I agree with MrLang. Currently my BP is in a glass tank 36x12x18. The screen top is covered by foil for all but maybe 4-6 inches on the hot side. I bought a repti fogger for misting which was a waste. I thought it would help with humidity but it's useless when it's on it's lowest setting the side it enters spikes the humidity drastically before doing anything to the other side. I have a 8x12 UTH for the hot side. Since the tank is so tall I have a 60w IR heat lamp which runs all the time and maintains 89-92 ambient on the hot side. I have a 100w ceramic heat emitter in the center which is on a thermostat and warms the middle and cool side to 77-80. When the room temperature rises above 75 then the 60W IR is eliminated and only the ceramic is enough to maintain the tank. Humidity is done through a spray bottle a few times a day for the time being.
Now I just finished a 3 tub rack utilizing 4" flex watt. The tubs is about 22x16x7. This is a small enclosure and while testing it out the hot side hit 90 and the cool side raised about 1 degree above ambient if that. I am currently searching online for a room heater before the final set up and the BP is transferred over. Mind you this tub is fully enclosed and the flex watt did nothing for the cool side. As for humidity I had reptibark so added some cypress (apparently waaaaay too much) Humidity hit 99% so the substrate needs to be re-worked too.
As for the A/C vent I would close it off and cover it if possible. Remember cold air drops. A good residential A/C system drops the temperature 15-20 degrees. That means if your home is 72 the air coming out would be 57-62 degrees.
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