I pay for a reputable hvac company to come out 2x a year to look at both our whole home hvac system and the mini split in our enclosed lanai. I pay $300 a year for this service and they spend over an hour doing both units. I watch them and they get into the inside of the units and really do a good job cleaning the coils and drain lines, plus clean the outside units.
Also there are multiple kinds of mini splits to buy. If you want the big ugly wall units, then these will be in the $5-$6,000 range, but if you get the ceiling better looking units, you will spend $1000 more.
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