I explained it in my post. My room stays about 75-77, too cool in my opinion to rely on the heat tape to do anything for ambient temps.

The big 6-tub rack is controlled by a Herpstat II, which has two separate outputs. One side is set at 95(the probe is in a tub over the heat tape) the other side is set at 84.5(probe also in tub over the heat tape). Works great this way and the snakes thermoregulate regularly. Everyone is still eating weekly(except for Amani, but she IS the queen afterall, she's just on every 2 weeks now) and doing fine. They are normally found on the warm side or stretched across the whole tub. They move their hides as needed .

In the smaller rack, the 8-shelf one, the 3" is the hotspot controlled by a Helix set at 95(probe is taped inside an empty tub). The 11" acts as the cool side and is always between 83.5-84.5. It is controlled by a dimmer, that is then plugged INTO the Helix. I dial it down a bit and the temperatures stay perfect. They never fluctuate. Just in case the dimmer fails, it's still connected to the Helix which won't let it get above 95 or so, meaning the snakes would be fine until I noticed it.

So! Instead of heating the room like most people do, to 82-84 degrees(or whatever), the heat tape takes care of it for me. I'm moving in about 2-3 months or less, so the snakes will have their own 5x12 closet that will be heated and humidified to their content.

The baby racks are small enough that the 3" takes care of it. Cool side stays around 80, hot side is 95. The babies are quite happy