How big AC and furnace do I need?
Utah-specific Manual J approximation with elevation derate. Move the sliders to see a defensible ballpark before you talk to any contractor.
Provo ~4,550 · Sandy ~4,800 · Park City ~7,000
How this is calculated
We start with a baseline of 25 BTU/hr per square foot for cooling and 35 BTU/hr per square foot for heating on the Wasatch Front, then apply multipliers for insulation quality, sun exposure, and ceiling volume. The result is elevation-derated using NEC and ACCA conventions: AC capacity declines roughly 1% per 1,000 ft of elevation, and a gas furnace's nameplate input must scale up about 4% per 1,000 ft above 2,000 ft to deliver the same usable BTU.
This is a defensible ballpark, not a substitute for an in-home Manual J calculation. A real Manual J measures every room and window individually and is what we use for any actual install quote.