BTU Needed for a Garage
How many BTU does a garage need? Estimate the AC size for this room type with sun, insulation and climate adjustments.
Runs locally in your browser — no upload, no trackingTry: Room area=400, Ceiling height=8, People usually in room=1, Room type=garage, Sun exposure=avg, Insulation quality=avg, Climate zone (1–5)=3 → 8,000 BTU, 0.67 ton, 8,000 BTU window unit, 14,000 BTU
How to use
Garages are rarely conditioned, but if you cool one for a workshop or gym, count poor insulation and leaky doors. A portable or through-the-wall unit is the practical choice. The calculator pre-fills the room type so the right adjustment (for example the +4,000 BTU kitchen load) is already applied. Change area, ceiling, sun and climate to match your space.
FAQ
How many BTU do I need for a garage?
It depends on the room's square feet and conditions, but a garage typically needs the base 20 BTU per square foot plus type-specific loads. Garages are rarely conditioned, but if you cool one for a workshop or gym, count poor insulation and leaky doors. A portable or through-the-wall unit is the practical choice.