The problem is that as people have added A/C units, they've cut openings of various sizes and shapes in the siding, and covered the openings with wire mesh. It looks terrible, and these homeowners will be paying for the replacement of the siding.
The question is how to replace the siding and how to include venting that is not unsightly. A long time ago we were having problems with moisture under the decks, and installed 24" high x18" wide aluminum vents in the siding, and painted them to match, and it looked fine, but these vents don't let in enough air, or let out enough exhaust, for an air conditioner, so whoever installed the air-conditioner removed them.
I was thinking of some large louvered vents made out of aluminum, like 24" high x 48: wide that we can paint to match, but I can't find anything like that. I can do three 24" x 18" side by side, on each side of the deck, but that is a lot more work.
I know that I can order custom extruded aluminum louvers in any dimensions, but I'd like to stick with standard products.