Mini Split Running Cost: What the SEER2 Math Says
Running cost is the one number every buyer wants and no listing states honestly. This page computes it in the open: at 1,000 equivalent full-load cooling hours and $0.16/kWh (state your own rate and scale linearly), a system's seasonal cooling electricity is roughly its BTU divided by its SEER2, in kWh. The per-class results: 9,000 BTU class (avg 21.2 SEER2 across 1 verified systems): about 425 kWh per cooling season, roughly $68 at $0.16/kWh. 12,000 BTU class (avg 20.7 SEER2 across 12 verified systems): about 580 kWh per cooling season, roughly $93 at $0.16/kWh. 18,000 BTU class (avg 20.6 SEER2 across 9 verified systems): about 875 kWh per cooling season, roughly $140 at $0.16/kWh. 24,000 BTU class (avg 20.1 SEER2 across 8 verified systems): about 1,196 kWh per cooling season, roughly $191 at $0.16/kWh. 36,000 BTU class (avg 20.5 SEER2 across 2 verified systems): about 1,756 kWh per cooling season, roughly $281 at $0.16/kWh. For reference, one manufacturer (DELLA) publishes $70-$110/month running-cost estimates for a 24k model - the same order of magnitude. The table ranks every priced system with a verified SEER2.
Computed from our dataset
- 33 system(s) from our verified dataset appear on this page.
- Price range: $729.57 to $6,860.25 (verified 2026-11-04).
- Cheapest: Cooper & Hunter MIA 12k at $729.57 (MiniSplitsForLess).
- Highest SEER2: Senville AURA 12k at 25.4 SEER2.
- Best heating rating: Senville AURA 12k, rated to -22°F.
- True DIY in this list: 6 system(s) with factory pre-charged line sets.
| System | Zones | BTU | Coverage | SEER2 | Heats to | Install | 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 |
| 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 |
| 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 |
| 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 |
Buying notes
- These are cooling-season estimates with stated assumptions, not measurements; heating cost depends on HSPF2 and your climate, and heating with a mini split typically undercuts electric baseboard by 50-70% in published comparisons.
- The efficiency gap compounds: two points of SEER2 on a big system is real money across a 10-15 year life.