Beer garden is probably the best place for this question as most of you will think I'm drunk when asking it....but I know as much about double glazing as I do about gas boilers and that's nowt! So, here goes and please don't laugh if my ignorance is obvious.... We just replaced in the last few weeks, single glazed wooden bedroom windows with UPVC Double glazing......., in fact all the upstairs are now double glazed. We have a conservatory on the ground floor which is double glazed too. My previous home had DG throughout. When I get up in the morning now I see the bedroom windows covered in condensation - On the outside -, not between the void, not on the inside pane, but on the outside like dew has settled on them. Never had this before in my previous place, didn't happen on the single glazing, doesn't happen to the conservatory which is facing the same direction as the bedroom windows. We've not had the central heating on (yet) although I suggest it is obviously warmer inside than out. Am I so doodle-ally to be so dumb into thinking this shouldn't be happening or is this something I should expect as the temperatures drop for Autumn and this is actually Nature working in its finest mode? It's just odd to wake up to see condensation on windows like I did as a kid with metal framed single glazed windows in the 50's and despite having DG in the last house, we only ever saw condensation on the windows when the seal went between the glass panes. But that was on the inside of the double glazing not on the outside. Am I having a belated vacant Friday 13th moment or is there someone who can tell me there's something amiss with these windows? I know the car gets dew on, but that I thought was somewhat different and it's not Double glazed...Am I crazy or what? Any help proving my sanity most gratefully received.... A1