| Central air conditioning runs the air throughout
the entire house with the actual unit located outside. A thermostat
controls the temperatures of the house. Older thermostats need
to be changed manually to the desired temperature. Newer thermostats
are programmable. Temperature settings can be programmed to change
at certain times of the day. This can help lower electric bills
by allowing the house to be warmer when the house is empty. Running
central air conditioning uses a lot of electricity but it is generally
more energy efficient than window air conditioning. Many older
homes use either window units or have no air conditioning at all.
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