Hi Dave
I have no idea, i guess one of those thermostatically controlled units might do the trick ? does anyone else use one to hatch out their queens.
After working the hives at the weekend i ended up with a dozen sealed cells that i cut out the frame & brought home with me, i stuck them to the underside of a honey jar lid using melted wax, 1 cell to a jar, as rather than just squash them, being the curious type of fellow i thought it might be fun to see if any hatch out.
They are in the airing cupboard, but i dont think the temp is high enough consistently for a positive result.
Was wondering what people have used on here ?