What Is Included in a Professional AC Tune-Up?

Refrigerant Charge Verification

Checking refrigerant levels is one of the most important steps in a tune-up. Technicians measure subcooling and superheat values, not just line pressure, to determine whether the charge is correct for current conditions. A system that is even slightly low on refrigerant loses cooling capacity and efficiency disproportionately in humid climates.

If levels are low, the technician will look for the source of the leak before simply adding refrigerant. Recharging a system with an active leak is a temporary fix that will fail again.

Electrical Component Testing

Every electrical connection in the system is inspected, tightened, and tested. Capacitors are tested with a meter to measure their actual capacitance against the manufacturer's specification. A capacitor that has lost 10% of its rated value is on its way to failure and is far cheaper to replace during a tune-up than during an emergency call.

Contactor points are inspected for pitting and wear. Motor amp draws are measured and compared to nameplate ratings. High amp draws indicate a motor that is working harder than it should, often due to dirty coils, bearing wear, or electrical issues.

Coil Cleaning and Inspection

Both the evaporator (indoor) and condenser (outdoor) coils are cleaned and inspected. Dirty coils reduce heat transfer efficiency and force the system to work harder. In the Piedmont, outdoor coils collect pollen, cottonwood seed, and grass clippings that significantly impede airflow.

The evaporator coil is checked for signs of biological growth, which is common in humid climates. If present, it is cleaned with an appropriate antimicrobial solution.

Condensate Drain Clearing

The condensate drain line is flushed and cleared. In Piedmont summers, AC systems can produce 5 to 20 gallons of condensation per day. A clogged drain can cause water damage and system shutdowns. The drain pan and safety switch are also inspected.

Thermostat Calibration

The thermostat is tested for accuracy and proper communication with the system. Temperature readings are verified, and the system's response to thermostat commands is confirmed. For smart thermostats, settings are reviewed to ensure they are optimized for efficiency and comfort.

Ductwork Inspection

Accessible ductwork is inspected for leaks, disconnections, and damage. In homes with ducts in the attic, duct leaks are one of the largest sources of energy waste. A tune-up inspection identifies obvious problems, and duct sealing or repair can be scheduled if significant issues are found.

Airflow measurements at supply registers help identify blockages, collapsed flex duct, or damper issues that reduce system performance.

Is a Tune-Up Worth the Cost?

In the Piedmont, where systems run extensively from May through September, a tune-up typically pays for itself. Improved efficiency reduces your electricity bills. Catching failing components early avoids expensive emergency repairs. And consistent maintenance extends the operational life of equipment that costs thousands to replace.

A maintenance plan that includes two annual tune-ups (pre-cooling and pre-heating season) provides the best protection and the best value over the life of your system.

Related Services

• schedule your tune-up
• maintenance plan options

Frequently Asked Questions

How much does an AC tune-up cost?

A professional AC tune-up in the Piedmont typically costs between $89 and $150 for a single visit. Maintenance plans that include two annual tune-ups plus priority scheduling and repair discounts offer the best overall value.

How often should I get my AC tuned up?

At minimum, once per year before cooling season. In the Piedmont's demanding climate, a second tune-up before heating season is recommended. Maintenance plans automatically schedule both visits.

Talk to a Technician

Call Davidson Heating & Air at 336-357-5583. Serving homes and businesses since 1984.