If the heater is under 1000 watts you could run it off a hydrofarm. personally I wouldn't trust a $30 thermostat with anywhere near 1,000 watts. I would use an oil filled heater (1500 watts) paired with a ranco thermostat
To hook up any heat source to a thermostat all you have to do it plug it in, and place the probe wherever you want to measure temperatures.
Breeding rodents is a lot of work, the questions that you need to ask yourself are
- how much is your time worth
- how much will food/caging/bedding/other necessary materials required going to cost
- how much will it cost to heat
- are you willing to deal with the smell of large numbers of rodents
Then compare that to the $900 per year for frozen rodents.