I hate being woman LOLLLLL

For q5, can anyone explain?

I have the feeling that the comparison can be implied between "very cold days" vs "not very cold days".

So, when answering the question I was thinking:

1. things being compared - "very cold days" vs "not very cold days".

2. quality being compared - indoor temperature

3. winner - "very cold days" (bc lower temp on other days).

Why is this reasoning incorrect?