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Steady Heating Loss Components Calculator

Total entered assembly heat losses, sensible outdoor-air loss and explicit additional loads for a documented heating subtotal.

Use this result well

Inputs that matter
Heat-transfer components, Outdoor-air volume flow (CFM), Sensible air coefficient (Btu/h per CFM per °F), Air temperature difference (°F), and 2 more
Output to expect
Steady heating loss components
  • 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

Steady heating loss components

Add entered steady heat-transfer components and sensible outdoor-air heat loss. Each component needs its net area, whole-assembly U-factor and relevant temperature difference. Use a documented air-volume flow and heat coefficient; no floor-to-wall ratio, insulation default or air-leakage rate is inferred. This is a partial heating worksheet, not a complete load design.

Conduction = sum(U × net area × temperature difference); air loss = entered CFM × entered sensible coefficient × air temperature difference; subtotal = conduction + air loss + additional entered losses.

Updated: September 2026

Example Scenarios

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

→ 9,770 Btu/h entered subtotal

FAQ

No. It totals the entered components only. Use net assembly areas, whole-assembly U-values, actual design temperatures and documented air assumptions. It does not replace the applicable complete design method.

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 Steady Heating Loss Components Calculator

Add entered steady heat-transfer components and sensible outdoor-air heat loss. Each component needs its net area, whole-assembly U-factor and relevant temperature difference. Use a documented air-volume flow and heat coefficient; no floor-to-wall ratio, insulation default or air-leakage rate is inferred. This is a partial heating worksheet, not a complete load design.