Why it matters
The Senville LETO 12,000 BTU 115V 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 700 sq ft. It runs on 115V, so it needs a dedicated household circuit rather than a 240V line.
Its 20.8 SEER ranks 3 of 5 among the mini-splits within about 12% of its capacity that we cover; the most efficient is the MRCOOL DIY 12,000 BTU 115V at 22. 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 28 dB at its quietest setting.
Expect a professional install: the copper lines are connected, pressure-checked and vacuumed before the refrigerant is released. The kit includes a 16ft. line set. It uses R-454B refrigerant, one of the lower-impact A2L refrigerants new systems moved to in 2025.
The listing gives dimensions of 10.43 inD x 26 inW x 21.26 inH, a shipping or unit weight of 78.3 pounds, a 1,020 W power draw and indoor air handler, outdoor condenser 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
- Lower running costs than most same-size systems
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
- 20.8 SEER
- Heats down to 5°F
- 16ft. line set included
- Quiet indoor head (28 dB)
Cons
- Heating stops around 5°F
- 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 tons | Retailer |
|---|---|---|
| Cooling capacity (maker) | 12000 BTU | Retailer |
| Features (seller) | Alexa Enabled | Retailer |
| Dimensions (seller) | 10.43"D x 26"W x 21.26"H | Retailer |
| SEER (maker) | 20.8 | Retailer |
| Voltage | 110 V | Retailer |
| Noise (seller) | 28 db | Retailer |
| Refrigerant | R-454B | Retailer |
| Wattage | 1020 W | Retailer |
| Room size (maker) | 700 sq ft | Retailer |
| Model number | SENL-12CD-16 | Retailer |
| Product weight | 78.3 lb | Retailer |
| Control | Remote | Retailer |
| Heats down to (maker) | 5°F | Retailer |
| Line set included | 16ft. line set | Retailer |
Alternatives worth comparing
More ductless mini-splits we cover
- Cooper & Hunter MIA 12,000 BTU 115V
- Garvee 9,000 BTU 230V Mini-Split
- COSTWAY 9,000 BTU 230V Mini-Split
- COSTWAY 9,000 BTU 230V Mini-Split, 21 SEER2
All ductless mini-splits, compared in one table · Every Senville product we cover
Final verdict
A straightforward 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
Our links open this exact model's product page. Prices and stock change; check what's included before you order.
Each button opens this exact model. We may earn a commission on tracked links; it never changes what we publish. Disclosure