One thing that may help would be to insulate the outside of the rack. It is actually quite simple to do. Just use the insulation that you use on the outside of a house. It has the reflective foil on it that really helps to trap the heat in the rack. Screw the insulation boards to some wood panneling, (the lighter the better) and fasten it to the sides of your rack. The idea is to keep heat in, and cold out. That way the ambient temp can be raised, without over heating the floor of the tubs.

Remember to have the foil facing in towards the rack.

It should be relatively inexpensive, since you should only need the thinner insulation to make a considerable difference. If you need even more insulation, you can do this to the back as well, but make sure that any cords running out the back have ample holes to go through. (A keyhole saw works great for this)



Hope this helps!
-----
James.....

"Curiosity killed the cat, but satisfaction brought the beast back."

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