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Humidity and your ac cooling

PostPosted: Tue Jul 05, 2011 8:57 am
by Service
An air conditioner’s ability to manage proper humidity levels indoors has a lot to do with how well it’s matched to the size of your house or room. An air conditioner that’s too small likely won’t get the humidity or the temperature down to a comfortable level. That doesn’t necessarily mean that bigger is better.
In fact, an air conditioner that’s too large for the space you’re using it to manage will have a difficult time bringing down the humidity level. Sure, you’ll wind up with a cold room, but that room will remain damp, making it no more comfortable than it was before the air conditioner was turned on.

Control Humidity at the Source
Whole House High Humidity
Lack of ventilation – newer homes are “tight,” meaning well-sealed, restricting ventilation. Without fresh air circulation, humidity builds up inside your home (only an issue during heating season when the windows are closed).
Oversized central air conditioner – central air conditioning is an excellent dehumidifier. An oversized central air conditioner, however, has on-cycles that are too short to effectively remove humidity. Also, the cold air may actually increase the relative humidity, making your home colder and clammy.
Caution – a gas-fired appliance not venting properly can cause high humidity. If you have any doubt, immediately contact a good heating contractor to check it out.
Localized High Humidity
Overcooling – if an area gets too much cold air supply, you may create condensation and a high humidity problem. Adjusting the supply registers may help.
Clothes dryer discharging into house – this situation creates a huge source of moisture concentrated in a small area. Clothes dryers should discharge to the outside. Verify that the discharge pipe is clear and connected properly at the back of the dryer.
Bathroom fans – showers and baths add a great deal of moisture. Install an exhaust fan.