Hi, I have York HVAC system and my thermostat shows R, C, A+ and B-
wires. Picture attached. Is my system compatible? I opened HVAC board
and it shows same wires and labels. If rewiring required, do you who can
come and estimate the cost first?
Thank you for your reply. I already used the compatibility checker link
and it doesn't list the wiring A+ and B- which is why I was checking
here if someone knows its compatible?