Primary Tool
Load Estimator
Rule-of-thumb heating and cooling estimate for early-stage screening. These defaults reflect a Philadelphia-style climate assumption and should not replace project-specific load calculations.
Heuristic workflow
Use this page to bracket a likely load range, not to finalize equipment selection. Confirm with Manual J, code-required calculations, or project-specific engineering before procurement.
Modeled load by scenario
The selected scenario uses your overrides. The other bars stay anchored to the default multipliers for comparison.
Typical gas appliance input ranges
Use these as context when your estimated load needs a reality check against common equipment sizes.
Typical AFUE residential furnace input range.
Warehouse and garage suspended unit heater range.
Hydronic boiler input range.
Residential tank-style water heater.
Typical condensing tankless unit.
Restaurant and multi-use commercial service.
Gas heat section within packaged HVAC units.
Schools and small commercial buildings.
Hospitals and larger institutional plants.
Representative paint booth makeup air heater range.
Heavy industrial thermal process equipment.
Foodservice range, rough burner aggregation.
Plate size and duty cycle drive the exact number.
Representative single-vat fryer range.
Deck or stone oven depending on size.
Thermal output band for packaged CHP systems.
Thermal band for fuel-cell-based CHP systems.