Pricing varies depending on type and size of HVAC system in the house. The average Calgary house spends around  the $400 mark. Typically our Furnace and Duct Cleaning package starts at $179 and it includes 10 air vents. All air vents must be cleaned in order to guarantee a completely clean duct system. Some homes have more than 10 air vents. Any additional air vent is charged at $9.95.  Other components such as dryer vents, chimneys, or central vacuums are usually added and are priced separately. All pricing excludes tax and other applicable fees.