Two stage heat/cool, meaning it has two output levels. A two stage
furnace that's rated at 100,000 BTU would have that as the second
stage and fire at about 70,000 for first stage. The main
advantage being that by firing at the lower rate on days when
you don't need much heat, it runs longer giving the system
more time to move air around and even out the heating.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.