Insulating the sides and back of the box is important to minimize the loss of solar heat. If you are handy with tools, build a hinged insulated cover with reflective foil to direct more of the sun's rays on the tank. Close the insulated covers at night or just throw an old quilt over the clear top. Update Bulletin No. The program was technically correct, but misleading.
Relative humidity is dependent on the indoor air temperature.
This may result in mold problems. Reduce the humidity level as it gets colder outdoors.