How many BTU for a 1,500 sq ft house?
Rough planning totals often land at 24,000–36,000 BTU depending on layout, insulation, and climate — usually split across zones or a 2–3 ton central system. Add each room here for a better estimate.
Whole House BTU Calculator
Whole-house sizing is not one rule-of-thumb multiplier — add each major zone (living, kitchen, bedrooms) as separate spaces and total the load. Use results for planning; licensed pros run Manual J for permits.
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Related guides
Frequently asked questions
One mini-split vs central AC for whole house?
Multi-zone mini-splits or a central ducted system both work. This calculator totals BTU — your installer maps that to equipment zones and duct design.
Should I include the kitchen in whole-house BTU?
Yes. Kitchens add heat from appliances and occupants. Enable kitchen load when the open living area includes cooking space.
Related calculators
HVAC Calculators · https://hvaccalculators.net/whole-house-btu-calculator/