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This is before and after of evaporator coil on a gas package unit that had a not heat call. Upon inspection I found the unit off on high limit. With knowing what could cause a high limit situation and ruling all possibilities out with the electronics I discovered a filthy coil. Having enough airflow is key when running our heating equipment, especially if your system has a more advanced motor such as ECM or Variable Speed. Heat requires airflow to be set at a slower speed and thus airflow issues can become more apparent during the heating cycle rather than cooling. Therefore, it is key to have your filters cleaned or replaced to provide sufficient airflow for your system to operate properly. Ductwork should also be addressed at the same time to make sure you have adequate air coming to and from your system. #aplusheatingandair #hvac#hvactechnician#hvaclife#hvacservice#hvacproblems#hvacquality#hvacrepair#hvaccontractor#hvactech#hvacwork#hvacpro#dirtycoil#dirtycoils vs #cleancoil#cleancoils#airflow#filterreplacement