Ken
Just like Chick, I kept a space heater in the basement set at around 40 degrees to maintain the tanks from freezing. I also wrapped heat tape around the water manifold, water pump, and intake water hose. I bought a wireless thermo-hygrometer set with 4 transmitting sensors (
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1) which I placed throughout the basement to monitor the temperature. Doing the above served me well (and gave me peace of mind) during 3 winters in Washington State, not as necessary now that I moved to Florida.
Vic