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Heating Load and Output Capacity Comparison

Compare a documented design heating load with actual equipment output at the same relevant design conditions, retaining the source for both.

Use this result well

Inputs that matter
Documented design heating load (Btu/h), Equipment output at design conditions (Btu/h), Sources and assumptions
Output to expect
Heating load and capacity comparison
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Heating load and capacity comparison

Compare a documented design heating load with equipment output at the same design conditions. Enter delivered heating capacity, not furnace fuel input. A heat pump’s output must come from performance data at the relevant outdoor and indoor conditions, including the designer’s treatment of defrost and backup heat.

Capacity difference = documented equipment output − design heating load; load coverage = output ÷ load × 100.

Updated: September 2026

Example Scenarios

The built-in example uses fictional planning records. Replace these with your own verified details.

→ -4,000 Btu/h difference

FAQ

No. Obtain the building-specific design load and applicable output data. This comparison does not infer a load from floor area, treat fuel input as output or select equipment by itself.

Use your own records on the units and period shown. Verify current requirements, enter explicit zeros for absent amounts where requested and retain dated sources.

Choose Save planning case for local history. Copy MD includes current inputs, notes and interpretation; Download CSV exports the result breakdown. Keep a portable copy separately.

About Heating Load and Output Capacity Comparison

Compare a documented design heating load with equipment output at the same design conditions. Enter delivered heating capacity, not furnace fuel input. A heat pump’s output must come from performance data at the relevant outdoor and indoor conditions, including the designer’s treatment of defrost and backup heat.