The best 12,000 BTU mini splits of 2026

Before you commit to 12k, run the sizing calculator. Oversizing is the most expensive common mistake in ductless: a system that is too big short-cycles, never reaches its rated efficiency, and leaves the room humid. A room that genuinely needs 9,000 BTU is worse served by a 12,000 BTU unit than by the right one.

Best overall you can actually buy: Senville ELITE 12k

The Senville ELITE Series 12k 230V is the pick for most people. SEER2 29.4 and HSPF2 12.7 are near the top of anything at this capacity and it is rated to -22F for heating. Senville markets it for self-installation; we classify it as a professional install, because its precharged line set uses flared connections that still need flaring, a vacuum and a leak check. So the install path is open to you if you want it. Senville sells it direct.

That combination - top-tier efficiency, genuine cold-climate heating, and a direct-to-consumer price - is why it wins.

Best alternative: Blueridge XS6 Max Efficiency 12k

The Blueridge XS6 Max Efficiency 12k 230V matches the Senville almost spec for spec - SEER2 29.4, HSPF2 12.7, -22F - and is sold through Alpine Home Air. It is the one to take if you prefer that retailer or want a second quote on the same performance tier.

Best on price: ACiQ Extreme 12k

The ACiQ Extreme 12k 230V, sold at HVACDirect, is the budget pick of the three. You give up efficiency to get there: SEER2 25.4 and HSPF2 10.5 against the Senville's 29.4 and 12.7. It still carries the same -22F heating floor, so the cold-weather capability is not what you are trading away.

Worth doing the arithmetic rather than assuming: when the price gap to the Senville is small, the efficiency difference recovers it quickly in most climates. Compare the current prices on the two model pages, and buy the ACiQ because you prefer the retailer or the professional-install route, not because it is cheaper.

If you want the 115V route: MRCOOL DIY 12k

The MRCOOL DIY 5th Generation 12k 115V is the only pick here that runs on 115V, which matters when your panel is full or a 230V circuit would mean a panel project. It also ships precharged with a quick-connect line set, so it needs no vacuum pump or gauges. EPA's Section 608 guidance says connecting pre-charged lines still requires technician certification.

The tradeoffs are real: SEER2 23.5 is the lowest of these picks, and its heating floor is -13F rather than -22F. Note also that we could not verify a current price for it; the model page shows the last figure we saw as reference only. See best 115V mini splits if the voltage is the deciding factor.

The highest-rated 12k systems are not on this list

Some of the top-scoring 12,000 BTU systems on this site, led by the Fujitsu AIRSTAGE Orion XLTH 12k 230V (SEER2 30.5, HSPF2 12.7), are not picks here, and the reason is worth your attention.

Fujitsu states that it does not authorize online retail sales of any of its products, and that warranty is void on internet purchases. There is no online price for it on this site because there is no legitimate online purchase to make. The same applies to the Carrier Infinity 35 12k 230V: Carrier's ductless warranty does not cover any product purchased over the internet.

Those systems are excellent. If you want one, buy it through a dealer, not a website. We explain which brands do and do not survive an online purchase in does buying online void your warranty.

How to choose between them

• Efficiency decides your running cost. SEER2 29.4 versus 25.4 is a real gap over a system's life; the operating cost calculator will put a number on it for your electricity rate.
• The heating floor decides whether it works in February. All of the picks except the MRCOOL are rated to -22F, which covers most of the US.
• The install path decides your total cost. DIY-marketed does not mean easy
  • see DIY vs professional installation before assuming you will do it yourself.
• Price is the one to weigh last. Equipment is a minority of an installed cost; the installation cost estimator shows what the rest looks like.

Check each model page for today's price before you buy.

Sources

• Air-Conditioning, Heating, and Refrigeration Institute: AHRI Appendix M1 public detail for ACIQ-12ZPL-HP230C / ACIQ-12W-HH-MD - ACiQ Extreme 12,000 BTU R-454B 208/230V (ACIQ-12W-HH-MD / ACIQ-12ZPL-HP230C), retrieved Jul 26, 2026.
• ENERGY STAR: ENERGY STAR exact row check for AHRI 216032335 - ACiQ Extreme 12,000 BTU R-454B 208/230V (ACIQ-12W-HH-MD / ACIQ-12ZPL-HP230C), retrieved Jul 26, 2026.
• HVACDirect / ACiQ: 12,000 BTU ACiQ Extreme 25.4 SEER2 Single Zone Wall Mount Mini Split Heat Pump System - R454B | 230V - ACiQ Extreme 12,000 BTU R-454B 208/230V (ACIQ-12W-HH-MD / ACIQ-12ZPL-HP230C), retrieved Jul 26, 2026.
• Air-Conditioning, Heating, and Refrigeration Institute: AHRI Appendix M1 public detail for BXS6A12UC0 / BXS6A12WM0 - Blueridge XS6 Max Efficiency 12,000 BTU R-454B 208/230V (BXS6A12WM0 / BXS6A12UC0), retrieved Jul 24, 2026.
• Alpine Home Air Products: Blueridge BXS6A09UC0-9WM Alpine product specification grid - Blueridge XS6 Max Efficiency 12,000 BTU R-454B 208/230V (BXS6A12WM0 / BXS6A12UC0), retrieved Jul 24, 2026.
• Blueridge / Alpine Home Air Products: Flared line set and professional startup evidence - Blueridge XS6 Max Efficiency 12,000 BTU R-454B 208/230V (BXS6A12WM0 / BXS6A12UC0), retrieved Aug 17, 2026.
• Blueridge / Alpine Home Air Products: Flared line set and professional startup evidence - Blueridge XS6 Max Efficiency 12,000 BTU R-454B 208/230V (BXS6A12WM0 / BXS6A12UC0), retrieved Aug 29, 2026.
• ENERGY STAR: ENERGY STAR exact row check for AHRI 216997533 - Blueridge XS6 Max Efficiency 12,000 BTU R-454B 208/230V (BXS6A12WM0 / BXS6A12UC0), retrieved Jul 24, 2026.
• Air-Conditioning, Heating, and Refrigeration Institute: AHRI Appendix M1 public detail for 37MPRAQ12AA3 / 45MPHAQ12XA3 - Carrier Infinity 35 12,000 BTU R-454B 208/230V (45MPHAQ12XA3 / 37MPRAQ12AA3), retrieved Jul 27, 2026.
• Carrier Corporation: Carrier Infinity 35 Mini Split Heat Pump with Basepan Heater - Carrier Infinity 35 12,000 BTU R-454B 208/230V (45MPHAQ12XA3 / 37MPRAQ12AA3), retrieved Jul 27, 2026.
• ENERGY STAR: ENERGY STAR exact row check for AHRI 215413143 - Carrier Infinity 35 12,000 BTU R-454B 208/230V (45MPHAQ12XA3 / 37MPRAQ12AA3), retrieved Jul 27, 2026.
• HVACDirect: HVACDirect exact Carrier offer for 37MPRAQ12AA3 / 45MPHAQ12XA3 - Carrier Infinity 35 12,000 BTU R-454B 208/230V (45MPHAQ12XA3 / 37MPRAQ12AA3), retrieved Jul 27, 2026.