Performed furnace diagnostic 2016 carrier heater. Upon my maintenance all components within the system checked out properly although found concerns regarding indoor air quality and filtration. Due to 1 inch filters only filtering out about 10 to 15% of the dust particles this has resulted in dust and debris buildup within the air mixing cabinet of the system. If filtration is upgraded This will not only increase the longevity of your system but the air quality within your home. Recommended that a 5 inch thick filter is installed on the HVAC system that has a one-year lifespan and 95% filtration efficiency. Additional upgrade To increase filtration to it’s maximum potential is adding in a whole house purification device that ionizes the air and sanitize all surfaces within the home While the system is operational in heating, cooling, fan Circulation mode. Upon departure system is fully operational and heating home