Why it matters
The Cooper & Hunter MIA 18,000 BTU 230V is rated at 18,000 BTU of cooling and 18,000 BTU of heating. On the ENERGY STAR room sizing chart that suits about 700 to 1,000 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 19.2 SEER2 ranks 8 of 16 among the mini-splits within about 12% of its capacity that we cover; the most efficient is the DELLA Optima 18,000 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 30 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. Warranty, per the listing: 7 years compressor, 5 years parts.
The listing gives dimensions of 48 inD x 40 inW x 40 inH.
Who it's for, and who should skip it
Good fit if
- Rooms of about 700-1,000 sq ft
- Large rooms and garages
Look elsewhere if
- Primary heat in cold climates
- Spaces much larger than 1,000 sq ft
- Owners who want to avoid a licensed install
Pros and cons
Pros
- 19.2 SEER2
- 18,000 BTU heating stated
- Heats down to 5°F
- 16FT insulated copper line set included
Cons
- Heating stops around 5°F
- 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 | 1.5 tons | Retailer |
|---|---|---|
| Cooling capacity (maker) | 18000 BTU | Retailer |
| Features (seller) | Dehumidifier, Heating & Cooling Function, Inverter Compressor, Remote Controlled, WiFi Enabled | Retailer |
| Dimensions (seller) | 48"D x 40"W x 40"H | Retailer |
| SEER (maker) | 19 | Retailer |
| Voltage | 230 V | Retailer |
| Noise (seller) | 30 db | Retailer |
| Refrigerant | R-454B | Retailer |
| Control | App, Remote | Retailer |
| Heating capacity (maker) | 18,000 BTU | Retailer |
| Model number | CH-RLS18MIA-230VI & CH-RLS18MIA-230VO | Retailer |
| Warranty | 7 years compressor, 5 years parts | Retailer |
| SEER2 (maker) | 19.2 | 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
- ROVSUN 24,000 BTU 230V Mini-Split
- Senville LETO 24,000 BTU 230V
- Daikin Entra 12,000 BTU 230V
- DELLA Umbra 23,000 BTU 230V
All ductless mini-splits, compared in one table · Every Cooper & Hunter product we cover
Final verdict
A sensible choice for a 700-1,000 sq ft room. Check that 18,000 BTU fits your room with the BTU calculator before you buy.
Where to buy
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