The best way to know if your cleaning was effective is through improved performance of your HVAC system, ideally. You can have before-and-after pictures taken of the ducts (make sure they are of the intake ducts - the ducts that return air into your room), motor and coils. Another tip is smell – sniff the ducts before and after the work is done. Outside of noticeably improved performance, smell and visual evidence are your best indicators.
If you’re spending extra time to dry clothes completely due to a clogged dryer vent, you can bet you’re also spending extra on utilities. Extended or extra drying cycles also mean your clothes will be subjected to more wear and weathering. By hiring a Dryer Vent Wizard and shortening your drying time, you’ll use less power and save your clothing from excessive damage.