Keep the inputs with the result
Record the conditioned area, ceiling height, insulation choice, system type and zones you entered so the review starts with the same assumptions.
Heating and cooling planning
HVAC Sizing Calculator: Start Your Comfort Plan
Compare the home and system assumptions in the calculator, then bring the result to a heating and cooling review.
Use the calculator
JavaScript runs this calculator. Send your measurements for a project review.
How should you use the result?
Plan the load calculation
ACCA Manual J addresses residential heating and cooling loads. The measured building envelope, windows, orientation and local design conditions inform that calculation.
Connect equipment and ducts
Equipment selection follows the load and manufacturer performance data. Duct sizing and distribution are coordinated with the selected system.
Describe the comfort problem
Show rooms that heat or cool unevenly, the existing equipment and any planned insulation or window changes.
What should the project review cover?
Existing equipment and access
Share equipment labels, filter locations, attic or crawl-space access and the areas served by each system.
Ductwork and controls
Identify reused ducts, changes in airflow distribution, thermostat positions and any zoning work.
Permit and electrical coordination
Include the permit path, equipment connections and the electrical work associated with the selected replacement.
Installation and handover
Compare removal, installation, startup, controls and maintenance information in the proposal. Your price depends on the complete scope.
Residential design resources
Bring your result into the project
Save the calculator result and the assumptions you entered. Add room photos and the problems you want to solve.