12,000 BTU DIY Mini Split: Complete Home Cooling & Heating Solution
Perfect climate control for medium rooms — without professional installation
A 12,000 BTU DIY mini split delivers year-round heating and cooling for spaces up to 550 sq ft — without hiring an HVAC contractor. Zone Air's system ships with pre-charged line sets, meaning no vacuum pumps, no brazing, and no refrigerant license required. You mount the two units, connect the line set and communication wires, and power on — saving $3,000–$5,000 versus a contractor.
550 sq ftCoverage
24 SEER2Efficiency
-13°FCold-climate
115VPlug-in install
45-dayGuarantee
Shop Now ↓From $1,999 · Free shipping · 7-year compressor warranty
Shop 12,000 BTU Mini Split Systems
Four ways to install 12K of capacity — 115V plug-and-play, 230V wall mount, ceiling cassette, or concealed duct. Filter by voltage and form factor below to find your fit.
Open the Sizing Calculator →Single-Zone Systems
One indoor unit, one outdoor unit — for a single room.
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Zone Air® DIY 12,000 BTU 23 SEER2 115V Wall Mount Ductless Mini-Split Heat Pump AC & Heater with Pre-Charged Lineset - Up to 600 Sq Ft
(18)
Up to 600 sq ft|23 SEER2|115V
$1,999.99$2,599.9923% OFF
Save $550
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Zone Air® DIY 12,000 BTU 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump AC & Heater with Pre-Charged Lineset - Up to 600 Sq Ft
(15)
Up to 600 sq ft|24 SEER2|208-230V
$2,049.99$2,599.9921% OFF
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Zone Air® Airframe 12,000 BTU 21 SEER2 230V Ceiling Cassette Mini-Split Heat Pump AC with Pre-Charged Lineset - Up to 600 Sq Ft
(11)
Up to 600 sq ft|21 SEER2|208-230V
$2,799.99$3,299.9915% OFF
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Zone Air® Thin-Air 11,000 BTU 19 SEER2 230V Concealed Mini-Split Heat Pump AC - Up to 550 Sq Ft
(9)
Up to 550 sq ft|19 SEER2|208-230V
$2,699.99$2,999.9910% OFF
Multi-Zone Bundles
Two indoor heads sharing one outdoor condenser — cool/heat two rooms with one system.
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Zone Air® DIY DUAL ZONE 24,000 BTU (12K+12K) 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump System with 2x Pre-Charged Linesets - Up to 1,200 Sq Ft
(9)
Up to 1,200 sq ft (600+600, 2 zones)|24 SEER2|208-230V
$3,999.99$4,599.9913% OFF
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Zone Air® DIY DUAL ZONE 21,000 BTU (12K+9K) 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump System with 2x Pre-Charged Linesets - Up to 1,050 Sq Ft
Up to 1,050 sq ft (600+450, 2 zones)|24 SEER2|208-230V
$3,599.99$4,199.9914% OFF
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Zone Air® DIY DUAL ZONE 30,000 BTU (12K+18K) 24 SEER2 230V Wall Mount Ductless Mini-Split Heat Pump System with 2x Pre-Charged Linesets - Up to 1,500 Sq Ft
Up to 1,500 sq ft (600+900, 2 zones)|24 SEER2|208-230V
$4,499.99$5,299.9915% OFF
Save $1000
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Zone Air® Airframe DUAL ZONE 24,000 BTU (12K+12K) 21 SEER2 230V Ceiling Cassette Mini-Split Heat Pump System with 2x Pre-Charged Linesets - Up to 1,200 Sq Ft
(6)
Up to 1,200 sq ft (600+600, 2 zones)|21 SEER2|208-230V
$5,199.99$6,199.9916% OFF
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Zone Air® Airframe DUAL ZONE 21,500 BTU (12K+9.5K) 21 SEER2 230V Ceiling Cassette Mini-Split Heat Pump System with 2x Pre-Charged Linesets - Up to 1,075 Sq Ft
Up to 1,075 sq ft (600+475, 2 zones)|21 SEER2|208-230V
$5,099.99$5,899.9914% OFF
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Zone Air® Thin-Air DUAL ZONE 22,000 BTU (11K+11K) 19 SEER2 230V Concealed Mini-Split Heat Pump System - Up to 1,100 Sq Ft
(5)
Up to 1,100 sq ft (550+550, 2 zones)|19 SEER2|208-230V
$4,899.99$5,699.9914% OFF
Save $800
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Zone Air® Thin-Air DUAL ZONE 20,500 BTU (11K+9.5K) 19 SEER2 230V Concealed Mini-Split Heat Pump System - Up to 1,025 Sq Ft
Up to 1,025 sq ft (550+475, 2 zones)|19 SEER2|208-230V
$4,699.99$5,499.9915% OFF
Why You'll Love It
| Feature | What it means for you |
|---|---|
| Covers up to 550 sq ft | A 12,000 BTU capacity efficiently handles medium-sized rooms, home additions, and garages throughout the entire summer and well into winter — suitable for cooling spaces up to 550 square feet. |
| Great installation savings | DIY systems install without specialized tools, while professional HVAC installation costs thousands. By skipping the contractor you keep $3,000–$5,000 in your pocket — and there's no costly ductwork to install. |
| Up to 24 SEER2 efficiency | Up to 24 SEER2 means lower energy bills month after month. Higher SEER2 ratings indicate better cooling efficiency, and inverter technology provides variable-speed operation that automatically matches output to your room's needs. |
| Cold-climate certified | This heat pump operates in temperatures as low as -13°F, delivering all-season comfort even in colder climates — and cools in ambient temperatures as high as 122°F. |
| Smart WiFi control | Adjust the temperature remotely from anywhere via the smartphone app, down to the degree. Compatible with Amazon Alexa and Google Assistant for voice control. |
What Makes It Different
Most mini split systems require professional installation, specialized refrigerant handling, and expensive contractor labor. Even popular options like the MrCool DIY line still leave homeowners weighing the price of a project against the hassle of hiring out. Zone Air's 12,000 BTU DIY mini split is built differently:
| What's different | Why it matters |
|---|---|
| Pre-charged line set, zero hassle | Pre-charged refrigerant lines and quick-connect fittings — no vacuum pump, no gauge manifold, no HVAC license. Just connect and go. This is what makes easy installation a reality rather than a marketing promise. |
| Cold-climate performance that delivers | While many budget units lose heating capacity below 5°F, Zone Air's system is cold-climate certified down to -13°F — a hyper-heated home when winter hits hardest, not a system that gives up when you need it most. |
| 45-day guarantee + 7-year warranty | Every purchase is backed by a 45-day money-back guarantee and a 7-year compressor / 5-year parts warranty. If the system doesn't resolve your comfort needs, you're fully protected. |
How It Works
| Step | What you do |
|---|---|
| 1. Mount the units | Secure the indoor air handler to your wall with the included hardware, and place the outdoor unit on a level surface or bracket outside. Drill a small hole through the wall for the line set — no ductwork needed. |
| 2. Connect the pre-charged line set | Run the pre-charged line set between the units and connect the communication wires and refrigerant lines using the quick-connect fittings. Most homeowners complete the entire project in 4–6 hours. |
| 3. Power on and enjoy | Plug into your 115V standard household outlet, configure settings via the included remote or WiFi app, and experience immediate heating and cooling — controllable from any internet-connected device. |
Product Details
| Specification | Detail |
|---|---|
| BTU capacity | 12,000 BTU heating and cooling |
| Coverage area | Up to 550 square feet |
| SEER2 rating | Up to 24 SEER2 for maximum energy efficiency |
| Energy Star | Energy Star certification applies to select mini-split models — this unit qualifies |
| Power requirements | 115V standard household electrical — no dedicated 230V circuit needed |
| Low-temperature operation | Certified heating down to -13°F |
| High-temperature cooling | Operates in ambient temperatures up to 122°F |
| Sound level | Whisper-quiet indoor operation (as low as 19–25 dB on low speed) |
| Refrigerant | Pre-charged — no handling or EPA license required |
| Smart control | Built-in WiFi module; Amazon Alexa and Google Assistant compatible |
| In the box | Indoor unit, outdoor unit, pre-charged line set, WiFi module, remote control, mounting hardware, installation instructions |
| Warranty | 7-year compressor / 5-year parts coverage |
| Satisfaction guarantee | 45-day money-back guarantee |
Zoned comfort lets you control the temperature in specific areas independently — the perfect solution for targeted climate control without conditioning the rest of the house.
Who It's For
| Ideal for | Why it fits |
|---|---|
| Homeowners with medium rooms | Bedrooms, living rooms, home offices, and additions up to 550 sq ft. Not sure about sizing? Use the Mini Split Sizing Calculator to confirm. |
| DIY enthusiasts | If you can mount a TV and follow instructions, you can install this system. The MrCool DIY line was designed for amateur installation, and Zone Air takes that same philosophy even further — installs in just a couple of hours. |
| Garage & workshop owners | A mini split for your garage transforms an unusable space into a year-round workspace without extending your house ductwork. |
| Cold-climate residents | Heat pumps stay energy efficient even in harsh winters. Anyone seeking a reliable hyper-heat solution for colder climates will find certified cold-weather performance here. |
| Energy-conscious homeowners | If you want to cut monthly energy costs while reducing your environmental footprint, this energy-efficient split system fits your needs. |
Frequently Asked Questions
| Question | Answer |
|---|---|
| Do I need an HVAC license to install it? | No. The pre-charged line set eliminates the need for refrigerant handling, vacuum pumps, or brazing. No specialized tools or certifications needed — just basic household tools. Follow our step-by-step installation guide to get started. |
| What room size does it cool and heat? | This 12,000 BTU unit efficiently handles spaces up to 550 sq ft under typical conditions. Coverage depends on insulation, ceiling height, and sun exposure. For larger spaces, step up to an 18,000 BTU or multi-zone system — Zone Air offers comparable options across the capacity range. |
| How difficult is the installation? | Most homeowners complete installation in 4–6 hours. You'll mount the indoor air handler on the wall, set the outdoor unit on a level surface, drill one hole, and connect the pre-charged line set. Full instructions are included with every purchase. |
| Does it work in cold weather? | Yes. This unit is certified for operation down to -13°F. Heat pumps stay energy efficient even in freezing conditions, and maintaining the system requires only regular cleaning or replacement of the air filters to keep performance at its peak. |
| Is it better than a window air conditioner? | Significantly. A mini split is quieter, more efficient, heats and cools, and doesn't block your window. Learn more about mini split vs. window AC. |
| What if I'm not satisfied? | Zone Air includes a 45-day money-back guarantee with every unit. If it's not the right fit, we'll resolve it — no questions asked. |
Ready to Upgrade?
Stop paying contractor markups for basic climate control. Stop dealing with noisy window units that block your view. Stop losing energy to leaky ductwork.
Choose the Zone Air 12,000 BTU DIY Mini Split and experience real savings, hyper-efficient comfort, and all-season control in any room of your house.
Shop Now ↓Secure checkout. Fast shipping. 45-day satisfaction guarantee. 7-year compressor / 5-year parts warranty. Full company support from purchase through installation and beyond.