Why it matters
The COSTWAY 9,000 BTU 230V Mini-Split is rated at 9,000 BTU of cooling and 9,000 BTU of heating. On the ENERGY STAR room sizing chart that suits about 350 to 400 sq ft of average room; the maker says up to 450 sq ft. It needs a 230V (208/240V) circuit, which usually means an electrician if one isn't already at the spot.
Its 17 SEER ranks 4 of 4 among the mini-splits within about 12% of its capacity that we cover; the most efficient is the Senville AURA 9,000 BTU 230V at 28. 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 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 8 inD x 31.2 inW x 11.5 inH, a shipping or unit weight of 24.4 pounds and a 860 W power draw.
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
- 17 SEER
- 9,000 BTU heating stated
- Quiet indoor head (23 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 | 0.75 tons | Retailer |
|---|---|---|
| Cooling capacity (maker) | 9000 BTU | Retailer |
| Dimensions (seller) | 8"D x 31.2"W x 11.5"H | Retailer |
| SEER (maker) | 17 | Retailer |
| Voltage | 208 V AC | Retailer |
| Noise (seller) | 23 db | Retailer |
| Features (seller) | Energy Efficient, Auto Clean, Dehumidifier, Dust Filter, Fast Cooling, Heating And Cooling Function, Inverter Compressor, 4 Way Swing, ECO mode, iFEEL, and Turbo function | Retailer |
| Refrigerant | R-32 | Retailer |
| Product weight | 24.4 lb | Retailer |
| Room size (maker) | 450 sq ft | Retailer |
| Heating capacity (maker) | 9000 BTU | Retailer |
| Model number | FP10404US-WH+ | Retailer |
| Wattage | 860 W | Retailer |
| Control | Remote | Retailer |
Alternatives worth comparing
More ductless mini-splits we cover
- COSTWAY 9,000 BTU 230V Mini-Split, 21 SEER2
- Garvee 12,000 BTU 230V Mini-Split
- Rellytech 18,000 BTU 230V Mini-Split, 19 SEER2
- Rellytech 17,000 BTU 230V Mini-Split
All ductless mini-splits, compared in one table · Every COSTWAY product we cover
Final verdict
A straightforward choice for a 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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