Hi there -- Thanks for your question. FWIW, I've never once heard this particular concern with regards to a Tempur-Pedic mattress. Perhaps your source was confusing this for a Sleep Number? There have been some mold/mildew complaints related to the vinyl air chambers, which is more a function of the inherent design of an air mattress.

More generally, IMHO I don't think you have much to worry about with putting a Tempur-Pedic mattress on a Tempur-Pedic base. As an added reassurance, in the worst case in which something were to go wrong, using a base from the same manufacturer (especially an adjustable base, which effectively functions as both the foundation and the frame) removes one of the bigger areas of wiggle room that manufacturers sometimes use in honoring warranty claims.

That said, if this still concerns you, you can go with just about any slatted base foundation, of which there are countless options on the market. Just make sure to get one whose slats are no more than 3" apart. Unfortunately, I'm not aware of any adjustable bases that use a slatted construction -- the vast majority, as you pointed out with the Tempur-Pedic, use a solid platform instead.

I hope that's helpful.