What size mini split do I need? BTU by room, verified
A 450 ft² room in climate zone 5 needs about 13,000 BTU of heat on a winter design day. How to size a mini split by load factors, the calculator, and cold math.
verified Aug 2026 · 13 minGuides
Long-form buying research, organized by the questions buyers actually ask. Every figure is verified against source documents and dated.