Mini-split sizing calculator

Estimate a single-zone capacity range from room size, climate, and common load factors.

Room inputs

This is a screening estimate only and does not replace an ACCA Manual J load calculation.

ZIP codeFive digits used for climate design temperatures.Room areaFinished floor area in square feet.Ceiling heightAverage finished ceiling height in feet.InsulationBest estimate for the room envelope.Exterior wallsWalls exposed to outdoors or unconditioned space.WindowsCount windows inside this zone.Window qualityTypical glazing for the room.Sun exposureTypical afternoon solar load.Room typeRoom type affects internal and envelope loads.OccupancyTypical number of people in the zone.Heat-producing equipmentComputers, cooking, or other steady internal heat.Primary useMain load the system must satisfy.Floor planOpen rooms share load less predictably.

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