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Turbo6bar, didn't read your setback tstat part... yeah turning your a/c back a little won't hurt, but I was refering to folks that turn their a/c's off and close up the house...... The difference being OFF.... If you turn your A/C up to 84 while at work and have it drop to 76 or 78 an hour before you get home, well thats fine because there is not that much of a temperature spread.... but one thing to remember with a/c's is that you are not just cooling the air, you are exchanging heat, which means you are not only pulling the heat out of the air, but all the walls, furniture, appliances, etc..... which in itself is not an instant process...
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