Sort of defeats the premise though don't it?
Could be a slop 10 gal and dual sponge filter barebottom etc........since looks no longer matter much once you start sticking things in the Garage.
I have the same darn issues.........I have 440 gal worth of open tops, but it's the entire 1500 sq ft home and I have dual pane windows(get them if you do not have them). I have a pair of 10 gals slop barebottoms in the garage as well.
Best to custom make the tanks specifically to suit the space you have available in each location. Then make the stands. LeeMar makes very nice tanks and you can get them there. If you have all the tanks, well then you have live with what ya got.
You can use the semi gloss paint they use in the Kitchen and bathrooms etc........you'll still get mold though without venting or dehumidifying.
The larger the temp differences, the more mold/condensation you end up with.
I pulled 2-3 gal a day from the air.
Electric also added up. Venting the entire home is not a good option.
Evaporation rates will be pretty high, maybe 1" a day where you are at during normal temps in the 70-90F ranges.
The Delonghi 400's ain't bad.
If you wonder.........I've been through this a few times, it's no fun.
Too many open top tanks
Best to plan/think now rather than later and a huge messy moldy "I'm getting a Divorce" talks with the wife. Course I'm not married either
A sun room that can be vented would be nice.