What size system do you actually need?
Punch in your sq-ft, climate zone, and insulation era for a ballpark BTU/h and AC tonnage range. Bring it to your next bid as a sanity check — real sizing requires an on-site Manual J.
What size system do you actually need?
"You need a 3-ton AC" is something every contractor will tell you — and most of them are guessing from a sticky note. Punch in your real numbers below for a ballpark BTU/h range we can sanity-check against your bid. Then bring it to the load-calc appointment.
Heads up: this is an estimate, not a load calc. Real sizing requires a Manual J on-site analysis — windows, orientation, duct losses, infiltration — none of which a calculator can know about your house. See our Terms §3.
Climate zone (Wisconsin)
Insulation era
Heating BTU/h
68–83k
Furnace input rating
AC tonnage
4.5 tons
Cool: 48–58k BTU/h
Educational only. Sources: ACCA Manual J defaults, SE Wisconsin climate baseline. Placement: sizing-landing.
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