I have a garden window in my kitchen and when the weather turned cold I

noticed air infiltrating along the bottom edge. An installer came by
to fix it
and said it is a function of the window as it is outside the house and
the glass is exposed on 3 sides plus the top, and the air on the inside

is cooled by the outside and falls to the bottom of the window. The
glass IS double paned, but I do not know what, if any, gas is
insulating it.

Is this true that it is the nature of the window?

Thanks!!

Eddie G