I had original equipment multistage thermostat subbase model
Q674b 1034 (8948)
and need to replace this item.
I have found many replacements but the number in the parentheses is always different. The model I am considering is (9929)- the heat off cool and auto on switches are the same.
My question is :
what is the significance of the 4 digit number in parentheses after the Q674B 1034?
Thank you kindly,