BTU Per Square Foot Chart for Mini Splits
The whole sizing method on one page: the BTU-per-square-foot chart, plus every verified system in our dataset so the classes have prices and heating ratings attached. Our dataset holds 43 verified system(s) here, 38 with first-hand prices from $659 to $6,860.25; the cheapest is the Klimaire KSIE 12k, and 8 of them are true DIY (pre-charged line sets).
Computed from our dataset
- 43 system(s) from our verified dataset appear on this page; 38 carry a verified USD price.
- Price range: $659 to $6,860.25 (verified 2026-11-04).
- Cheapest: Klimaire KSIE 12k at $659 (Heat & Cool).
- Highest SEER2: Senville AURA 12k at 25.4 SEER2.
- Best heating rating: Senville AURA 12k, rated to -22°F.
- True DIY in this list: 8 system(s) with factory pre-charged line sets.
| System | Zones | BTU | Coverage | SEER2 | Heats to | Install | Price | |
|---|---|---|---|---|---|---|---|---|
| Klimaire KSIE 12k KSIE012-H120-O / KSIE012-H120-IW-2 | 1 | 12,000 | 550 sq ft | — | 5°F | Pro / flare | $659$969 at Heat & Cool | Check price |
| Cooper & Hunter MIA 12k CH-RLS12MIA-230VI / CH-RLS12MIA-230VO | 1 | 12,000 | up to ~550 sq ft | 21.3 | 5°F | Pro / flare | $729.57$860.89 at MiniSplitsForLess | Check price |
| Senville LETO 9k SENL-09CD/220 | 1 | 9,000 | — | 21.2 | 5°F | Pro / flare | $799.99 at Senville | Check price |
| Senville LETO 12k SENL-12CD | 1 | 12,000 | 450-750 sq ft | 21.2 | 5°F | Pro / flare | $799.99 at Senville | Check price |
| TOSOT Cosmo 12k Cosmo 12k (230V) | 1 | 12,000 | 650 sq ft | 19 | -13°F | Pro / flare | $809.99 at TOSOT Direct | Check price |
| Pioneer Diamante Pro 12k WYT012ALSI20RL | 1 | 12,000 | 350-500 sq ft | 20 | -4°F | Pro / flare | $928$1,329 at Pioneer Mini Split | Check price |
| LG Standard 12k KSSAE121A | 1 | 12,000 | up to 550 sq ft | 18 | — | Pro / flare | $929 at HVACDirect | Check price at HVACDirect |
| MRCOOL Advantage 5th Gen 12k (pro install) A-12-HP-115D-O | 1 | 12,000 | up to 550 sq ft | 21.2 | 5°F | Pro / flare | $937 at HVACDirect | Check price at HVACDirect |
| Senville LETO 18k SENL-18CD | 1 | 18,000 | 700-1,000 sq ft | 19.2 | 5°F | Pro / flare | $999.99 at Senville | Check price |
| Pioneer Diamante Pro 18k WYT018GLSI20RL | 1 | 18,000 | 500-750 sq ft | 21 | -4°F | Pro / flare | $1,178$1,679 at Pioneer Mini Split | Check price |
| Senville LETO 24k SENL-24CD | 1 | 24,000 | 1,000-1,250 sq ft | 18.7 | 5°F | Pro / flare | $1,249.99 at Senville | Check price |
| TOSOT Cosmo 24k GWH24AWEXF-D6DNA1FI / GWH24ATEXF-D6DNA1FO | 1 | 24,000 | 1,400 sq ft | 19 | -13°F | Pro / flare | $1,299 at TOSOT Direct | Check price |
| Senville AURA 12k SENA-12HF | 1 | 12,000 | — | 25.4 | -22°F | Pro / flare | $1,399.99 at Sylvane | Check price |
| Senville AURA 12k Ceiling Cassette SENA-12HF-IC | 1 | 12,000 | — | 22.2 | -22°F | Pro / flare | $1,399.99 at Senville | Check price |
| Pioneer Diamante Pro 24k WYT024GLSI20RL | 1 | 24,000 | 750-1,000 sq ft | 21 | -4°F | Pro / flare | $1,528$2,179 at Pioneer Mini Split | 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 |
| MRCOOL DIY Easy Pro 12k EZPRO-12-HP-11516D-O | 1 | 12,000 | up to 550 sq ft | 19.5 | -13°F | True DIY | $1,649 at HVACDirect | Check price at HVACDirect |
| LG Standard 24k KSSAE241A | 1 | 24,000 | up to ~1,500 sq ft | 18 | — | Pro / flare | $1,668 at HVACDirect | Check price at HVACDirect |
| Senville AURA 24k SENA-24HF | 1 | 24,000 | — | — | -22°F | Pro / flare | $1,769.99 at Sylvane | Check price |
| MRCOOL DIY Easy Pro 18k EZPRO-18-HP-23016D-O | 1 | 18,000 | up to 800 sq ft | 20 | -13°F | True DIY | $1,827 at HVACDirect | Check price at HVACDirect |
| Daikin Oterra 12k FTXF12BVJU9 / RXF12BVJU9 | 1 | 12,000 | 400-600 sq ft | 21 | 5°F | Pro / flare | $1,940$2,294.40 at HVACDirect | Check price at HVACDirect |
| Klimaire KSIE 24k KSIE024-H220-S(W) | 1 | 24,000 | — | — | — | Pro / flare | $1,965 at A&A Mini Splits | Check price |
| Pioneer Quantum Ultra 18k Dual-Zone (2x 9k) Quantum Ultra YN020GLFI20M2D | 2 | 18,000 | — | — | -13°F | Pro / flare | $2,094 at Pioneer Mini Split | Check price |
| MRCOOL DIY Easy Pro 24k EZPRO-24-HP-23016D-O | 1 | 24,000 | ~1,050 sq ft | 18.9 | -13°F | True DIY | $2,149 at HVACDirect | Check price at HVACDirect |
| MRCOOL DIY 5th Gen 12k DIY-12-HP-WM-115D25-O | 1 | 12,000 | up to 550 sq ft | 22 | -13°F | True DIY | $2,359 at HVACDirect | Check price at HVACDirect |
| MRCOOL DIY 5th Gen 2-Zone 18k (6+6) DIY-MULTI3-18HP230 | 2 | 18,000 | — | 23.9 | -13°F | Pro / flare | $2,469$2,715.90 at HVACDirect | Check price at HVACDirect |
| Cooper & Hunter Olivia Hyper Heat 24k CH-R24MOLVWM-230VI / CH-RHP24-230VO | 1 | 24,000 | up to ~1,100 sq ft | 22.3 | -22°F | Pro / flare | $2,592.96 at MiniSplitsForLess | Check price |
| MRCOOL DIY 5th Gen 18k DIY-18-HP-WM-230D25-O | 1 | 18,000 | up to 800 sq ft | 21.5 | -13°F | True DIY | $2,909 at HVACDirect | Check price at HVACDirect |
| MRCOOL DIY 5th Gen 24k DIY-24-HP-WM-230D25-O | 1 | 24,000 | up to 1,050 sq ft | 22.7 | -13°F | True DIY | $3,329 at HVACDirect | Check price at HVACDirect |
| MRCOOL DIY 5th Gen 36k DIY-36-HP-WM-230D25-O | 1 | 36,000 | up to 1,550 sq ft | 18 | — | Pro / flare | $3,469 at Sylvane | Check price |
| Mitsubishi EX-Series Hyper-Heat 12k SUZ-AA12NLHZ / MSZ-EX12NLS | 1 | 12,000 | ~400-600 sq ft | 17.6 | — | Pro / flare | $3,792 at HVACDirect | Check price at HVACDirect |
| Daikin Aurora 18k FTXV18AVJU9 / RXT18AVJU9 | 1 | 18,000 | — | 21 | -13°F | Pro / flare | $3,932 at Alpine Home Air | Check price |
| Daikin Aurora MXT 18k 2-Zone (7+15) 2MXT18AVJU9 | 2 | 18,000 | — | 21 | — | Pro / flare | $3,956 at HVACDirect | Check price at HVACDirect |
| LG Multi F RED 18k 2-Zone (12+9) KUMXA181A | 2 | 18,000 | 900-1,050 sq ft | 20 | — | Pro / flare | $4,076 at HVACDirect | Check price at HVACDirect |
| Mitsubishi EX-Series Hyper-Heat 18k SUZ-AA18NLHZ / MSZ-EX18NLS | 1 | 18,000 | up to ~800 sq ft | 17.5 | -13°F | Pro / flare | $4,214.25 at HVACDirect | Check price at HVACDirect |
| MRCOOL DIY 5th Gen 3-Zone 36k (9+9+18) DIY-MULTI5-36HP230D | 3 | 36,000 | Per-zone: 400 / 400 / 1,000 sq ft | 23 | -13°F | Pro / flare | $4,538 at HVACDirect | Check price at HVACDirect |
| MRCOOL DIY 5th Gen 5-Zone 48k (6+9+9+9+12) DIY-MULTI6-48HP-230 | 5 | 48,000 | Per-zone: 250-600 sq ft | 21.8 | — | Pro / flare | $5,970 at HVACDirect | Check price at HVACDirect |
| Mitsubishi FX-Series MXZ 24k 2-Zone Hyper-Heat (12+15) MXZ-3D24NLHZ | 2 | 24,000 | ~1,200-1,400 sq ft total | 20 | — | Pro / flare | $6,860.25 at HVACDirect | Check price at HVACDirect |
| Senville AURA 18k Dual-Zone SENA-18HF/D | 2 | 18,000 | 750-1,250 sq ft | 25 | -22°F | Pro / flare | Not verified no USD price found | Specs source |
| Cooper & Hunter Mia NG 18k CH-NG18MIA230VO | 1 | 18,000 | — | — | -13°F | Pro / flare | Not verified no USD price found | Specs source |
| Klimaire KIWQ-KOIQ DIY 12k KIWQ12H2-45T + KOIQ12H2-45T | 1 | 12,000 | up to 550 sq ft | 24 | -13°F | True DIY | Not verified no USD price found | Specs source |
| TOSOT Muse 18k (prior generation) TST-SU-MUSE-18K230 | 1 | 18,000 | — | — | -13°F | True DIY | Not verified no USD price found | Specs source |
| Hisense Hi-EDGE 12k Hi-EDGE series (no per-size model published) | 1 | 12,000 | — | — | -4°F | Pro / flare | Not verified no USD price found | Specs source |
The chart
Cooling at 20-25 BTU per square foot, 8-9 ft ceilings, average insulation, moderate climate: 300-400 sq ft -> 9,000 BTU; 400-600 -> 12,000; 600-1,000 -> 18,000; 1,000-1,300 -> 24,000; 1,300-1,600 -> 30,000-36,000; 1,600-2,000 -> 36,000; 2,000-2,500 -> 48,000. Sunrooms size at 30-35 BTU/sq ft; kitchens add about 4,000 BTU; garages and shops size to the top of their band.
How to read it
The table below is every verified system in our dataset, so you can see what each class actually costs and how the heating ratings spread inside a class - the two things a bare chart hides.
Buying notes
- When a brand's stated coverage runs well above this chart, it is assuming an easy room - good insulation, mild climate, low ceilings.