Expelling Moisture From Your Home - December 14th 2004


Expelling Moisture From Your Home

The most often talked about problem in homes is moisture and how to get rid of it.

Moisture usually becomes a problem as soon as the weather starts to turn cold and we close up all the doors and windows. When all the windows and doors are shut, the moisture within your home begins to look for other places to vent, i.e. HRV (heat recovery ventilation) or exhaust, fan, range hood or fireplace.

If you do not have or use any of these ways of venting excess moisture, you may find the excess showing up as condensation on windows or as stains on the ceiling. Walls inside closets, bathroom tiles, and basement storage areas will start to show signs of dampness and staining. Moisture causes odors to linger in crawl spaces and basement rooms allowing fungus and mildew to grow. This is particularly discomforting to many people with allergies.

Here are some possible solutions:

1. Any home with or without a window in the bathroom should have an exhaust fan, controlled by a dehumidistat moving air at an average rate of 105 cubic feet per minute

2. Forced air furnace:
If your forced air furnace has only a single speed blower motor, have a conversion made to a 2 speed motor, allowing air to be circulated 24 hours a day, 365 days a year throughout your home.

Two speed motors operate your blower at 1/3 the RPM when the burner is off, still pressurizing the home by blowing the unwanted moist warm air out open windows or vents. If after installing a 2-speed motor, you start to feel drafts at some of your floor registers, you should consider installing a HOYME DAMPER. This is installed on the inflow cold air duct and the combustion air duct on your furnace and prevents the cold air from coming into the home through the heating system when the burner is off.

For more information about the Hoyme Damper, visit their website at www.hoyme.com.

Electric or Hot Water Heated Homes, Radiant or Convection

With these types of heating systems it is very important to have the best exhaust ventilation system you can afford as you do not have a forced air flow within the home moving the air. You should install a Heat Recovery Ventilation System (HRV) to control moisture and air quality as well as recover up to 70% of the heat within the moist and stale air being exhausted from your home.


NOTE: during summer air conditioning, your cool air is being returned as well.

Bathroom fans that have a manual on off switch should be left on for a minimum of 1 hour after bath or shower use. This can be accomplished by installing a one-hour timer- simply remove the single pole on/off switch and replace with a timer. This allows you to go about your day and have the fan automatically shut itself off.

For information on Heat Recovery Ventilators, visit the LifeBreath website.