I presently have aluminium framed double glazing (standard glass). I would
like to upgrade to Pilkington K or equivalent and helium gas filled. I have
been quoted over £2k to do this! Are there any products out there that can
decrease the thermal conductivity but won't cost the earth? I've seen films
you can apply but these make the glass very reflective and so they look
Have you actually worked out what difference it will make?
I suspect they payback period will be enormous, longer than
the life of the windows, so you aren't likely to save any
Converting single glazing to plain glass double glazing
knocks about 45% off the heat lost through the windows
(although this isn't permitted since April 2002).
In most circumstances, such double glazing won't pay for
itself in its lifetime in terms of energy savings (although
there are other reasons to convert). note that heat loss
through windows is not normally the largest source of
heat loss in a house anyway.
However, if you already have double glazing and want to
convert from plain glass to low-E, you're only looking
at about an extra 22% being knocked off the heat loss
through the windows, but are likely paying much more than
22% of the total cost of replacing the windows, hence the
payback period will be vastly longer than the life of the
windows. So if there's some other compensating reason,
that's fine, but you won't come anywhere near recovering
the cost of replacing the glazing in energy savings.
Just about anything else you could think of for reducing
energy losses would be more cost effective (and likely
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