How do I stop my upstairs from getting way hotter than downstairs?

Posted by Food_Cats1@reddit | AskUK | View on Reddit | 217 comments

This is the first time I'm living in a house during a heatwave and I swear the upstairs gets at least 10° hotter than the downstairs (if not more). We open the windows in the early morning and close them before it gets hot. We also close all the blinds during the day but keep fans on for air circulation.

The thing I just noticed is that the airing cupboard is SO HOT and I think that is what's making the house unbearable. Is there anything that can be done about this?

For context: we are renting and I will call the lettings agency later today and see if there's anything they can do, but I'm worried they will tell me to deal with it. We have two cats who refuse to spend the day downstairs, and I worry they're going to overheat. I'm also pregnant, so I'm really struggling with this heat. I spend most of the day downstairs, but our only bathroom is upstairs and the bedroom is upstairs as well (I often need to take naps because I get exhausted during the day).