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Proper Humidity Levels

Having proper humidity levels in your home or business is important not only for your health but also in the amount of energy your HVAC systems use to keep you comfortable. If the humidity level in your home is high in the summer you will not feel cool. If the humidity level is low in the winter you will not feel warm when the thermostat is set at an average temperature. This will result in turning the HVAC thermostat up to compensate and you will use more energy to stay warm. A properly designed and installed system will keep the proper levels of humidity in your home or business and save you money on energy used by the HVAC System. For more information on humidity and the benefits of maintaining proper levels visit High Performance HVAC's Humidifier Page.

Before You Call

Before calling a heating and air conditioning company, check the following:

Check selections on thermostat. Ensure that it is set to the desired settings.
Check power supply. This can include a circuit breaker and or/a regular looking wall switch close to the indoor unit
Check for freezing up of units. If the unit is frozen turn it off. Check the filter(s) and supply vents to make sure they are not obstructed in any way. If you find no problems leave the unit turned off and call a service company.

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Home Humidity Problems Maintaining Proper Home Humidity

Written by Richard

High Performance HVAC Air Conditioning & Heating: Home Humidity Problems

Is 60% Humidity in the Home Too High?

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 in to 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 humiity problem? If yes, what could be causing the humidity problem? The installer said it is not the furnace.

Answer........

Maintaining the proper humidity levels in the home is important not only for health (as indicated on High Performance HVAC Humidifiers Page) but also for the wood products in the home including 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 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.

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 gotten rid of down a condensation drain near the furnace or blown out the exhaust where the combustion gases 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 as 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, Lennox G61MP Condensing Furnace, Too Much Humidity Around Windows