yeah, as expectedsickcars wrote: ↑Jan 12th, 2018 8:27 amYes and you are correct with that thought. I know for sure our vents going to the 2nd floor are smaller more restricted square type duct work which for sure is an issue. I have actually thought about it and adding an exhaust & intake going to our 2nd floor using normal sized ducts would defiantly be a benefit however the issue is that our home is all finished & opening the walls and making a mess does not really work.
Going smaller won't work if you house needs 80K of heat. Thats why i suggest a load analysis, but dual stage and variable won't help, if your house needs more heat the furnace will try to provide it and your vent restrictions will again cause it to overheat. All that said if you only need 40K or 60K then smaller may be the answer and the vents may be enough to squeak by.However I think going down to a 60,000 btu dual stage & Variable motor would help and probably solve my issues based on what a few HVAC techs have told me & 2 of those techs are good friends of mine. However a 40,000btu could also be considered & may work.