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Thursday, October 17, 2013
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Understanding Window Condensation

The moisture that suddenly appears in cold weather on the interior or exterior of window and patio door glass can block the view, drip on the floor, or freeze on the glass. It can be an annoying problem.
 
While it may seem natural to blame the windows or doors, interior condensation is really an indication of excess humidity in the home. Exterior condensation, on the other hand, is a form of dew – the glass simply provides a surface on which the moisture can condense. What are some ways to control window condensation?
 
 
 
 
Reduce the indoor relative humidity in living areas, attics, and crawl spaces. The following are a few general suggestions:
 
■ Reduce the amount of moisture you put into the air. This can be accomplished by recognizing the many sources of moisture in the air—from cooking to heating to plants and other items.
 
■ Vent all gas appliances, the clothes dryer, and exhaust fans to the outside. In most climates you should also ventilate your attic and crawl space to the outside. If you have a crawl space it is very important to completely cover the earth with an effective vapor barrier. If you run a humidifier you may need to turn it down or off.
 
■ Drapes and other window coverings can contribute to a condensation problem by restricting the flow of warm room air over the glass surface. Therefore, indoor condensation is more apt to occur when the drapes are closed or the shades are pulled down.
 
Make sure you run the exhaust fans in the kitchen when cooking and in the bathroom when bathing or showering. Run the exhaust fan until the mirror in the bathroom is clear or the temperature near your stove is back to normal. Be careful not to run the exhaust fan too long and overheat the motor.
 
■ Avoid storing firewood in your house or basement.
 
■ For products with the interior insect screen, removing the screen in the winter months when the window is not typically being operated may reduce condensation behind the screen by increasing air flow.
 
If you have a forced air furnace, make sure your home is properly ventilated by installing a fresh air intake. Or if your home is extremely “tight” and you have excessive moisture, it may be helpful to install an air-to-air heat exchanger.
 
For more information on the causes of and cures for window condensation, call your Renewal by Andersen showroom and ask for our free booklet, “A Guide to Understanding Condensation” or contact the following resources;
 
National Fenestration Ratings
Council (NFRC)
1300 Spring Street, Suite 500
Silver Spring, MD 20910
(301) 589-6372
 
Energy and Environmental Building
Association (EEBA)
10740 Lyndale Ave S., Suite 10w
Bloomington, MN 55420-5615
(952) 881-1098 www.eeba.

 
 
 

'Restrictions and conditions apply; see your local representative for details. Cannot be combined with prior purchases, other offers, or coupons. No adjustments to previous orders. Offer not available in all areas, discount applied by retailer representative at time of contract execution and applies to minimum purchase of 5 or more windows.  Offer does not include bay/bow  windows.  As part of the Instant Product Rewards Plan, all homeowners must be present and must purchase during the initial visit to qualify  To qualify for discount offer, initial contact for a free Window  Diagnosis must be made and documented on or before 10/31/13, with the appointment then occurring no more than 10 days after the initial contact  0% APR for 60 months available  to well qualified buyers on approved credit only Not all customers may qualify  Higher rates apply for customer with  lower credit ratings  Financing not valid with other offers or prior purchases  No Finance Charges will be assessed if promo balance is paid in full in 60 months. Renewal by Andersen retailers are independently owned and operated retailers, and are neither brokers nor lenders. Any finance terms advertised are estimates only and all financing is provided by third-party lenders unaffiliated with Renewal by Andersen retailers, under terms and conditions arranged directly between the customer and such lender, all subject to credit requirements  Renewal by Andersen retailers do not assist with, counsel or negotiate financing, other than providing customers an introduction to lenders interested  in financing  NJ Consumer Affairs License#   13HV01541700. NYC Consumer Affairs License#1244514. Nassau Consumer Affairs License#  H081 015000. Suffolk Consumer Affairs License#  43991-H. NYC 1307704. Renewal by Andersen of Central/Northern NJ and Long Island are independently owned and operated affiliates operating in the NJ/NY metropolitan area.*A  PG25 pressure differential applied to the windows (48"x 48" size) in the lab on structural test only Most Renewal by Andersen double-hung, picture and casement windows  meet this structural performance  Temperature performance tested in differential  chamber. "Renewal by Andersen" and all other marks where denoted are marks of Andersen Corporation  ©2013 Andersen Corporation All rights reserved.  *See limited warranty for details. 1Values are based on comparison of Renewal by Andersen® double-hung insert window  SHGC to the SHGC for clear dual pane glass non-metal  frame default values from the 2006 and 2009 International Energy Conservation Code.

 
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