Decrease the inside moisture level or increase the tempature of the glass.
It is simple physics. Just the same as condensation of beer bottle in the summer.
Two things that will raise the tempature of the glass is to install storm windows or replace the windows with ones with insulated glass.
Also if you have window covering that will allow the air to move between it and the window will cause cold spots and condesnation. Opening the window coverings will help.
To help on the mositure side use vent fans more when bathing and cooking.
It helps to give some more details.
Type of contruction and age of the house.
Location.
Any weatherization that has been done in the last couple of eyars.
Replies
>> we do use fans when cooking.
Do these exhaust to th eoutside or they just recirculate? makes a difference.
>> i think ill start leaving the blinds open at night
Closing the blinds creates an additinal insulation layer (keeping more heat inside the house) at the cost of causing condensation. Opening them minimizes the condensation but you lose moe heat through the glass. Talk about a tradeoff. I personally often opt for the former. On very cold nights just go around the house once with a towel for a quick wipe.