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Mini-Split Size Calculator

Ductless mini-split total and per-zone BTU from area and zone count.

Inputs

Inputs and assumptions

Total area served.

20 average, 25 hot/sunny.

Number of indoor heads. Multi-zone outdoor units derate combined capacity; confirm against the spec sheet.

Result

Per zone (BTU/hr)
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Total capacity (BTU/hr)
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What to check

  • Area served
  • Number of indoor heads

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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