I am having this unit installed in my house tomorrow.
It is replacing a Carrier Weathermaker 8000 that has leaky heat exchange tubes.
Does anyone know if this furnace requires a two-stage thermostat?
Also, currently my furnace only has a 1" filter. If I choose to add a 4"-5" pleated filter, are there any issues I need to be aware when making this chnage to existing ductwork?
Thanks for the help.