HVAC Engineer LabClarity in every calculation.
Built for building professionals

HVAC load calculations,
clearly explained.

Understand what drives your building’s heating and cooling needs. Estimate peak loads, review the assumptions, and take a clear report into your next project discussion.

Open load planner Explore tools

No account required US & metric units

Behind every loadFIG. 01
A building and the factors that affect its HVAC loadAn architectural illustration showing solar heat, the building envelope, and outdoor airflow. This is a conceptual diagram, not a calculated result.BUILDING ENVELOPEOUTDOOR AIRSOLAR HEAT
CoolingHeatingConceptual illustration
01 /

Know what’s in the number.

See the inputs, assumptions, and sources behind your estimate.

02 /

Keep your project with you.

Save in your browser. Export a project file to keep or share.

03 /

Make the result useful.

Review the load breakdown and print a report for your records.

The engineering workbench
Browse tools
Available tool · Engineering Mode

Cooling & Heating
Load Planner

Build a peak-load estimate from your building envelope, solar exposure, internal gains, ventilation, and infiltration.

Start a calculation
From inputs to insight
  1. 01
    Describe your building

    Enter design conditions and building details.

  2. 02
    Understand your load

    Review heating, cooling, and the contributing factors.

  3. 03
    Save your work

    Keep the project file and print your report.