Air con vs new window or something else

[Whatatodo79]

My toddlers bedroom is in the extension part of the house with the sloping ceiling/eves all along one side. Quite a big room with a window at one end. Because it's basically in the loft it's not like we can put any insulation in and it's chilly in the winter and blazing right now. 25-30 degrees showing on the baby monitor. Obviously he's not sleeping well. What would be better for temperature control - i thought maybe a Velux window we can open when hot punched into the roof side, or even an AC unit? I guess both are going to be pricey

You could put thin kingspan in along the sloping ceiling. You'd lose a few inches and it would make it much warmer. Not much you can do in the summer. A velux would allow a draft through by having two open windows at each end so it would cool down faster, and painting the tiles with white roof paint would reduce the temp by a degree or two.

Yep, as per pp, internal insulation on ceiling and any external walls. and an extra window to achieve a cross breeze. Velux's are quite affordable. Shading outside any window that gets direct sun (stick a piece of shade netting to the outside of the window). Hard floor, and add a rug in winter. Thermal curtains. Ceiling fan.

It's only going to get hotter. AC is about £3K fitted per room. It's very much worth it.

For a temporary solution, you can get a portable aircon unit for about £200 ish and it makes a big difference to the room temp - we have rooms in the loft too and it drops the temperature by several degrees. Only downside is it's a bit noisy, but you can always leave it on for a few hours with the door closed and then turning off at bedtime.

Insulation will help with heat as well as cold. So will changing any windows to double glazed. And adding blackouts so you can stop the sun coming in.

A velux is a good idea if it will be N or E facing but if it will it be S or W facing it may just let in more heat.

A/c - a portable a/c unit could be pretty effective, you’d need somewhere to store it when not in use, and a window adapter kit. But I’d do the insulation anyway- will help the a/c work less hard and so cost less, also will help in the winter.

I would get AC if you can. I paid 5.5k last year to fit it in 3 bedrooms.