Why it matters
The Cooper & Hunter MIA 12,000 BTU 230V 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 550 sq ft. It needs a 230V (208/240V) circuit, which usually means an electrician if one isn't already at the spot.
Its 21.3 SEER2 ranks 7 of 26 among the mini-splits within about 12% of its capacity that we cover; the most efficient is the DELLA Optima 12,000 BTU 230V at 24. The maker says heat-pump heating keeps working down to 5°F outside; below that you need another heat source. Indoor noise is listed at 56 dB at its quietest setting.
Installation needs the lines vacuumed and the valves opened after the line set is connected; most makers tie the warranty to a licensed installer. The kit includes a 16FT insulated copper line set. It uses R-454B refrigerant, one of the lower-impact A2L refrigerants new systems moved to in 2025.
The listing gives dimensions of 48 inD x 40 inW x 40 inH and a 1,200 W power draw.
Who it's for, and who should skip it
Good fit if
- Rooms of about 450-550 sq ft
- Large rooms and garages
Look elsewhere if
- Primary heat in cold climates
- Spaces much larger than 550 sq ft
- Owners who want to avoid a licensed install
Pros and cons
Pros
- 21.3 SEER2
- Heats down to 5°F
- 16FT insulated copper line set included
Cons
- Heating stops around 5°F
- Heating capacity not stated on the listing
- Needs a 230V circuit
- Professional install recommended
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 & Cooling Function, Inverter Compressor, Multiple Fan Speeds, Sleep Mode, WiFi Enabled | Retailer |
| Dimensions (seller) | 48"D x 40"W x 40"H | Retailer |
| SEER (maker) | 21.3 | Retailer |
| Voltage | 230 V AC | Retailer |
| Noise (seller) | 56 db | Retailer |
| Refrigerant | R-454B | Retailer |
| Wattage | 1200 | Retailer |
| Control | App | Retailer |
| Model number | CH-RLS12MIA-230VI/ CH-RLS12MIA-230VO | Retailer |
| Room size (maker) | 550 sq ft | Retailer |
| SEER2 (maker) | 21.3 | Retailer |
| Heats down to (maker) | 5°F | Retailer |
| Line set included | 16FT insulated copper line set | Retailer |
Alternatives worth comparing
More ductless mini-splits we cover
- COSTWAY 24,000 BTU 230V Mini-Split
- DELLA Motto 18,000 BTU 230V
- Mountman 24,000 BTU 230V Mini-Split
- Temprium 24,000 BTU 230V Mini-Split
All ductless mini-splits, compared in one table · Every Cooper & Hunter product we cover
Final verdict
A sensible choice for a 450-550 sq ft room. Check that 12,000 BTU fits your room with the BTU calculator before you buy.
Where to buy
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