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Home Heat Load Estimator

Manual J style design heat load from area and loss rate.

Inputs

Inputs and assumptions

Conditioned floor area. (1 sq ft = 0.093 sq m).

25 tight/new, 30 average, 45+ leaky/old home. Block-load screening only, not an ACCA Manual J room-by-room calculation.

Result

Design heat load (BTU/hr)
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In tons
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What to check

  • Conditioned floor area
  • Insulation and air leakage level

Related calculators

Rule-of-thumb screening estimate, not an ACCA Manual J calculation. Confirm with a room-by-room Manual J load calculation and installer quotes before buying equipment.

Saved calculations

Keep the assumptions with the result.

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