No amount of heat tapeis going to heat the ambient air enough. You need to get your room temps up to the high 70's. I was having problems with my first DIY rack until I realized that my ambient room temp was just far too low for the heat tape to make any sort of difference. I had a low hotside even until I bumped up the room. I can't see risking your animals by attempting to just try with a high 60's room temp. It isn't going to work.
Regards,
B
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