2 t-stats? one for cool side and one for hot side?

[kitedemon]

Any UTH needs a thermostat. Whether you choose to have a UTH for the cool side or not is up to you.

Just to be clear most off the shelf UTH absolutely need so kind of regulation. However there are some on the market that are designed to never get over 90 and some will not get much over 80ºF.

If you are planning on a second UTH My personal advise is two fold use a T-stat to control it. Choose a lower wattage unit that is not going to get dangerously hot even if your t-stat fails, and use a fail-safe system.

Just call me Mr. Overkill...