// cooling load estimator

AC tonnage calculator

Estimate the air conditioner size you need from floor area, climate, ceiling height, sun exposure, and household details — a quick rule-of-thumb sizing, not a substitute for a Manual J load calc.

Uses a common climate-zone BTU-per-square-foot rule of thumb, adjusted for ceiling height, sun exposure, occupancy, and kitchen load. Actual sizing depends on insulation, window area, air leakage, and local design temperatures — a licensed HVAC contractor's Manual J calculation is the reliable standard.