Why it matters
The Nexaro 12,000 BTU 115V Mini-Split, 19 SEER2 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 750 sq ft. It runs on 115V, so it needs a dedicated household circuit rather than a 240V line.
Its 19 SEER2 ranks 16 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 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 38 dB at its quietest setting.
Like most split systems it ships pre-charged for a set line length; connecting it means flaring, pulling a vacuum and opening the valves, a licensed technician's job in most places. It uses R-32 refrigerant, one of the lower-impact A2L refrigerants new systems moved to in 2025. Warranty, per the listing: 1 Year.
The listing gives dimensions of 8.21 inD x 32.32 inW x 11.91 inH, a shipping or unit weight of 25.5 pounds, a 210 W power draw and remote in the box.
Who it's for, and who should skip it
Good fit if
- Rooms of about 450-550 sq ft
- Homes without a spare 240V circuit
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
- 19 SEER2
Cons
- Low-temperature heating not stated
- Heating capacity not stated on the listing
- 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) | 12000 BTU | Retailer |
| Dimensions (seller) | 8.21"D x 32.32"W x 11.91"H | Retailer |
| SEER (maker) | 19 | Retailer |
| Voltage | 115 V | Retailer |
| Noise (seller) | 38 db | Retailer |
| Features (seller) | Auto Swing, Auto Clean, Dehumidifier, Dust Filter, ECO mode, Energy Efficient, Fast Cooling, Heating And Cooling Function, Inverter Compressor, Turbo function, iFEEL | Retailer |
| Refrigerant | R-32 | Retailer |
| Wattage | 210 W | Retailer |
| Product weight | 25.5 lb | Retailer |
| Model number | NexaroS121 | Retailer |
| Warranty | 1 Year | Retailer |
| Room size (maker) | 750 sq ft | Retailer |
| SEER2 (maker) | 19 | Retailer |
Alternatives worth comparing
More ductless mini-splits we cover
Final verdict
A solid 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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