Have the same problem in the upstairs of my house (also in UK) - still unbearably hot at night, even when it's cooled significantly outside. It seems houses he

Have the same problem in the upstairs of my house (also in UK) - still unbearably hot at night, even when it's cooled significantly outside. It seems houses here are built only with heating in mind, rather than cooling. I get that in much of the UK they need heated a lot more often than cooled, but it makes for pretty horrible summers.