What changes the estimate
Floor area is adjusted for ceiling height, climate, insulation, sun exposure, occupants, and kitchen heat. Closed-off rooms should be calculated as separate zones.
MINI-SPLIT SIZING CALCULATOR
What size mini split do you need?
Estimate the cooling capacity for one room or open zone, then compare it with common mini-split sizes.
ESTIMATED ROOM LOAD
10,000 BTU/hLikely range: 9,000–11,000 BTU/h
Nearest common size12,000 BTU/h1.00 tons of cooling
This is an early sizing estimate, not a Manual J calculation. Do not add a large “just in case” margin—oversized mini splits can short-cycle and remove less humidity.
Treat this as a shortlist, not a purchase order
When to get a load calculation
Use a qualified Manual J calculation for whole-home systems, additions, unusual glazing, vaulted spaces, multi-zone layouts, or whenever the estimate sits close to a unit-size boundary.
Common size examples
12,000 BTU/h equals 1 ton; 18,000 equals 1.5 tons; 24,000 equals 2 tons; and 36,000 equals 3 tons.