I bought the below rack from Reptilebasics. for my BPs. It has back heat and works great (90/80) during the summer . However, the winter temps in the room where the rack is can get as low as 60-62 F. So I am slightly concerned that my cool side temps will get too cold. I have come up with two solutions and wanted to get opinions on which would be better. (I have a herpstat pro)

1) Get an oil filled space heater from lowes and run it on the herpstat to maintain 74 degrees in the room where my rack is.... This should allow the 90/80 to be maintained.

OR

2) Get some flexwatt and place it under the cool side to maintain 80 on the cool side.

I assume the flexwatt option would use less electricity, but the space heater may allow for a more overall temp maintaince.

Thoughts? pros or cons? other options?