While I can set my house to be a particular temperature, I still have to manually switch it between "Heat" and "Cool" mode, and this seems to be true of every thermostat (programmable or not) that I've seen. Is there a reason for this?
Why don’t programmable thermostats automatically switch between “Cool” and “Heat”
air-conditioningcoolingheatinghvacthermostat
Best Answer
The logic involved is much more complex.
Right now the logic is simple:
But the determination of when to switch between heating and cooling modes is much more complex - otherwise the ac would kick on, and it would get too cold, so hte furnace would kick on, making it too hot, and a cycle would begin that would never end.
So the logic must be more like:
The circuitry involved is much more complex, so the price is higher and the market share obviously will be smaller.