King's Carpet & Air Duct Cleaning provides air duct and dryer vent cleaning services for Northern Colorado and Cheyenne. The document recommends getting air ducts cleaned every 3 to 7 years to remove dust and debris. It also recommends regular dryer vent cleaning, which can help prevent fires and improve dryer performance. Different air purifying systems like UV lights and HEPA filters are also described that can help remove particles, bacteria, viruses, and odors from the home's air circulation.