The good news is these new standards required a 46 watt reduction over the older style motors.
2 stage furnace disadvantages.
Higher upfront costs two stage furnaces are more expensive to buy than single stage models.
There aren t many disadvantages to a multi staged furnace compared to a single stage but the most apparent one is the added cost.
You could buy a two stage furnace with an ecm motor for over 15 years.
This is the primary reason the 2 stage gas furnace was developed so the furnace that you could have heating your home is closer to the correct size more times than not.
These motors were not new.
Sure it will carry a higher sticker price but don t let that be the factor deters you from purchasing.
By far though most two stage furnaces were sold with the older less efficient motors.