Jun 23, 2026 7 min read
Sizing a Mini Split for a Colorado Garage or Workshop
A 12,000 BTU mini split heats and cools a well-insulated 400 to 550 square foot garage or workshop in a Colorado climate; a garage with poor insulation, a lot of glass, or a lot of tool heat load needs less square footage per ton to stay comfortable. The right size depends on insulation, ceiling height, winter design temperature and how the space gets used, not floor area alone.12,000 BTU equals