Insulation & windows
Heat gain changes with glass area, orientation and insulation.
Planning before installation
HVAC comfort calculator
Estimate a starting capacity range, then schedule a professional evaluation for equipment selection.
Comfort planning tool
Quick BTU estimator
This is a preliminary planning estimate—not a substitute for a Manual J load calculation.
Enter the room dimensions to see an estimate.
AMB Premium
What affects the final system size?
Correct sizing depends on more than square footage.
Occupancy & equipment
People, lighting and appliances add heat.
Airflow & ductwork
Available airflow and duct condition affect delivered comfort.