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Browse all calculators, region presets, equipment guides, and policy pages on HowManyBTUs.com.
On this page: Calculators · Regional presets · Equipment & resources · About & policies
Calculators (13)
Cooling & heating sizing
- BTU Calculator (quick) — fast estimate by room size
- Advanced BTU Calculator — detailed load with climate zone, insulation, windows, ducts
- AC Size Calculator — BTUs to tons for central AC
- Mini Split Calculator — single and multi-zone ductless sizing
- Window AC Calculator — room-by-room window unit BTUs
- Portable AC Calculator — SACC-adjusted portable AC sizing
- Heat Pump Calculator — year-round heating + cooling sizing
- Furnace Size Calculator — BTU output by square footage and climate
- Space Heater Calculator — wattage and BTUs for supplemental heating
Comfort, efficiency & costs
- Dehumidifier Calculator — pint capacity by room size and dampness
- SEER Savings Calculator — compare efficiency ratings and payback
- Energy Cost Calculator — monthly HVAC operating cost by fuel type
- Ceiling Fan Calculator — blade span, CFM, and downrod by room
- Air Filter Size Calculator — filter dimensions, MERV, and replacement schedule
BTU calculator by region (5)
These pages pre-set climate zones, insulation defaults, and units for your area. You can still adjust all inputs inside the calculator.
United States
- Texas — Zone 2, cooling-focused, SEER2 14.3 minimum
- Florida — Zone 1, humidity and dehumidification guidance
- California — Zone 3, coast vs inland vs desert, Title 24
Canada
- Canada (all provinces) — Zone 6, Canadian building codes, kW conversions
- Ontario — Zone 6, SB-12 insulation, Ontario-specific tips
Equipment & resources
- Heating & Cooling Equipment by BTU Range — shop window ACs, mini splits, heat pumps, space heaters, fans, filters, and more