HVAC BTU Sizing Calculator

Calculate HVAC BTU requirements. Size air conditioning and heating systems for optimal efficiency.

Properly sized HVAC systems run more efficiently and effectively. This calculator estimates BTU requirements based on room size and factors affecting heating and cooling needs.

Calculator

Recommended BTU
0 BTU
Cooling Capacity (kW)
0.0 kW
Tonnage
0.00 tons
Next Standard Size
0 BTU

Common use cases

  • AC purchase sizing
  • Heater sizing
  • Energy efficiency planning
  • Room comfort optimization

How to use

  1. Enter room area in square feet
  2. Input ceiling height
  3. Add number of windows and occupants
  4. Select your climate zone

FAQ

What happens if AC is oversized?

Oversized units cycle frequently, waste energy, and don't dehumidify properly. Proper sizing is important.

Should I round up or down?

Generally round up to the next standard size, but not excessively. Slightly larger is better than undersized.

What other factors matter?

Insulation quality, sun exposure, heat-generating appliances, and ductwork efficiency also affect needs.

This calculator provides illustrative estimates for planning purposes only and does not constitute financial, tax, or legal advice.