Why The Biggest "Myths" About Duct And Dryer Vent May Actually Be Right

http://louiszowl093.aircus.com/10-sites-to-help-you-become-an-expert-in-air-duct-cleaning-frisco-tx

Regular air duct cleansing can take away this concern nearly totally. Energy efficiency is often dependant on the temperature setting of the thermostat. Frequently a heating unit will last from 15 to 20 many years.