So i woke up to my herpstat beeping....I go and check on it and the temp is low. I check out the rack and the built in heat has gone out. The heat source was built into the shelving. I was wondering how to to rig something.The rack itself is 1/2 in XPVC. Would putting heat tape on the rear exterior heat it up enough for my BPs? Looking inside there are no gaps on the side or back of the shelves. Would cutting into the shelves a bit hurt the sturdiness of the rack?