Home Humidity Problems - HIGH HUMIDITY 60 % +. Within the last month, I moved into a new house. It has dry walls and not plaster walls. The furnace and hot water tank were installed a week or so before we moved into the house. Last week we determined that there is a humidity issue when the windows were sweating. We are trying to determine the source of the humidity. The contractor feels it may be the high-efficiency furnace. I have a Lennox g61mp. The combustion air is pulled from within the un-finished basement. Should the air be pulled from the outside? The gases are vented via PVC pipe which slopes back to the furnace.

Could the furnace be causing the humidity problem? If no, what else could be causing the humidity problem? The installer said it is not the furnace.

Home Humidity Problems – Is 60% Humidity in the Home Too High?

Maintaining the proper humidity levels in the home is important not only for health but also for the wood products in the home. This includes doors and windows. The quick answer to your question about the furnace causing the humidity problems is no. Gas furnaces and other heating appliances tend to dehumidify (in a manner of speaking) the air and do not create any more humidification. I wonder where your supply vents are located and are they directed to blow hot air towards the windows?

Condensation is created when the temperature of air is colder than the dew point. A prime place for this to occur is windows and doors. This is part of the reason why many supply vents for forced air systems, and radiators for hot water systems, are placed near windows and doors. It keeps the windows warmer and above the dew point and also makes the air warm from your heat loss near these locations.

Home Humidity Problems – Lennox G61MP Gas Furnace

The furnace you describe, the Lennox G61MP, is a condensing furnace and having the combustion air intake in the basement actually, contributes to removing humidity from the basement. It sucks the air from the basement for use in the combustion process and the humidity in this air is condensed during the combustion process in the heat exchanger. This condensation is removed through a condensation drain near the furnace or blown out the exhaust where the combustion gasses are expelled. If your supply vents are located near the doors and windows and you still have this problem then it may be time for new doors and windows. You have too much heat loss at these places and all the humidity is being condensed around the windows in your home.

Home Humidity Problems - Proper Humidity Levels

For more information on humidity and health click here.

High Performance HVAC

Home Humidity Problems Maintaining Proper Home Humidity

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