2-speed vs. variable-speed furnace blower
I’m about to order a replacement 40,000 BTU gas furnace for my house in Traverse City, MI, CZ6. It will have a 2 stage burner with an AFUE of 96%. It is available with a 2 speed ECM blower and one with that is continuously variable.
The house is 900 sq. ft. It has R10 basement walls, R20 walls and R50 ceiling.
What difference does a variable speed fan make, and is it worth $200?