Compared across 9 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission. Price via Klarna.
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The Keystone is a window air conditioner with an inverter compressor, which lets it run at partial power instead of cycling on and off. It cools up to about 450 sq ft, heats as well, and includes a remote, timer and digital display. Inverter window units are quieter and more efficient than fixed-speed models, and this one sits against mainstream inverter rivals on features rather than leading them. It suits people replacing an old window unit who want steadier cooling and less noise.
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Lowest price we've seen: $429.99 on Nov 10 at The Home Depot. Tracked across 9 stores since Nov 10.
Owners of Keystone inverter window units generally report quieter, steadier cooling than the fixed-speed units they replaced. Complaints center on build quality, occasional inverter board failures and weak heating.
