RCG did a similar post on this not so long ago.

Over the weekend we have a few customers contact us about condensation on the outside of their windows after having A rated windows installed. At least we know they are working! But this is an issue we are now starting to explain when demonstrating the product to customers from the outset.

But it could turn into a bit of a sticking point. Customers hate a bit of condensation on the inside of their windows, so I’m sure they aren’t going to appreciate waking up in the winter to fully condensed windows.

SIGN THE WINDOWS SCRAPPAGE SCHEME PETITION NOW!: http://www.petitions.number10.gov.uk/windowscrappage