do you need HVAC certification to purchase product?
i am looking at the5 head unit is there a limit on the total length of line set that can be used
what is the length of the warranty?
Do you require HVAC tech license to purchase furnace
how do you change the battery
Do u sell 10 in . Or also 12 in. Height duct work thanks
I have a 30’ x 40’ metal building how invasive are the holes necessary to connect.