The window is approx 36" high and 60" wide. It is double pane glass. The condensation forms on the outside and inside of the window and it runs down on the inside sill, which is causing the paint to bubble.

I can understand condensation on the inside surface of the glass but not the outside. Do you mean outside as in outdoors? It just can't be on the outdoor side unless it's raining.

Anyway... you need more air movement and less humidity. What is the humidity level of your house, where is the house, what has the high and low temps been lately?

Jaz

Do you mean it condenses on the inside of the pane and also between the two panels, if so you seal has failed. May be under warranty.

I can understand condensation on the inside surface of the glass but not the outside. Do you mean outside as in outdoors? It just can't be on the outdoor side unless it's raining.

Anyway......you need more air movement and less humidity. What is the humidity level of your house, where is the house, what has the high and low temps been lately?

Jaz

The house is in New Jersey and the temperatures have been low. At night it has been in teens and we have had about 40 inches of snow since December. We turned the humidifier down to medium low today. It is a new heating system and new humidifier. Do you think an oscillating fan on the window sill might help?

Please be specific, is the condensation on the outside surface, between the panes or on the inside surface where you can touch it?

Michael,

You need to tell us where the wet is. Turning down the humidifier to medium may be a good move (?), but we still don't know what the % of humidity is, medium means nothing. New heating systems can take some getting used to, I suggest you buy a portable digital thermometer/humidistat to measure levels in your home. If the dampness is on the inside as we suspect, a fan will take care of it, but will not cure what caused it.

Jaz

The condensation is only on the inside.

OK. On the inside, thought so. Monitor the humidity levels relative to the outside temps and make adjustments. You want as much humidity without causing excessive moisture on your windows. If the air is too dry, you will feel colder, your nose/mouth will be dry, skin will crack, furniture will stick etc. You may need to make daily adjustments to the humidistat as temps change. Generally you'd like 35% when it's real cold, (lows below 20-25) and about 45% when it's 30-40 or so.

Jaz

The dial on your humidifier is not a very exact tool, you still have too much relative humidity. This means relative to the outside temps, when it gets colder you must lower the inside humidity. Buy a cheap sling hygrometer to get an accurate reading but you are still way too high

Thank You everyone. I lowered the humidity level on my humidifier and it has made a big difference.