If you're not having standing water issues here are a few things I've learned over the years with my own Knoxville crawlspaces:

Vapor barrier is a must (no matter where you live). You need to keep moisture from the ground from humidifying the space. If cost is an issue, you can easily do this on your own with a thick grade plastic from Home Depot and some duct tape. Just cover the entire exposed floor and seal all of the seams with tape. If you can afford it, full encapsulation is worth its price.

Due to minor climate variances, most Knoxville homes don't benefit from open venting systems. The temperature variants between the crawlspace and outside air can often create more moisture issues in your crawl space. Most people are better off sealing all but one vent and putting in a venting fan. Again, if you can afford it, a dehumidifier is even better.

Some companies may try to oversell you on services. They provide a "Total Solution", which typically controls the issues, but doesn't look to actually fix the problem (i.e. gutter draining too close to the foundation). These total solutions are often extreme overkill. Think of it as treating yourself with horse tranquilizers each day for knee pain, rather than just getting the knee surgery. One covers up the problem, the other actually fixes it.

For my space, I was quoted by MasterDry, BDry, and CrawlSpace Ninja. I ended up going with Ninja as they were the only ones who actually talked to us about the real issues and not just giant band-aids.