Why it matters
The MRCOOL DIY 12,000 BTU 115V is rated at 12,000 BTU of cooling. On the ENERGY STAR room sizing chart that suits about 450 to 550 sq ft of average room; the maker says up to 500 sq ft. It runs on 115V, so it needs a dedicated household circuit rather than a 240V line.
Its 22 SEER ranks 1 of 5 among the mini-splits within about 12% of its capacity that we cover, the top of that group. The listing doesn't give a low-temperature heating limit, so treat it as a mild-climate heat pump until the maker confirms one. Indoor noise is listed at 23.5 dB at its quietest setting.
The line set comes pre-charged with quick-connect fittings, so the install skips the vacuum pump and refrigerant handling a standard mini-split needs. It uses R-410A refrigerant, the older refrigerant new systems stopped using in 2025; remaining stock can still be installed. Warranty, per the listing: Warranty.
The listing gives dimensions of 16 inD x 26 inW x 36 inH, a shipping or unit weight of 100 pounds and ductless mini-split in the box.
Who it's for, and who should skip it
Good fit if
- Rooms of about 450-550 sq ft
- DIY installs
- Lower running costs than most same-size systems
Look elsewhere if
- Primary heat in cold climates
- Spaces much larger than 550 sq ft
- Line runs longer than the included pre-charged set
Pros and cons
Pros
- 22 SEER
- No refrigerant handling to install
- Quiet indoor head (23.5 dB)
Cons
- Low-temperature heating not stated
- Heating capacity not stated on the listing
- Older R-410A refrigerant
Limitations to weigh
- Capacity and efficiency are the maker's ratings; real output depends on the install, the line length and the weather.
- Heat pumps lose heating capacity as it gets colder; size for your climate with the BTU calculator.
- The federal 25C tax credit ended for systems installed after 2025; check your utility for current rebates.
Specifications
Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.
| Capacity | 1 tons | Retailer |
|---|---|---|
| Cooling capacity (maker) | 12000 BTU | Retailer |
| Features (seller) | Heating And Cooling Function | Retailer |
| Dimensions (seller) | 16"D x 26"W x 36"H | Retailer |
| SEER (maker) | 22 | Retailer |
| Voltage | 115 | Retailer |
| Noise (seller) | 23.5 db | Retailer |
| Refrigerant | R-410A | Retailer |
| Wattage | 25 | Retailer |
| Room size (maker) | 500 sq ft | Retailer |
| Model number | DIY-12-HP-WM-115C25 | Retailer |
| Warranty | Warranty | Retailer |
| Product weight | 100 lb | Retailer |
| Control | App, Remote, Voice | Retailer |
| DIY install | DIY Installation | Retailer |
Alternatives worth comparing
More ductless mini-splits we cover
- MRCOOL Easy Pro 18,000 BTU 230V (EZPRO-18-HP-23016)
- MRCOOL Easy Pro 18,000 BTU 230V
- MRCOOL DIY 24,000 BTU 230V
- Senville Floor Console 12,000 BTU 230V
All ductless mini-splits, compared in one table · Every MRCOOL product we cover
Final verdict
The pick if you want to install it yourself. Check that 12,000 BTU fits your room with the BTU calculator before you buy.
Where to buy
Our links open this exact model's product page. Prices and stock change; check what's included before you order.
Each button opens this exact model. We may earn a commission on tracked links; it never changes what we publish. Disclosure