Condensation on windows

[Terence McCann]

There is a house that was built in our neighborhood about two years ago. It sat vacant until six months ago.

Every morning, when my wife and I go for our walk, I notice that the windows on the home have condensation on them. Doesn't matter what the outdoor temperature is, it happens when it's 70 out or 45 out. They very rarely run the a/c, the windows are almost always open. This happens on the windows that are open as well as the big front picture window.

The house is about 3,000 sf + for what it's worth.

Any ideas?

[Scottpat]

Do you think they might be cultivating some plants[] in the house?

[Terence McCann]

You mean like Hydroponoic Tomatoes perhaps? [:-eyebrow

[bradfeldt]

Is it condensation on the glass or is it between the panes of glass? It sounds more like a failed seal.

[Terence McCann]

On the glass. The house is only 2 years old.

[bradfeldt]

Could it be a back drafting water heater that is spilling excessive moisture into the home after the family's morning showers? Coupled with not running exhaust fans you could have a signifcant amount of moisture that would dissipitate during the day time when the water heater is not running.

[Bruce Thomas]

Terry,

A couple of thoughts. The back drafting water heater is a good one. How about poor or lack of attic ventilation. I've seen water dripping from light switches and the cause was that some one stuffed the vents with insulation. Another slim possibility is that the excess moisture from keeping the house closed has not dried out yet but that "should" be gone after 6 months.

Bruce