The first thing is you get condensation when a wall is at or below the dew point for a given humidiy level it does not tell you much about the amount of humidity and more about the ambient air temps. They are clearly too cool. The isse with tubs is the only good safe way to raise ambient air temps in them is to raise the room temp. UTHs are radient heat sources and heat objects not air. The gain is very very small a few degrees at best. The best bet is to give up on the tub. There are plenty of options that allow for covection elements to be added that will actually heat the air. The best option on a budget is a side turned tank. With the addition of lighting mine easily hold 15ºF over ambient room temps. The very best I can manage from a tub is 2-4ºF over room.

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