Why it matters
The Cooper & Hunter 9,000 BTU 230V Mini-Split is rated at 9,000 BTU of cooling. On the ENERGY STAR room sizing chart that suits about 350 to 400 sq ft of average room. It needs a 230V (208/240V) circuit, which usually means an electrician if one isn't already at the spot.
Its 21.2 SEER2 ranks 4 of 10 among the mini-splits within about 12% of its capacity that we cover; the most efficient is the DELLA Optima 9,000 BTU 230V at 23. 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 24 dB at its quietest setting.
Expect a professional install: the copper lines are connected, pressure-checked and vacuumed before the refrigerant is released. It uses R-454B refrigerant, one of the lower-impact A2L refrigerants new systems moved to in 2025. Warranty, per the listing: 7 years compressor, 5 years parts.
The listing gives dimensions of 48 inD x 40 inW x 40 inH and a shipping or unit weight of 101.1 pounds.
Who it's for, and who should skip it
Good fit if
- Rooms of about 350-400 sq ft
- Large rooms and garages
Look elsewhere if
- Primary heat in cold climates
- Spaces much larger than 400 sq ft
- Owners who want to avoid a licensed install
Pros and cons
Pros
- 21.2 SEER2
- Heats down to 5°F
- Quiet indoor head (24 dB)
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 | 0.75 tons | Retailer |
|---|---|---|
| Cooling capacity (maker) | 9000 BTU | Retailer |
| Features (seller) | WiFi Enabled | Retailer |
| Dimensions (seller) | 48"D x 40"W x 40"H | Retailer |
| SEER (maker) | 21.2 | Retailer |
| Voltage | 230 V | Retailer |
| Noise (seller) | 24 db | Retailer |
| Refrigerant | R-454B | Retailer |
| Control | App | Retailer |
| Model number | CH-RLS09MIA-230VI/O | Retailer |
| Warranty | 7 years compressor, 5 years parts | Retailer |
| Product weight | 101.1 lb | Retailer |
| SEER2 (maker) | 21.2 | Retailer |
| Heats down to (maker) | 5°F | Retailer |
Alternatives worth comparing
More ductless mini-splits we cover
- Albott 24,000 BTU 230V Mini-Split
- Garvee 24,000 BTU 230V Mini-Split
- Cooper & Hunter MIA 12,000 BTU 230V
- COSTWAY 24,000 BTU 230V Mini-Split
All ductless mini-splits, compared in one table · Every Cooper & Hunter product we cover
Final verdict
A straightforward choice for a 350-400 sq ft room. Check that 9,000 BTU fits your room with the BTU calculator before you buy.
Where to buy
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