On Dec 25, 4:33*pm, bob haller wrote:
On Dec 25, 3:51*pm, leza wang wrote:

On Dec 25, 2:31*pm, bob haller wrote:

If its a double pane window replace the sealed unit. Its no expensive
in pittsburgh area you make appointment, take window and sash assembly
in AM and pick up in late afternoon.

much cheaper than a new window.

attempts to fix the seal are a grand waste of time

thanks for your reply, much appreciate it. what is seal?

the seal is the seal between the 2 panes of glass.. its generally a
rubber like gasket material that usually keeps the outside air from
entering between the 2 panes of glass.

If it's what we think it is, then it's 2 panes of glass that
come together and function as a unit. The seal is what
keeps air and moisture from getting between the two
pieces of glass. Once that happens the solution almost
always is to replace the unit. Whether that can be done
by replacing part of the window or the whole thing depends.

As for humidity levels in the house, you want to keep
that to 40% max in winter which should be OK to about
30F outside or so. As it gets colder outside, you want
less humidity inside so you don't get condensation on
the inside surfaces of windows, recessed ceiling lights,
inside walls, etc.





the seal doesnt last forever when air enters as barometric pressure
changes moisture enters too, and you get condensation on the inside of
the glass unit.

a local window repairman can come out disassemble the sash and measure
the sealed glass unit, then return with a new sealed unit.

on older windows the big hassle is getting the frame apart that
surrounds the sealed unit.

thats best left to experts to prevent frame breakage