> Double and triple glazing of windows and doors prevents the
> leakage

Why do you think double and triple glazing prevents the leakage better
than single glazing? Does air penetrate glass?

> These days, the glass in double glazing can be specially tempered and oft=
en
> an inert gas is now used to help keep cold air out during winter and
> preventing hot air getting in along with preventing infra red radiation.
>

Inert gas and tripple glazing serve noise insulation as far as I know.
Infra red radiation is handled by Low E film for windows. But at 10C
temperature difference (NZ) the heat leakage by Infra red radiation is
quite negligible.

I suspect that energy spent to develop and apply some advanced heat
insulation technologies is greater than the energy saved by using them
:-) (not the case for cold climate countries)
--=20
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