A 36K BTU mini split is designed for very large single spaces up to approximately 1,550 sq. ft., including open-plan living areas, large garages, workshops and basements. This MRCOOL® DIY® 5th Gen 230V system provides powerful, energy-efficient heating and cooling with a pre-charged Quick Connect® line set for simpler installation. Actual sizing depends on your climate, insulation and layout—view our BTU sizing guide if you are unsure.