Building Information

Estimated HVAC Loads

Cooling Load
—
BTU/h

Heating Load
—
BTU/h

AC Size

—

tons

Heat Pump

—

BTU/h

What is Manual J?

ACCA Manual J is the industry-standard method for calculating residential heating and cooling loads. This free calculator provides quick estimates based on building size, climate zone, and construction type.

How It Works

1 Enter your building square footage and ceiling height

2 Select your climate zone (based on outdoor design temperatures)

3 Choose your building type (insulation efficiency)

4 Get instant BTU load estimates for cooling and heating

Note: This provides estimates for budgeting and rough sizing. For exact equipment selection, use full Manual J (8th edition) procedures. Consult a licensed HVAC professional for final system sizing.