There aren t many disadvantages to a multi staged furnace compared to a single stage but the most apparent one is the added cost.
2 stage furnace disadvantages.
You could buy a two stage furnace with an ecm motor for over 15 years.
Higher upfront costs two stage furnaces are more expensive to buy than single stage models.
By far though most two stage furnaces were sold with the older less efficient motors.
These motors were not new.
It s a fairly simple concept when the furnace needs to come on it can heat at a minimum of two different levels.
You ll save on monthly heating bills but unless you live in a cold climate you might not recoup your investment as fast as you hope.
Multiple heat outputs middle setting runs longer allowing for more even heat distribution regulates mild and colder temperatures lower energy consumption.