Air Handlers, Evaporator Coils and Blowers

Sometimes, if the system is young and the outdoor unit is healthy. A coil must match the outdoor unit's capacity and refrigerant, and pairing a new coil with an old condenser wastes the coil. On a system past ten years, the honest answer is often to price the whole replacement. See the repair-or-replace guide.

That pipe is the secondary drain from the attic pan. Water there means the primary drain is clogged and the backup is catching the overflow. Turn the system off and call. Left alone, the secondary pan fills and the ceiling below is next.

It uses less electricity than a PSC motor for the same airflow, and it runs long low-speed cycles that help humidity control. The savings shrink when the ducts are restrictive, because the motor works harder to hit its target. Fix the return first, then enjoy the motor.

Inspected every year, cleaned when it is dirty. A well-sealed filter that is changed on time keeps most coils clean for years. A coil that needs cleaning every season is telling you dust is getting around the filter, and that is the thing to fix.

Usually a return leak in the attic pulling in insulation dust and haboob grit, or a filter rack with gaps around the edges. Occasionally it is a new home shedding construction dust. A technician can find the leak with a static pressure test in an hour.

It is normal for Phoenix and it works, but it works harder. The cabinet lives in 155-degree air, so sealed seams, insulated ducts and a sound drain pan matter more than they would in a closet. It is not a reason to move it. It is a reason to maintain it.

No. On a PSC blower that is often a failed capacitor, and on an ECM blower it can be the control module. Both involve the electrical compartment, which is not a homeowner job. Switch the system off at the thermostat and call. Do not open the panel.