MRCOOL DIY 18K Hyper Heat Mini Split vs Senville Elite SENE-18EL Mini Split

Both are 18,000 BTU cold-climate heat pumps that heat to about -22°F, so the real split is efficiency and installation. The Senville Elite is the more efficient unit on paper (25.6 SEER2, 16.2 HSPF2) and carries a 10-year compressor and parts warranty. The MRCOOL DIY is the easier one to install yourself: its pre-charged No-Vac QuickConnect line set needs no vacuum pump, gauges or refrigerant charging, and no HVAC certification for the connection. Owners of both lines praise cold-weather heating; the MRCOOL's weak spots are its louder indoor unit and the fact that DIY-friendly design costs some efficiency.

• Choose the MRCOOL DIY if you want to install it yourself without vacuum tools or an HVAC license, and you value the simpler pre-charged hookup over the last few points of efficiency.
• Choose the Senville Elite if you want the highest efficiency and the longest warranty coverage, and you have an installer or are comfortable with a conventional vacuum-pump setup.