Where I’m at, the temps flip-flop day to day, even hour to hour. In the morning it’s 35° outside, and by evening it’s 79°. I gave up keeping up with the temps and shut my unit off for the time being.
My question is why can’t HVAC units be programmed to say that if the outside temp reaches n° and the inside temp reaches m° cold, turn on the heat; conversely, if the outside temp rises to n° and the inside temp reaches m°, then turn on the AC?
My thermostat already knows the outside and inside temp, but I still have to manually switch it back and forth. I want a system that I can just set it and forget it all year round.
Most thermostats do not have an external thermometer or internet connection.
They achieve comfort by setting a desired min/max temperature that ignores outside temp because that has nothing to do with indoor comfort.
I have an Ecobee that is set to heat to 68°F and cool to 78°F in the daytime. The only time I care about the outside temperature is when I could open a window to save money.