08:11PM | 12/10/13
We live in Denver and have an evaporative cooler on our roof. We have winterized it by draining the basin and covering the unit. I cut thick insulation to push up into the shaft above the register. We also have a humidifier on our gas heater. During this recent cold (10 degrees F) spell we have had condensation in the shaft which leads to water leaking from the register onto our floor. I realize I need to do a better job of sealing off the cavity so warm air doesn't get into the shaft - do you have any tips on how best to temporarily seal so that I won't have a mess undoing my work in the spring?


01:23PM | 01/05/14
I also live in Denver and am experiencing the same problem. I have tried stuffing old pillow up into the shaft to prevent warm moist air from rising.


05:15PM | 11/30/15
I live in SLC, UT and have same problem even with the insulation pillow in the shaft. Any extra advice would be awesome! Thanks


09:24AM | 03/04/16
I live in Utah as well and have this problem in the winter. It seems that water is coming down the outside of the duct because the drywall around the ceiling vent is occasionally getting wet.

I'm wondering if wrapping the outside of the duct in unfaced fiberglass would help; I have two insulating pillows up in the vent to block airflow and heat from escaping, but it still seems to be a problem. If anyone else has any ideas or fixes, please post them.
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