Or add a small heating element, but it's not been necessary so far, it would probably need a full week below zero to freeze. I do some minor adhoc regulation b

Or add a small heating element, but it's not been necessary so far, it would probably need a full week below zero to freeze. I do some minor adhoc regulation by putting leftovers in the fridge when they're still piping hot on colder days, vs letting them cool down more on warmer days.