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shaela21

09:52AM | 11/27/04
Member Since: 11/26/04
2 lifetime posts
Bvmisc
Hello. I have a 1100 square foot home in Victoria, BC. On clear nights, I always wake up to condensation on the windows, and I know what causes it. My question is whether or not to get a dehumidifier. I am looking at about $250.00 Cdn for one. I do not have mold problems, and a cheap humidistat is reading about 75% humidity. I run a bathroom fan 24/7 and it never lowers below the 75%. The air in the house can smell a bit damp, but not too bad. The house also takes a while to heat up. I use electric baseboard heaters.

Question is, should I buy the dehumidifier, or wait out the winter and not be too concerned with this. It is not a critical issue, just a situation that I would like some advice on. Thanks.

theeagle

07:14PM | 11/28/04
Member Since: 11/27/04
174 lifetime posts
question is .where is the make up air coming from that is being taken away by the exaust fan.

75% is quite high. a dehumidifier will not operate below 22c degrees efectively.

the bathroom fan, how much air is it exausting per minute?? at least 100 cfm for good lowering of humidity.(not the cheapys at 60 cfm) 120 cfm would be better. and where is your fan exausting too? or is the exaust pluged up. will the fan ,when on, hold a piece of tissue to it and it won't fall easily?

and basement? is it a crawl or a basement. does it have a vapor barrier of 6 mil poly on the soil? is it sealed around the edges?

many variables to check out.


shaela21

04:10AM | 11/29/04
Member Since: 11/26/04
2 lifetime posts
Our bathroom fan is 100 CFM, and it works fine. I have gone up on the roof and ensured there was no blockage, and I have a good airflow. No basement to be concerned about as I am in a rancher.

But I did go get a quality humidistat, and apparently I am lower then the other humidistat is reading. I am about 55% rather then 80%. So that is good. Thanks for your reply.

david_wv

10:38AM | 12/13/04
Member Since: 01/28/01
171 lifetime posts
I think you're getting condensation due to heat loss rather than high humidity. You said you get condensation on clear nights. That's when the house is radiating heat through the windows into outer space. Weird huh? The condensation is not good for the windows and frames. I used to get some nasty mold on one window sill before I cut the heat loss. I would suggest a window film that blocks the heat loss until spring. Curtains would keep new moist air from getting to the window - limiting the moisture supply. You may need better windows.
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