Mini-Split Load / Sizing Calculator

Estimate the cooling/heating capacity (BTUs) you need for a room, adjusted for the factors that actually move the number.

Room size (square feet)

Ceiling height

Sun exposure

Climate

People (regularly)

Recommended capacity

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How to use it: This gives a solid starting estimate based on ~20 BTU per sq ft with real-world adjustments. For a precise figure on a whole-home or multi-zone job, a full Manual J load calculation is the professional standard. Don't oversize — a unit that's too big short-cycles, wastes energy, and leaves humidity behind.