12,000 BTU Heat Pumps: Which Mini-Split to Buy

Need something different?

• 

  Hiring an installer anyway

  Turbro Greenland 12,000 BTU · 24 SEER2

  $759.01 less than the DIY kit. An installer vacuums and charges the refrigerant lines.

  $699.99 on Amazon
• 

  Cold winters

  Daikin Atmosphera 12,000 BTU · 25.2 SEER2

  Keeps 100% of its heat at 5°F, against 72% for our pick. Needs an installer.

  $2,848 on Amazon
• 

  Only a 120-volt circuit

  Perfect Aire Quick Connect 12,000 BTU · 22 SEER2

  Runs on a 120-volt circuit instead of 240 volts. It still needs its own circuit. Also a DIY kit.

  $1,719.99 on Amazon

What room does a 12,000 BTU mini-split fit?

One indoor head cools and heats the room it is in, or an open area. ENERGY STAR's sizing chart, for an 8-foot ceiling:

This chart is a starting point for cooling. The U.S. Department of Energy warns that a square-foot rule ignores your climate and insulation, and recommends a contractor's load calculation (Manual J). For heat in a cold climate, compare how much heat each unit still makes on a 5°F day (in every table here).

ENERGY STAR adds 10% for a very sunny room, takes off 10% for a shaded one and adds 4,000 BTU for a kitchen. Sources: ENERGY STAR sizing chart, DOE Energy Saver. Other sizes: 18,000 BTU · 24,000 BTU.

What it costs

Amazon prices read today. Installed prices are U.S. typical, equipment, labor and permit together, from EnergySage, Modernize and other published 2026 data (compiled July 2026). Every option also needs its own electrical circuit.

Can you install it yourself?

Only a true DIY kit. Its refrigerant lines come pre-charged and click together. Other mini-splits ship standard lines that an installer must vacuum and charge, and some makers void the warranty without one. What each brand here says:

• Turbro: Pro recommended. DIY guide included, but "professional installation is still recommended." (Amazon listing (seller's words))
• Klimaire DIY: Yes. "DIY installation allowed (must follow local code)." Klimaire warranty information
• MRCOOL: Yes. "With no registration required, MRCOOL warrants" the system, if "installed according to the installation instructions." MRCOOL DIY Select Series limited warranty (PDF, rev. 03.31.26)
• Perfect Aire: Yes. "Perfect for the DIY home installer," with "Quick Connect adaptors." Perfect Aire product page
• Cooper & Hunter: No. "This is not a DIY system, professional installation is required per the manufacturer." (Amazon listing (seller's words; Cooper & Hunter's site would not load for us))

1. Plan the circuit. A 115V unit runs on a 120-volt circuit; a 230V unit needs 240 volts, like an electric dryer. Either way it needs its own circuit, and MRCOOL's installation manual says the wiring "must be installed by a licensed electrician."
2. Measure the line run. From the indoor head's spot to the outdoor unit. The Klimaire DIY 12,000 BTU ships 25 ft of line.
3. One room per head. Closed rooms each need their own head.

Every 12,000 BTU mini-split we matched on Amazon (8)

12,000 BTU mini-splits on Amazon: install type, power, efficiency, heat kept at 5°F and price

Mini-split	Install	Power	SEER2	Heat kept at 5°F	Price	Buy
Turbro Greenland 12,000 BTU	DIY guide, pro recommended	230V	24	72%	$699.99	Buy
Klimaire DIY 12,000 BTU	DIY kit	230V	24	72%	$1,459	Buy
Daikin Oterra 12,000 BTU 115V	Installer needed	115V	20	69%	$1,509	Buy
MRCOOL DIY Select 12,000 BTU	DIY kit	115V	17.5	52%	$1,549	Buy
Daikin Oterra 12,000 BTU (RXF12AXVJU)	Installer needed	—	21	49%	$1,601.40	Buy
Perfect Aire Quick Connect 12,000 BTU	DIY kit	115V	22	77%	$1,719.99	Buy
Cooper & Hunter Hyper Heat 12,000 BTU	Installer needed	230V	24	96%	$1,824.99	Buy
Daikin Atmosphera 12,000 BTU	Installer needed	—	25.2	100%	$2,848	Buy

Each listing is matched to its exact certified system; SEER2 and heat at 5°F are the certified figures; heat kept at 5°F is how much of its rated heat a unit still makes on a 5°F day. Prices read live on Amazon today. A dash means the listing doesn't say.

Questions buyers ask

How many square feet does a 12,000 BTU mini-split cover?

About 450 to 550 sq ft for cooling, from ENERGY STAR's sizing chart for an 8-foot ceiling. For heat in a cold climate, check how much heat the unit keeps at 5°F: our pick keeps 72%.

How much does a 12,000 BTU mini-split cost?

On Amazon, $699.99 to $2,848 for the 8 we matched to their certified ratings. Installed by a contractor, a single-zone, up to 15k BTU system typically runs $2,000 to $5,500.

Can I install a 12,000 BTU mini-split myself?

Yes, with a true DIY kit: its refrigerant lines come pre-charged and click together, so you need no vacuum pump. Klimaire says: "DIY installation allowed (must follow local code)." You still need an electrician for the new circuit.

Does a mini-split heat pump work in winter?

Yes, but it makes less heat as it gets colder. The certified figure to compare is heat at 5°F. On a 5°F day our pick still makes 72% of its rated heat; the Daikin Atmosphera 12,000 BTU makes 100%.

Will one 12,000 BTU mini-split heat my whole house?

One indoor head heats and cools the room it is in, or an open area. Closed rooms need their own head (a multi-zone system) or a ducted heat pump, which an installer quotes.