The most obvious reason is to save energy and as a result save on your utility bills. Most homes today are very leaky do to building penetrations by electric, plumbing and HVAC installations. The average home is loosing 15% of its energy through HVAC duct loss alone. A home can't be too tight and most are very leaky.
Another reason that is less obvious but is really more important is indoor air quality. The combination of leaky ducts, unsealed building utility penetrations and the fact that the ventilation systems are usually in your attic and/or your crawl-space means that your home is a breeding ground for mold. Many ventilation systems create an environment that, do to condensation, help mold grow inside your home. Moldy, leaky ventilation systems cause respiratory health problems.
A tight, properly ventilated home will save on utility bills, add thermal comfort, provide clean fresh air and add value to your life.
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