Refresh your Memory Osmosis
What can be done in my home? Wipe off the condensation. By doing this, you are physically reducing roomside humidity. Open the windows an inch or so. The dry outside air will mix with humid inside air and reduce roomside air diffuser. Lower your humidifier settings to % or below. Open up your blinds and drapes to a level which will allow the roomside heat to warm the glass surfaces. Use exhaust fans during and after showering and cooking. If you are painting or drywall taping open the windows to allow moisture to dissipate. Look at your clothes dryer. Make sure it vents to the exterior. “Vent-less” clothing dryers can bring large amounts of moisture into living spaces. It could be the windows too. After excluding non-window fan coil unit, look for these possibilities on the windows themselves: Weather-stripping not tightly compressed allowing air infiltration into the space. Although we know that air infiltration can actually reduce interior humidity, it can also focus a cold spot on a metal window or glass edge.If there is a cold spot you could see condensation or even frost which could be window related. There could be a similar cold spot where caulk is missing at the perimeter of the fan coils. Your windows could be single-glazed, where only one layer of glass, rather than two, separates you from the exterior. Deal with humidity first Good strategy would be to deal with the living space issues first. If you attack them as we describe above, condensation can disappear in - hours.