Why it matters
The COSTWAY 18,000 BTU 230V Mini-Split is rated at 18,000 BTU of cooling and 18,700 BTU of heating. On the ENERGY STAR room sizing chart that suits about 700 to 1,000 sq ft of average room; the maker says up to 1,250 sq ft. It needs a 230V (208/240V) circuit, which usually means an electrician if one isn't already at the spot.
Its 19 SEER2 ranks 9 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. Heating efficiency is 9 HSPF2. 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 25 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-32 refrigerant, one of the lower-impact A2L refrigerants new systems moved to in 2025.
The listing gives dimensions of 12.64 inD x 37.6 inW x 8.96 inH, a shipping or unit weight of 23 pounds and a 1,900 W power draw.
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 SEER2
- 18,700 BTU heating stated
- Quiet indoor head (25 dB)
Cons
- Low-temperature heating not stated
- 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) | 4 Way Swing, Dehumidifier, Fast Cooling, Heating & Cooling Function, Remote Controlled | Retailer |
| Dimensions (seller) | 12.64"D x 37.6"W x 8.96"H | Retailer |
| SEER (maker) | 19 | Retailer |
| Voltage | 230 V AC | Retailer |
| Noise (seller) | 25 db | Retailer |
| Refrigerant | R-32 | Retailer |
| Wattage | 1900 W | Retailer |
| Room size (maker) | 1250 sq ft | Retailer |
| Model number | 11090-CYFP | Retailer |
| Product weight | 23 lb | Retailer |
| Control | Remote | Retailer |
| Heating capacity (maker) | 18700 BTU | Retailer |
| SEER2 (maker) | 19 | Retailer |
| HSPF2 (maker) | 9 | Retailer |
Alternatives worth comparing
More ductless mini-splits we cover
- ActiveTrail 23,000 BTU 230V Mini-Split
- DELLA Vario 12,000 BTU 230V
- Cooper & Hunter 9,000 BTU 230V Mini-Split
- Albott 24,000 BTU 230V Mini-Split
All ductless mini-splits, compared in one table · Every COSTWAY product we cover
Final verdict
A straightforward 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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