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Cold air is heavier, as it gets warmer it will go up. If you turn on the thermostat on the second floor the air will come down and then go up as it gets warmer, making the air circulate. When the weather is very hot use both AC units (upstairs and downstairs), but if the weather is not so hot rest one unit and you will prolong it's life.

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โˆ™ 2005-09-20 01:51:15
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Q: If you have a two-story house and no one stays upstairs can you simply turn the AC off and only leave the downstairs AC running?
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