Once a year at minimum, and ideally as part of the same visit that services the rest of your cooling system. The air handler is the component homeowners think about least and the one that quietly determines whether everything else works.

What the Air Handler Actually Does

The outdoor unit gets the attention, but the air handler is where conditioned air is produced and pushed into your home. It contains the blower motor, the evaporator coil, the filter rack, and on many systems the electric heat strips.

Every cubic foot of air you breathe indoors passes through it. That makes it both a performance component and an air quality component, which is why neglecting it produces such a wide range of symptoms.

What Annual Service Covers

  • Blower wheel cleaning. Dust accumulates on the blades and progressively reduces airflow. A heavily loaded wheel can cut output substantially while looking fine at a glance.
  • Evaporator coil. Cleaned and inspected. A dirty coil cannot transfer heat and cannot dehumidify properly.
  • Condensate pan and drain. Cleared and treated. This is the single most common cause of water damage from an air handler.
  • Electrical. Capacitor testing, contactor inspection, wiring and connection checks.
  • Motor and bearings. Amp draw measured against spec — a motor pulling high amps is failing before it sounds like it.
  • Filter rack fit. Gaps let air bypass the filter entirely.

Why the Condensate Drain Matters So Much Here

In a humid climate, an air conditioner removes gallons of water per day. That water collects in the drain pan and leaves through a small line.

Biological growth builds up in that line and blocks it. When it does, the pan overflows — and because air handlers are frequently installed in attics or on platforms above finished ceilings, the result is water through drywall.

Systems with a float switch shut down instead of overflowing, which is better but presents as “my AC quit for no reason” in the middle of August. Either way, a five-minute clearing during annual service prevents it.

Signs Yours Needs Attention Now

Weak airflow at the registers, particularly if it has declined gradually. Water stains near the unit or on the ceiling below it. A musty smell when the system starts. Unusual noise from the blower. Ice on the refrigerant lines. Or short cycling, which restricted airflow across a dirty coil will cause.

Ice is the one to act on immediately. Running a system with a frozen coil risks flooding the compressor with liquid refrigerant, which turns a cleaning into a replacement.

Filter Changes Are Separate

Annual professional service does not replace filter changes. Those are on a much shorter cycle — typically every one to three months depending on the filter type, whether you have pets, and how much the system runs.

During a Hill Country summer, when the system runs most of the day, filters load up faster than the package says. Checking monthly and changing when dirty beats following the calendar. Options and ratings are on our air filters page.

The Ductwork Connection

An air handler can only perform as well as the duct system attached to it. If return ducts are undersized or leaking, the blower is fighting static pressure it was never designed for, which shortens motor life and reduces output.

We measure static pressure during service. High readings point to ductwork problems rather than equipment problems, and no amount of air handler cleaning fixes an undersized return. Duct sealing is often the higher-value repair.

Scheduling It Efficiently

The practical approach is to service the air handler as part of spring AC maintenance, since the technician is already at the equipment. On systems with electric heat strips, the fall visit checks those as well.

Our Care Club maintenance plan covers both visits and keeps them on schedule, which is the main reason people join — remembering is harder than paying.

We service air handlers throughout Fredericksburg, Kerrville, Boerne, Comfort, and the surrounding Hill Country. Contact 72 Degrees or call (830) 468-5316.