Sizing & scenarios
1.5 ton mini split: 18,000 BTU/h, the room it actually fits
A 1.5 ton mini split is an 18,000 BTU/h unit. ENERGY STAR puts that at 700 to 1,000 sq ft, makers say 500 to 900, and one unit heats 12,800 BTU/h at 5°F.
Blog
Field notes between guide updates: warranty changes, price moves, and things we got wrong. Same verification rules, lighter reads.
Cold-climate performance
Dual fuel system heat pump: when a mini split needs backup
A dual fuel system heat pump pairs a heat pump with a gas or oil furnace and hands off in the cold, conventionally at 35°F to 40°F. When it fits a mini split.
Sizing & scenarios
How does a mini split heat pump work? Heat, cold, inverter
How does a mini split heat pump work? It moves heat instead of making it. A rated 18,000 BTU/h unit still delivers 12,800 BTU/h at 5°F, and here is why.