Get a 60$ space heater with built in digital thermostat at lowes. Plug it in and set room temp at 81. Set the tub of eggs on top of the racks and thats it.

Ive never used incubators for colurbids eggs. always incubated at pythons room temp.

On other hand, i always tell people stay awya from hova bator. Theres more problems with them and more clutches are lost each year than make it