Best Window Air Conditioners of 2026: Midea, Zafro, GE
- Photograph: Chris Null
- Photograph: Chris Null
Optima Series 12,000 BTU 23 SEER2 Ultra Heat Mini-Split AC
Heat pump technology keeps getting more accessible, which is terrific: It's far more efficient than air conditioner technology as a means of heating and cooling the house. I'm still waiting for window-unit mini-splits to become available, but in the meantime, mini-splits like this Della can now be ordered at less than $1,000 on Amazon, installation very much not included.
WIRED reviewer Chris Null tested the Della Optima Series 12,000 BTU 23 SEER2in his Texas home, and found it performed well at an excellent price, with admirable features despite a couple rough edges. It's quiet, never more than a whispering 40 decibels. The app is intuitive and allows scheduling based on the time or day of week. The unit also supports Alexa and Google Assistant, though without a logging system to track a running...
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