If you need heat, you can use one of these:
bayite Temperature Controller 1650W 15A BTC211 Dual Digital Outlet Thermostat Plug, Pre-Wired, 2 Stage Heating and Cooling Mode, 110V - 240V, Fermentation BBQ Reptile Aquarium: Amazon.com: Industrial & Scientific
www.amazon.com
Plug your heater into the heat outlet and your ventilation into the cool outlet. You can really dial in the environment with these. I haven't been using them lately though as since I re-ran the heat duct, I no longer have a cold basement issue during the winter months.