i have a similar coke machine ( paid 100 for mine ) but i can actually turn it back onto use as a cold drink storage lol. but i ran a single piece of 3( or 4 ) inch tape from top one sidie to the top of othe side ( in a large U shape.) it works great at keeping the 88-90 temps I wish for . I am on my 3rd year using it with no problems I hang my probe betwee nthe middle of the shelves so it give me a rought avg temp. but i also only use a esu on off tstat. with a great success, ( I hatch more females than I do males lol