Denver Furnace Sizing Help
Would appreciate help with a choice between an 80,000 or 100,000 Btu Bryant Evolution 987M furnace (97%AFUE)
Original furnace is a 140,000 BTU 80%.
Location is Louisville, Colorado (suburb of Denver). 1 Degree Winter Design temp.
Home was built 1991 front faces south, is 4,000 sq. ft. total 2650 on 1st/2nd floor with unfinished walkout basement.
New vinyl double pane windows/doors, R40 attic insulation, fireplace is a gas insert with outside combustion air - we've had a blower door test and sealed most of the large infiltration.
A/C is a 4 ton unit 21" plenum plan to stay with this compressor and coil
I performed a manual J, used HVAC-CALC came out to 80,000 heat loss - that includes sizing the walkout basement for heating.
The two Bryant choices net to 69,000 and 86,000 Btu respectively after altitude and efficiency corrections.
I've been reading this forum for a while now and love the content - its where I got the idea to do the manual J myself.
Thanks for the help in advance!