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We are having an issue with the windows sweating like crazy.  They are Andersen with wood frames so we have to wipe the lower edge of both the top and bottom panes cause they drip like crazy and it is going to ruin the wood - already has in some spots - turning it black.

This is a weekend house in Maine for now - retiring there in a year or so.  It was pretty damn cold there last week - lowest was -7 degrees.  When we leave we set the temp to 55 degrees - we have a Nest thermostat that we can adjust the temp before we leave home (3 hours away) so it is about 65 by the time we get there.  I hate to have to run the dehumidifier all day and night.  We cannot close the shades at night or it will be 10 times worse in the AM.  Any thoughts? 

I was going to see if I could get in touch with Andersen to see if there is something wrong with these.  There sometimes is ice along the lower edge - then it melys and drips.  At the runner on the sliding door to the deck there is a LOT of ice - I assume because the runner is metal but this does not seem normal to me.


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I forgot to say the house is only 5 years old - Katahdin Cedar Log home

I live in Maine too.  I had anderson windows in my last place and I liked them.  This one I have Jeldwen and Marvin patio / slider.  Its been real cold -14 to -16 plus wind chill into -35 range a few days last week.  If you have a tight house and get some humidity build up in your house it can happen.  Especially in bathroom and kitchen, when washing dishes etc.  Also even insulated glass will get cold when you turn the thermostat down on very cold nights, and when you heat back up you can get some moisture build up along the bottom edge especially.  Remember if you turn your thermostat down to 50 or 55...your glass will be that temp or maybe a bit when you heat back up, there is going to be a temp. differential between the glass and heated air which will condense on the glass. I heat with pellet stove and wood I always have continuous steady heat and don't run into that problem too often.  Usually it will go away as the glass heats up.  I also have one window that is older and has a bad seal on the bottom so I get some frost build up along the bottom edge.

If it is inside between the panes of glass, you have a seal problem from the factory.

If it is really extreme, I guess you could have air leakage around the glass to the wood frame allowing cold air to enter around the window pane (many years ago some Anderson windows had this problem)?

Last week I was cooking in the kitchen and I opened the door and it was like sea smoke (fog), where the moist heated inside air was hitting the extreme cold outside air and forming tiny ice particles like fog.

We have also had some very extreme temp swings......sub zero to 45 degrees yesterday.

You could also contact your builder and see what he thinks as well?

We (Maine) is going to warm a bit, so it should not be a problem right now.

Judy and Lee.  I understand you have a Katahdin log home with white cedar wall logs?  I love the Katahdin homes!  I am looking at building a log home and can't decide to go with a pressure treated white pine or white cedar.   I love white cedar but it is a bit more expensive than white pine.  Did you borate treat your white cedar?  what can you tell me about your logs, if you don't mind.  Thank you!

This sounds like an indoor humidity issue.  Maybe generated near this particular window?  The indoor humidity should be around 40%, or less this time of year.  I'd get an inexpensive humidistat and place it near the window and see what the reading is.  If under 45%, then its another issue.  If over, you might need an exhaust fan, or dehumidifier that kicks on above a certain level.  But its always best to treat the source.  

Is the window trim to log connection and patio door to log well caulked, chinked or sealed on exterior?  Any uphill checks on exterior near these places that are exposed to weather and need caulked?  The cedar logs should be well dried and settled by now.  

It is not a particular window it is EVERY window.

What type of heating system?

Burning propane produces a significant amount of water.  The equation taught in Organic Chemistry 101 is:

C 2 H 6 + 5O 2 --> 2CO 2 + 3H 2 O

For every gallon of LP that you burn, you produce about 1 liter of water.  Without adequate ventilation, the water remains trapped and appears on windows as moisture or is the incubator for black mold and other spores around the house.

My recommendation is a dehumidifier.

Thomas Elliott

We have Propane and have baseboards

I would get an Anderson Rep out. They usually prefer to get to the bottom of the problem, than to have a bad rap. 

would you have any idea who and where I would/should contact?  I would rather tell the story once to the correct person/department.  Any contacts??

If you know the lumber company of which the windows were purchased from, contact them. They can provide you with the name and contact information of the local service representative for your area.

My guess is an improper seal or flashing around the perimeter of the window, allowing warm and cold air to mix, right around the window area.

I would be hesitant to blame Anderson . With baseboard heat you have no circulation and the air around the windows will cool and slide down the glass not mix. Eventually reaching the dew point and condensing.

Try the dehumidifier.


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