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Keeping a mini split clean and sanitary
As a service technician I see more ductless systems every year. They certainly aren't my favorite thing to have to work on. A common problem I see is heavy buildup of of black "biological growth "on the inside of the indoor units, especially on the blower wheel.
We currently clean these units with a bib kit, and pump sprayers with a chemical solution in it. The process would work better with a coil jet sprayer, but either way it can be a messy time consuming job.
Is there better way to clean these units? I've looked into ultraviolet lights as way to prevent contamination. Some units such as Carriers have a self cleaning mode built in, but that requires the homeowner to use it. That never happens so I'm still unsure of its effectiveness.