The rack system has heat tape attached to it on the back bottom of the drawers for the tubs, my particular rack system has 2 rows 4 inch strips per drawer which helps with the coldness of my room, I'm A little lazy to post a picture of my own heat tape but here is a decent picture of a single row of heat tape setup.
Keep in mind that the heat tape is hooked up to a thermostat which has a probe taped to the heat tape to control the temperature.
These are amazing! http://spyderrobotics.com/home/products.html
These changed my life from always worrying if the temperature was correct using an analogue
thermostat and an additional low accuracy digital thermometer.
I was literally fretting over it daily!
![]()