I will keep my eye out for small heaters and lights.
Steve where do you get your plastic wrap?
I thing though about electric, I have remote controls for them. One will be on a pipe heater thermostat this year to see how that works .
Depending on the winter of course, I may have the lights on for more than 10-20 nights and just a couple of whole days. Of course now that I have said that it will be the coldest winter on recorded.
I will post a picture of the top laterals next week. It will be "T" shaped so no water can collect on the top.