How to Choose the Right Mini-Split System for Your Space
From BTU sizing and zone count to SEER2 efficiency and smart features — everything you need to pick the perfect system with confidence.
Browse All Systems »Step 1: Choose the Right BTU for Your Room
BTU is how much heating or cooling capacity a system has. Too small and it runs nonstop; too large and it short-cycles and leaves humidity behind.
| Room Size | BTU Needed | Typical Use |
|---|---|---|
| 250-400 sq ft | 9,000 BTU | Bedroom, office |
| 400-600 sq ft | 12,000 BTU | Living room, studio |
| 600-1,000 sq ft | 18,000 BTU | Open living areas |
| 1,000+ sq ft | 24,000 BTU+ | Large rooms, light commercial |
Step 2: Single-Zone or Multi-Zone?
Single-Zone
One outdoor unit, one indoor head. Perfect for a bedroom, garage, addition, or home office.
Shop single-zone »Multi-Zone
One outdoor unit powers several indoor heads. Each room gets its own thermostat and settings.
Shop multi-zone »Step 3: Factor in Insulation and Sun Exposure
A lot of direct sunlight, poor insulation, or high ceilings means you should size up. When in doubt, use our free load calculator for a precise recommendation based on your actual space.
Step 4: Check the SEER2 Rating
Higher SEER2 = lower monthly bills. For most homes, 18+ SEER2 is the sweet spot. If you run the system heavily, spending up for 22-26 SEER2 pays back fast in energy savings. See our SEER2 guide.
Step 5: Smart Features Worth Looking For
Adjust temperature from your phone, anywhere.
Critical for humid climates. Removes moisture without overcooling.
Quieter at night, saves energy while you sleep.
Resumes last settings after a power outage automatically.
Popular Systems by Use Case
12,000 BTU - 115V
17 SEER2 - plug into a standard circuit. Bedrooms, offices, small rooms.
View system »18,000 BTU - 24 SEER2
ENERGY STAR - larger rooms, high-efficiency long-term savings.
View system »Multi-Zone Condensers
One outdoor unit for 2-5 rooms. Independent control per zone.
Browse multi-zone »Still Not Sure? We'll Help You Pick.
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