I've developed a system of tiny automatic temperature adjusted fan/heater combinations in each hive. I need a minimum of 5,000 and the larger hives need more, up to 60,000. They are automatic, when the hive is too hot those little fans turn on, and when it is cool out the heaters will turn on, adjusting speed and heat to the conditions. They are honey powered, so don't require cords, wires, or solar panels. :-D
I'm working on getting a patent for this system. :roll:
(I know, assist, but I couldn't resist! All 9 hives made it last winter all by themselves, I'm not going to worry about it!!!)