I used to live with my dad who wouldn't turn the heat on in the winter. My snake's tank did fine, though! I put foil on the screen lid but cut a hole where your heat lamp or any attachment is. This also allows airflow cause you don't want to COMPLETELY cover the lid.
I also purchased foil insulation and wrapped it around the back and sides. His tank never had a temperature problem after that, even on the coldest days. The foil insulation I'm talking about can be bought on amazon for about 20 bucks. It's a bubble wrap/foil insulation and worked great for me!
Since I've moved in with my boyfriend we have a nice warm house and luckily for me, my boy doesn't need the insulation. It does work though! And I left it on during summer too so long as you have a thermostat. Saves a lot of power because it holds the heat in a lot longer so the heater isn't on as much and the thermostat makes sure it doesn't get too hot!
Hope this helped!![]()