We've just had four new doubled glazed windows fitted. On a damp morning you
can't see out because of the condensation on the outside of the glass. I can
go out and wipe it off but it just comes back, a bit like condensation on
the inside of single glazed windows. Is this normal? I have four older
double glazed windows that are completely clear. If I complain am I going to
be told that they are so thermally efficient that the outer pane stays very
cold?? Thank you
If it's Pilkington K glass then less heat is lost to the outside so the
outer pane is colder. I had new DG windows installed this year, with K
glass, and on some mornings some of the outer panes have condensation on the
outside. It has always evaporated so far. It's when you get condensation
inside the sealed units or on the inner surface of the inside pane that you
need to get worried!
I had a new backdoor and window put in roundabout May this year. I have also
noticed over the last few days when mornings have been really cold that
condensation is on the outside of the glass. I'll have to give the |DG man a
call and find out why.
Havnt you seen condensation on parked cars in the morning? Or dew on
the grass? Condensation forms on any cold surface so that means your
windows are cold on the outside which means they are insulating well
Because they are radiating more heat than they are receiving,
which is the same reason any surface can be colder than the air.
Conduction to the air is not the only heat transfer mechanism.
An object at, say, 276K is going to lose a lot more heat out
into space at 3K than it is going to receive back. This is no
different to an object getting hotter in the sun than the
surrounding air temperature, only the other way around.
You are probably wasting more heat than the OP keeping the
outside of your windows warmer.
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