Quote Originally Posted by HanabiraAsashi View Post
Not exactly true. If you take a heating blanket, turn it on high and put your hand over it, you'll barely feel anything unless you are directly touching it. Sure there is some heat coming off of the UTH, but it isnt nearly enough to maintain ambient temps.

Sure, another UTH with cool side temps will work because the snake will be in contact with it, but it is different from raising the ambient temp.
The temperature of your hand is going to be much higher than the desired temperature range for a cool side of the enclosure. You wouldn't be able to feel the temperature change anyways. Don't rely on your hand to measure heat. Also, you have to consider the ratio of overall floor space to the space covered by a UTH. Unless your heating blanket is 1/3 the size of your room, the analogy doesn't really work.

The heat produced by a UTH does not simply stay on the floor of the enclosure. It dissipates to regions of lesser heat energy. With an insulated enclosure, and provided the room isn't below ~70 deg you would be surprised at how much the UTH contributes to achieving appropriate ambient temps.

A cold side in the low 70s high 60s isn't an emergency. I often find my snakes preferably choosing spots in the enclosure in the 70s. The WHOLE point of providing regulated heat in a reptile enclosure is to allow the reptile to achieve a given body temperature. If they have the means to do that, that's all that matters physiologically.