Well how do you suggest getting ambient temps up ? My house stays 75 degrees at the very most. Uth does not bump ambient temperature up. Just that one spot gets warm. I don't know about rack systems they are probably more effective in that case. And seems like a heater emitter would do the same as a bulb. .... Snakes are both in shed and humidity was at 16. Furnace is also drying up the house so that just made it worse. Humidity has been stable at 65_70% since yesterday. So it kind of does make a difference what you use. Lol