Below is a great link to an EnergyStar website where it will tell you where air leaks generally come from and how to correct the problems. The website has guidelines, images, and tools that will help you or your clients in identifying possible air leaks. There is also great information on adding insulation and sealing duct work. All of this could be helpful especially this time of the year. Thanks.
www.energystar.gov/index.cfm?c=home_sealing.hm_improvement_sealing
(main website: www.energystar.gov)
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