What Happens During a Professional HVAC Tune-Up?

What a tune-up is, and is not

A tune-up is preventive maintenance. A quick glance at the outdoor unit and a thermostat check is not a real tune-up. A thorough visit includes cleaning where needed, measurements with instruments, and a plain-language report of what the technician found. It is meant to keep the system running safely and efficiently, and to identify parts that are likely to fail soon.

Typical steps in a cooling tune-up

1. 1Review of your concerns, such as noises, weak airflow, high bills or humidity.
2. 2Thermostat check, including calibration, settings and operation.
3. 3Air filter inspection and replacement if needed.
4. 4Outdoor unit inspection, including the condenser coil, fan blades, cabinet and the pad it sits on.
5. 5Condenser coil cleaning when needed.
6. 6Electrical inspection, tightening connections and checking wire condition and contactor wear.
7. 7Capacitor testing with a meter to confirm the microfarad rating is within the manufacturer's tolerance.
8. 8Motor checks on the condenser fan and indoor blower, including amp draw and lubrication where applicable.
9. 9Evaporator coil and blower inspection, accessing them where practical.
10. 10Condensate drain check, clearing the line if it is slow and testing the float or overflow switch.
11. 11Temperature split measurement, comparing air entering and leaving the evaporator coil.
12. 12Static pressure and airflow measurement to see whether ducts and filters restrict airflow.
13. 13Refrigerant system check, including pressure and temperature readings, superheat and subcooling, and a look for signs of leaks such as oil stains.
14. 14Inspection of the refrigerant line insulation and visible ductwork connections.
15. 15Final operation check and a summary of findings and recommendations.

Additional steps for heating

• Gas furnace: inspect burners and ignition, check the flue and venting, test safety controls, inspect the heat exchanger as far as visible access allows, and check for carbon monoxide.
• Heat pump: test the reversing valve, defrost controls and auxiliary heat elements.
• Electric heat: inspect elements, sequencers, relays and breakers.

What a tune-up can catch

• A weakening capacitor before it fails on a 100-degree afternoon.
• A pitted contactor that is about to stick or fail.
• A slow drain that could overflow into your ceiling.
• A dirty coil that is reducing capacity and raising your bills.
• Low refrigerant charge indicating a leak.
• Poor airflow from dirty blower wheels or restricted ducts.
• Safety issues on a furnace, such as a cracked heat exchanger or venting problems.

What you can do before the technician arrives

1. 1Write down any symptoms: noises, smells, uneven rooms or humidity.
2. 2Clear space around the indoor and outdoor units so the technician can reach them.
3. 3Replace a very dirty filter, or have the new one ready.
4. 4Secure pets and let the technician know about any access issues, such as an attic ladder.
5. 5Have your system's age and any past service records handy.

When to schedule

In the Houston area, spring before the heat is a smart time for a cooling tune-up, and fall before the first cold stretch suits a heating check. Because the system works through such a long cooling season, some homeowners choose two visits a year. Booking before the busiest weeks can mean a more flexible schedule and a more thorough visit.

Is it worth it?

Regular maintenance is typically a small cost relative to a major breakdown, and some manufacturer warranties require documented maintenance. A well-kept system also tends to run more efficiently and last longer. The value depends on the quality of the visit, so ask what is included and whether measurements are recorded.

Upfront AC & Heating lists a spring and fall maintenance combo, billed as one trip per year for a full tune-up, at $189 on its pricing page, along with an additional-unit price for multiple systems at the same location. See current prices on our Upfront Pricing page, since they can change.