BTU / HVAC Sizing Calculator
Calculate the BTU capacity needed for heating and cooling based on room size, insulation, climate, and windows.
Inputs
sq ft
ft
Results
Cooling BTU Needed
11,800
AC Tonnage1
Suggested AC Size1 tons
Furnace BTU12,980
BTU per Sq Ft29.5
How to Use This Calculator
- Enter the Room Area (sq ft) and Ceiling Height (ft).
- Select Insulation Quality (Poor, Average, Good, or Excellent) for the space.
- Choose the Climate Zone that matches your location.
- Review the recommended BTU capacity for both heating and cooling.
- Use the output to select the right window AC, mini-split, or furnace for the room.
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