Do I replace the coils or the entire unit? This is a question faced by unit owners and contractors all too often. When a system has been operating correctly and only the coils have failed, when is it justifiable to repair the system versus replacing the entire system? The answer depends on the situation.

There are cases in which the best option for the customer includes changing a system’s direct expansion (DX) coils. This article includes guidelines to do the job efficiently and correctly, but remember: It’s not a substitute for other established procedures.