TWO STAGE FURNACE WIRING DIAGRAM

How to Connect the Thermostat to a Two Stage Forced Air
A two stage furnace works like this: your thermostat calls for heat and the furnace kicks on low. After a predetermined amount of time, if it has not satisfied the temperature, it kicks up to high until the temperature is satisfied. For this extra stage, you need to connect one additional wire to your furnace and your thermostat.
Is A Two Stage Furnace Worth It? – The Comfort Academy
Apr 30, 2020These motors were not new. You could buy a two stage furnace with an ECM motor for over 15 years. By far though, most two stage furnaces were sold with the older less efficient motors. But more importantly, remember this changed in 2019. And manufacturers and contractors have been pushing the “save you money” claim for over 20 years.
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