The 'fancy' glass for conservatories that keeps the heat out?

[Katz]

Does it actually work? how much cooler are the conservatories?

we have
no idea
havent had summer yet

we live up north so summer may not actually ever be a problem - but south facing so gets hot even in the winter on a sunny day - but our windows are old.

bump

pilkington K glass?

no help
read that as conservatives which made me chucle to self.

This?

mj - thanks, we're just pondering what to do after our planning permission for a loft conversion was refused, conservatory would be a good solution.

It makes a significant difference...it's called Solar Controlled glass - lots of people do it; Reflex / Pikington / Saint Gobain to name a few.