Your experiences with vinyl flooring - clicking or gluing?

That many cm would worry me. Maybe a few mm per side, yes in summer one should not let the sun hit the ground too much. Shading should be possible.

In summer, you shouldn't let the sun hit the floor so much. Shading should be possible.

no - I have an acquaintance who basically always has the roller shutters almost completely down - so that the parquet doesn’t lighten. It’s terrible, because there’s beautiful sunshine outside, and you sit inside with a lamp on... never.
I wouldn’t want a floor that can’t handle the sun because it then expands too much, or I would complain if it was installed without my consent.

We will have full vinyl planks glued down. 99% sure anyway, no experience yet of course.

Bonding saves energy and is therefore preferable for underfloor heating. In larger rooms, the risk associated with expansion is also eliminated. Additionally, only bonded vinyl is 100% truly resistant to moisture. There is very, very little that speaks against bonding.

I will expand the question to include the preparation, I also want to install vinyl but am not yet sure what the substrate should be like. We are getting a calcium sulfate flowing screed which levels itself to a large extent and should already be very even. Did you still putty or apply a leveling compound then?

I can't tell you, a company did it for me.

We have adhered full vinyl without carrier material as planks. What kind of screed we have, I can't say exactly at the moment. In any case, a leveling compound was poured and spatulaed at the edges and transitions. Looks great.