Greetings Melissa May,
Condensation is formed because the moisture inside your home, in the air, comes in contact with a cold surface.
By opening the inside windows, you are allowing the moisture in the air to settle on the glass of the outside pain.
This moisture is not just on your windows, it is also in your couch, curtains, and carpet.
The greater the tempreture difference between the inside of the home and the out side of the home will make this problem worse.
If you are getting Water/condensation in between the windows, it is because the inside window is not sealed properly and is allowing the inside moisture to get past.
You should try to locate where the water is coming from and stop it at that point. These areas are common in a bathroom or kitchen with no outside vent.
You said that it is a new home so you should have a bathroom vent. Do you use it?
Do you use a teapot or boil water for coffee?
Aquariums pump the water and so does having alot of plants.
You should try useing a dehumidifier to see if that helps.
Post back if you still need help or to let us know what works.
ps.. you might want to do a "search" on condensation
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