If you suspect that your heating and cooling system is experiencing airflow problems, there are several reasons that could explain them. The first is related to the outdoor condensing unit. These units can become obstructed by leaves and debris blown. Owners need to be conscientious about regularly cleaning these units. Even HVAC systems located in mechanical rooms can become obstructed by equipment or other storage items. A second cause is blocked vents and registers. This problem is common in office settings, especially when employees can’t agree on the temperature settings. This problem is easy enough to fix – clear the vents and registers. The third reason that an airflow is compromised is that air filter hasn’t regularly been changed. That filter has an important job removing dust and debris from the air, keeping it out of your HVAC system and air ducts. Always change filters according the manufacturer’s instructions. The fourth possibility of blocked airflow involves the air ducts themselves. Dust that gets past the air filter ends up clogging the ductwork, leading to a smaller passageway for the air to flow. And it’s not unheard of for rodents to build nests in the air ducts. Have your ductwork inspected to see if a good cleaning could solve the problem. What about the thermostat? It should also be investigated to verify that the thermostat is functioning as it should and/or if its battery needs to be changed. Finally, take a good look at the design of the HVAC system itself. When buildings are renovated, the heating and cooling system is sometimes overlooked. If that’s the case, the layout or sizing of the ductwork may no longer be able to properly handle the air flow.