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I installed Bosch mini split system in our house early last summer. My units are rated to still provide heat function down to -13 F outside temp. We have had a relatively mild winter here in NW Ohio so it only got down to -5 once or twice. It still worked for us on those nights. Bosch has more expensive units that can operate in even colder temps, but we did not choose that option as -13F seemed fine for our climate.
We have ceiling and baseboard heating in our 60's split level home and only had window type air conditioners until we went to the new mini split system. It has worked perfectly thus far in both summer and winter. It supposedly is much more energy efficient to operate than our old all electric heat and window AC units. That said, we still have our old heat system and if temps ever got below the -13 f rating of the mini split system, our old system still works.
My wife pays our electric bills and I have never taken the time to compare usage from past years. With this mild winter, the numbers wouldn't mean much anyways this first year into it.
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