Hello,

Today I came home and checked on the tub set up to see the temp. Today was a pretty cold day and there was no one at home (apartment) and the temp was down to 66 degrees, in the tub as well. 15 qt plastic tub, with 4 inch heat tape is all it has currently. No snakes right now, I am picking it up this weekend. I will be doing couple things within a week.

I am going to put bubble wrap on my room window. This window takes up 80~90 percent of the wall (pretty big big) letting every cold air into my room. I heard bubble wrap is an awesome insulator for windows during winter.
Also, I will be building close sided one level rack with melamine wood for just one tub, which I heard can help keep the heat better.
These are two things that I am going to do for sure.
However, I doubt that the ambient temperature in the tub will be on the safe side in cold days. So I really need your guys' advice from experience or knowledge on how to fix this problem.
I had some options in my head, and these options are considered after the five sided one level rack made with melamine sheet.
put belly heat tape on the hot spot and another tape along the side of rack along the cool spot, acting like a side heat. Or put belly heat tape on hot spot and another belly heat tape on the cool side set to 80 degrees. These options, I know require two thermostat.

In the summer, it gets pretty hot/warm here so I don't think it will be a concern. Winter is the problem, Colorado sucks in winter lol. When it is really cold, I do have an oil-filled radiator to heat my room as back up. I just don't want to run heater all day long, just cold days. I really hope insulating window helps because I feel a lot of cold air coming from that window when I stand next to it.

Please help me experts!! thank you so much in advance.