If you want need to run something for the entire room to maintain ambient temps vs ambient temps and hot spot you want to use a oil filled heater with a reliable external t-stat. This is the safest method baseboard heaters are not safe.i am
jist wondering why power was still supplied to the tape if it was getting hot enough to melt things? I use the stuff but am thinking of trying to get away from it, as it kind of worries me. Not sure if I can though. I am thinking about putting radiant heat in a small room, the size of a walk in closet. The animals wouldn't get a hot spot though and I am thinking the temps in the room would have to be about 85 degrees.
Ambient temps alone can be done I do it 8 months out of the year on average and only use ambient and a hot spot during the winter. I use what works with the room and since the room gets in the mid 80's during the warm months rather than cooling it and providing a hot spot I just cut it off the AC and use the heat to run my snake room free most of the year.