What can be affected by dirty condenser coils?

Dirty condenser coils can significantly impact the efficiency of an air conditioning system. When the coils are covered with dirt, dust, and grime, they cannot effectively transfer heat. This reduces the system's ability to cool the air, causing it to work harder and consume more energy to achieve the desired temperature. As a result, not only does the A/C system become less efficient, but it can also lead to increased wear and tear on components, potentially shortening the lifespan of the unit.

While the other options may involve components of the A/C system, they are not directly affected by the condition of the condenser coils. For instance, although an air filter's lifespan may be influenced by the overall cleanliness of the system, it is not directly linked to the condition of the condenser coils. Thermostat function and heating elements are also distinct from the operation of the condenser coils. Therefore, the most direct and evident impact of dirty condenser coils is on the efficiency of the air conditioning system itself.