Sometimes the damper on the fan needs to be closed more. Check and see it's position. If it is all the way open, sometimes that can let too much air in when the fan is off, and your temps can rise. Choke the damper down to half way open and temp control should improve.
Thermopen DIY pit controller 12 volt lithium battery to power DIY pit controller in absence of outlet Eggcelerator Wok Spider Dutch oven paella pan CI pan swing rack two pizza stones two pizza peels 6 pizza serving trays plate setter split fire bricks Assorted specialty spices and... BGE salt and pepper shakers.
Wow, I spent a lot more than I thought before this thread.
I have not had an issue with maintaining temperature, or getting the egg very hot for pizza in winter weather. In fact I just pushed the snow off our egg this evening and it fires up and holds temp just like always.