Free HVAC Size & Load Calculators
Accurately size your AC, furnace, heat pump, or mini-split. Save money on equipment and energy bills.
Explore All Calculators →Most Popular
MOST POPULAR
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BTU Calculator
Calculate exactly how many BTUs your room or home needs based on size, climate, and insulation.
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AC Unit Size Calculator
Find the right central air conditioner tonnage for your home. Avoid costly oversizing or undersizing.
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Mini Split Size Calculator
Size a ductless mini-split for any room, garage, addition, or whole home application.
Use Calculator →Why Proper HVAC Sizing Matters
✓ Save on Equipment
Oversized systems cost 20-40% more upfront
Oversized systems cost 20-40% more upfront
✓ Lower Energy Bills
Right-sized systems run at peak efficiency
Right-sized systems run at peak efficiency
✓ Better Comfort
Proper dehumidification and temperature control
Proper dehumidification and temperature control
✓ Longer Equipment Life
Avoid short-cycling that wears out compressors
Avoid short-cycling that wears out compressors