I used full room heating back when I bred in the nineties and had excellent results, and I use it now as well, using a low profile convection heater. Never had egg binding issues, had large, healthy clutches, and had good success. I do believe though that a thermal gradient IS the best way, if you are able to afford or build racks with heat. Not everyone can afford racks such as those, but if you can, I would highly recommend it.

Since I keep pits mostly, my temps are slightly cooler, varying from 81 to 75 all throughout the day, more often being in the upper 70s. Kings are kept higher in the room, while pits, depending on species, are kept accordingly in various areas.

Since I have stopped trying to have one steady temp all of the time, I have had also much better growth results, within the past year especially, when I started doing nightime drops, and then allowing the heat from the house to heat up the room, thus having slight temp changes throughout the day. My point is, I am having really good results having the temps fluctuate, instead of just one solid temp all of the time.

Just my experience.
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Genesis 1:1

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