On 12/25/2011 12:55 PM, leza wang wrote:
i have 2 old windows upstair in my 1.5 house. they both old and i see
now water inside them (please see http://imageshack.us/photo/my-images/26/img0857wa.jpg

it is like when you put a glass of cold water outside in a humid day
in the summer. how can I fix that? i thought putting humidifier would
help but i also thought humidifier should only be used in summer time
not winter.

please advised and thanks for all of you.

Looks like double paned window where seals have given way.
There are people that will reseal them for a relatively low price but
you might consider a new window.

You're thinking dehumidifier. Usually house humidity is low in winter
but you can still get condensation on cold surfaces.