling system in your home.
Furnaces
Energy rating (ex - 9o% efficiency) is the amount of fuel used to directly heat your home.
Air Conditioners
Seer rating is the electrical usage and efficiency of the air conditioner. The higher the Seer rating the more efficient.
Humidity - Comfort level
In the dry winter a humidifier can be used to add comfort and protect wood floors, etc.
In the humid summer the air conditioner also acts as a dehumidifier.
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