Mini Split for a 20x20 Room: Size & Systems
A 20x20 room is 400 sq ft. At 20 BTU per square foot that is a 8,000 BTU cooling load, putting it in the 9,000 BTU class before adjustments. Our dataset holds 2 verified system(s) here, 2 with first-hand prices from $799.99 to $1,598; the cheapest is the Senville LETO 9k.
Computed from our dataset
- 2 system(s) from our verified dataset appear on this page.
- Price range: $799.99 to $1,598 (verified 2026-11-04).
- Cheapest: Senville LETO 9k at $799.99 (Senville).
- Highest SEER2: Senville LETO 9k at 21.2 SEER2.
- Best heating rating: Friedrich Floating Air Pro 9k, rated to -4°F.
| System | Zones | BTU | Coverage | SEER2 | Heats to | Install | Price | |
|---|---|---|---|---|---|---|---|---|
| Senville LETO 9k SENL-09CD/220 | 1 | 9,000 | — | 21.2 | 5°F | Pro / flare | $799.99 at Senville | Check price |
| Friedrich Floating Air Pro 9k FPHW091C | 1 | 9,000 | up to 400 sq ft | — | -4°F | Pro / flare | $1,598 at Sylvane | Check price |
Buying notes
- Measure the room, not the floor plan: open doorways to other spaces add their load to this room's system.
- For a bedroom this size, the smaller class with a longer runtime usually sleeps better than a big unit cycling.