Would you install air conditioning in a dormer loft conversion?

[Homerenos1]

We are getting a dormer loft conversion in the summer. 1930s semi-detached so will become 3 storeys.
In two minds on whether we pay extra for aircon.
Anyone who has or hasn't installed aircon and whether they regret it?

Definitely. Our bedroom is pretty much in the roof space and it used to get boiling, to the point we would need to drag the mattress downstairs in heatwaves. We got Aircon installed March and I think it's the best money we spent - I am in a duvet in bed with it on now!

Probably depends where you live but we are in London and it is absolutely essential.

We have a Victorian house and I upgraded our insulation in the loft conversion (done last year) because I wanted to minimise AC use. We also have a rooflight over the staircase and windows front and back for a breeze. And even with all this the AC is still essential - it would be unbearable up there without it. We have a guest bedroom and a home office up there so it is used during the day mostly and sometimes at night. Again if it was for occasional guest use only I might chance it but even for resale it’s worth considering.

Fwiw our two units (1 per loft room) were about £4k Inc installation last year. It costs more to retrofit.

ETA - by upgraded I mean we paid more to have insulation beyond the minimum required by building control when we did the loft last year.

We did this - it's portable and we've only used it a handful of times in the last 12 months but for nights like this it's absolutely worth it. It was 32 degrees in our loft bed room 2 hours ago when we turned it on. I've just come up now and it's a lovely cook 23 👍🏻

And to add, we had our loft redone last year and it's properly insulated but it's still an entirely different climate to the rest of the house (Victorian detached). We have solar panels which are working wonderfully in this heat so it isn't costing us anything overall. We're in the NW.

Our basement on the other hand is utterly heavenly right now