Once only found in mild climates, the technology now stretches across the U.S., thanks to advances in inverter technology and zone controls. On the other hand, the level of sophistication in these systems sometimes makes them difficult to troubleshoot when something goes wrong.
source https://www.achrnews.com/articles/140610-training-is-huge-when-it-comes-to-troubleshooting-mini-split-systems
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