Quote:
Originally Posted by retiredguy123
I don't disagree with your technical method. But, my thermostat is always set on 78 degrees and, on some days, the outside temperature has exceeded 100 degrees, with no increase in the inside temperature. So, my system is able to maintain at least a 22 degree difference between the outside and inside temperatures. I have several outside and inside thermometers, so I know this is correct. I have not tested it to see if I can lower the thermostat setting and achieve a lower inside temperature. I don't know what other variables I would need to consider.
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That's fine. As I mentioned, the A/C can only reduce the temperature of the RETURN AIR, not the outside air, 20 degrees. And you measure this by taking a temperature reading at the return duct at the air handler and another reading at the output of the air handler at the duct right above it. You should see a maximun of about 20 degrees. Regardless of the outside air temperature, whatever the air temperature inside your home shoud be the reading you get at the return duct at the air handler. This is why you should never turn off or significantly lower your A/C on very hot days. If you do this it will take a very long time for your A/C to bring down the temperature in the house.