How can I tell if I have a 1 or 2 stage furnace?
We just bought a place where the previous owner passed away so no help there. The old thermostat (mechanical repl. with electronic) had the W2 wire hooked up but it doesn't seem to be hooked up in the air handler.
As an added bonus, it's not marked on the information sticker what heater is installed in the handler
Thanks in advance