Hi. I live in a rented flat which has very old, single glazed windows. They are constantly covered in mould and the window in the children's bedroom is now leaking. There is actually a 2-3cm gap when you try to shut the lounge window as it has now fused and you cannot shut it all the way. Because of this there is a constant draught and the heat quite literally goes out the window. The wood surrounding the windows is eroding and they really are in a very poor state. Thankfully the rest of the flat is fine. AIBU to ask my landlord to upgrade to double glazing? I'm not sure they even meet the EPC rating. I am a single mum of 2 young DC in the middle of a university degree and unfortunately not in a position to move at the moment. Thanks for reading.