Microguy. I would suggest looking at the Dometic exhaust fans. They move a lot of air. Mine are not on a thermostat, so I put each one on a separate switch so I have the option of none, some or all. There is also a thermostatic exhaust fan (two fan set up), that will turn them on low at a set temp and increase decrease the speed as is needed. All of these fans are very low battery drains. If you have problem finding what you need, I'll be happy to go searching again.
