What might be a sign that an HVAC unit needs maintenance?

Strange odors can be a significant indicator that an HVAC unit requires maintenance. Unusual smells emanating from the system can suggest various issues, such as mold or mildew growth within the air ducts or the unit itself, which can affect indoor air quality. It may also indicate overheating electrical components or burning materials, signaling a potential fire hazard. Prompt attention to strange smells can help address safety concerns and improve the overall performance and efficiency of the HVAC system.

In contrast, consistent temperature control, quiet operation, and low electric bills typically suggest that the HVAC unit is functioning well. These characteristics are generally associated with a well-maintained and efficiently operating system, whereas the presence of strange odors directly points to underlying problems that need to be addressed.