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 cooling is not one multiplier — add each major zone as a separate space and total the load. Use results for planning; licensed pros run Manual J for permits and equipment selection.
Space dimensions
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Sizing settings
Multi-zone planning
Open kitchen-living areas may share one zone; closed bedrooms usually need their own heads or ducts. Our open floor plan sizing guide explains single-head limits.
Rough planning for a 1,500 sq ft home often lands at 24,000–36,000 BTU total — split across zones or a 2–3 ton central system.
When to hire a pro
This tool totals DIY estimates. Permits, duct design, and refrigerant work require licensed HVAC contractors and formal load calculations.
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/