buy a mold and mildew cleaner with a encapsulate which will prevent mold and mildew and smells you can get them at home depot lowes or hardware stores spray everything down with that and let it dry wipe of excess and joila :D
you could make your own from an older refigerator drill a hole in the front and mount your tap handle and store the keg inside of the fridge here is an idea
http://www.rooftopbrew.net/?page_id=244
I had the same problem did all that amd it still didn't work so i ordered a heater element off of ebay and installed it and now i have to change the thermostat also
there is a lot of upkeep also i had looked into one and the installer told me they have to do an acid flush every year that cost between $150-$200 and that the certified installers are the only ones who could do this alot of maintenance
i am having moisture issues on my floor of my camp it is on piers and the bottom of the is open to wind and weather any help would greatly appreciated the floor is not insulated and i am worried about mice eatign the insulation if i do install that any help would be appreciated