Performed air duct cleaning and sanitation on 4 bedroom 2 system house. All vents and ductwork are clear of dust and debris at this time. Both systems are functioning properly at this time. Recommend duct cleaning every 3-4 years. Unable to perform dryer vent cleaning at this time due to rain with scattered thunder and it being 2nd floor vent. Cannot perform the cleaning from the inside because of a birds nest. Will need to return at a later date. Thank you for your business!