Senville LETO 12,000 BTU vs TOSOT Cosmo 12,000 BTU
Quick take: The TOSOT Cosmo 12,000 BTU costs $1 less; the TOSOT Cosmo is genuine cold-climate hardware (rated to -13°F) while the Senville LETO 12,000 BTU is better kept to milder winters; the Senville LETO is the more efficient unit (21.2 SEER2).
| Spec | Senville LETO 12,000 BTU | TOSOT Cosmo 12,000 BTU |
|---|---|---|
| Price | ~$800 | ~$799 |
| Type | Single-Zone | Single-Zone |
| Capacity | 12k BTU | 12k BTU |
| Coverage | ~550 sq ft | ~550 sq ft |
| SEER2 (cooling) | 21.2 | 19 |
| HSPF2 (heating) | 8.7 | 8.5 |
| Low-Ambient Heating | to 5°F | to -13°F |
| Max heat at 5°F (NEEP) | 6,600 BTU | 9,100 BTU |
| Heat kept at 5°F | 55% of rated | 76% of rated |
| Refrigerant | R-454B | R-32 |
| Zones | Single zone | Single zone |
| Voltage | 115V | 230V |
| WiFi Control | Built-in | Built-in |
| Install | Flare fittings plus a mandatory vacuum pull; pre-charged R454B covers linesets to 25 ft. Requires a dedicated 115V circuit (15-20A); typical pro install runs $1,200-$2,800, and warranty claims require the installer's license info. | Flare connections with required evacuation; 16 ft copper lineset included. Available in 115V and 230V versions — check the model suffix before wiring. |
| Warranty | 5-year compressor, 5-year parts (professional install + registration required) | 5-year whole-unit warranty |
Pros & cons
Senville LETO 12,000 BTU
- ✓21.2 SEER2 with DC inverter compressor cuts energy use sharply vs window units
- ✓Pre-charged for 25 ft of lineset with 16 ft install kit included
- ✓Midea-built hardware shared with far more expensive brands
- ✓USB Wi-Fi kit for app and Alexa control included; dehumidify, turbo, and sleep modes standard
- ✗5°F heating floor means it's supplemental heat only in northern climates
- ✗Warranty voided without licensed professional installation
- ✗New R454B (A2L) refrigerant — some installers surcharge or decline it
TOSOT Cosmo 12,000 BTU
- ✓Built by Gree — the factory behind much of the industry — under its consumer brand
- ✓Around $799 with a 16 ft lineset included, undercutting most rivals
- ✓5-year whole-unit warranty is simpler than the usual split terms
- ✓22-36 dB indoor range is genuinely quiet for the price
- ✗19 SEER2 trails the efficiency leaders by a wide margin
- ✗-13°F rating rules out primary-heat duty in truly cold states
- ✗Still requires flaring and evacuation — not a DIY quick-connect