I agree and wouldn't advocate using an oxidizer like H2o2 on alum either for the same reason,
but its fine on the tube blower which is some kind of composite material.
I'd have to differ on std. split systems being preferable.
and it's a very subjective blanket statement on your part i don't see how you can back up.
many variables can figure into deciding which to use.
the larger the room the more desirable the std sys. becomes.
pros-n-cons on both sides of what to pick tho.
as said above regular cleaning of the blower and filters isn't a big deal and my specific prob was an exception not the rule as you can see by the lack of people posting mold growing to the point of stopping airflow or as you said effecting efficiency which in the case of mini splits I see a much high seer rating and the inverter compressor technology make them very cheap to run.
also another **prime reason** if not the most important mini splits are preferrable to the smaller-mid sized residential grows is the extremely low noise factor... having your AC condenser unit running near constant year round gives neighbors a big reason to be thinking too much.
a standard sys. cannot even begin to compare in this dept.
of course I can't pull stats out on how many use mini splits or std split sys. but I'll wager very few std. sys. are used compared to mini split systems in use by member that frequent gro sites
like IC RIU etc etc
a quick search in this forum will tell this by looking at the number of people installing mini's and how few are doing otherwise.
personally a std. split ac is the only way to go for larger grows.
btw...living in the very hot-n-humid deep south and doing repair work for a living all my life i can say condensate lines and drain pans can and will plug up on a std. ac as well as a mini split.
