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Fujitsu XLTH: https://www.fujitsugeneral.com/us/residential/technology/xlth-low-temp-heating.html https://www.fujitsugeneral.com/us/residential/technology/xlt... Mitsubishi Hyper Heat and H2i Plus: https://www.mitsubishicomfort.com/articles/what-is-a-heat-pump https://www.mitsubishicomfort.com/articles/what-is-a-heat-pu... Efficiency with these heat pumps severely decreases when temps go below 0F, but they still produce heat. Their sites are admittedly not all that clear. GreenBuildingAdvisor.com has a ton of useful info on it, like https://www.greenbuildingadvisor.com/question/cold-weather-performance-reports-from-minisplit-owners https://www.greenbuildingadvisor.com/question/cold-weather-p....