I know this is a timeless topic that never seems to die, but it's that
time of year where my windows drive me insane again.
The house was built in 1997 with Pella Architect casement windows and
extra insulation in the attic, and I'd also place money on the furnace
being undersized. To add insult to injury, when the contracters
installed the ductwork, they made the mistake of routing one floor
register vent into the cold air intake box.
This is the third year I've lived in this house, and fighing window
condensation seems to be a yearly obsession of mine. If wouldn't give a
rats patute about the condensation if it weren't for the fact that if
starts to run, and freezes on the seals and on the wood itself.
Right now, my humidity is high (50%), but I have the same problem with
condensation at %20-25. It starts with the two bedrooms and master bath
upstairs, but eventually, it makes its way to all of them. Now, those
two rooms and that bath have their doors closed all of the time due to
pets. I'm sure that's not helping air flow either.
Here's what's happened so far:
The end of last season, I have a local HVAC guy stop buy. His take:
negative pressure. He also pointed out that the AC fan was wired to
HIGH, and the Heat fan was wired to LOW. I promply set the heat fan to
MEDIUM, and that appeared to make a difference during the last month of
winter (Ohio winter). But, since we didn't have many bad days by then,
maybe that was a fluke.
As usual, I've cleaned all of the frames to get out the webs, nests,
dirt, grass, etc. I've clean all the weap holes, and I've put a new coat
of UV rates poly on the wood frame between the outer pane and the inner
removable doublepane so they're not sucking mosture. The poly they used
when the house was new was clearly not UV rated since it was peeling
like crazy. But I digress...
Here it is, October 17, at ~40 outside, and the fun has already started
with condensation for the first time this morning. The house usually
sits around ~65F and I haven't turned the gas furnace on yet.
We just ordered glass doors for our wood burning fireplace insert with
the plans of burning much more wood this season due to the skyrocketing
gas prices. The insert has an outside air source vent, and a blower to
blow the box air back into the house. With any luck, the glass doors
will do their job and keep the heat I have in the house. :-)
I also turned the furnace fan on this morning just to help with
circulation. Who knows if it will make any difference.
While cleaning the windows, I've taken notice of the fact that the
rubber seals they put on those things suck serious butt. In some cases,
the seal is so flat, it can't be sealing against the wood frame well, if
at all. Combine that with negative pressure, and you have a real good time.
I'm toying with the idea of getting some thin weatherstripping, and
trying on of the problem windows to see if that helps.
They are plenty of directions to go from here, but I can't seem to find
anyone local who really knows their stuff. Any thoughts?