You schedule a tune-up. A tech shows up, spends 45 minutes to an hour at your house, and hands you a receipt. But what did they actually do? Was it worth it? Would you know the difference between a thorough tune-up and a quick once-over?
Here is exactly what our technicians do during a spring AC tune-up — step by step — and the most common problems we find in Gulf Coast homes.
Step 1: Thermostat Check
We start inside. We verify your thermostat is reading accurately, cycling correctly, and communicating with the outdoor unit. We check the temperature differential between what the thermostat reads and what the actual room temperature is.
What we commonly find: Thermostats mounted on exterior walls giving false readings — a bigger problem on the coast where exterior wall temperatures fluctuate with Gulf breezes and direct sun. Smart thermostats that lost calibration after power surges from coastal storms. Humidity settings that are wrong for Gulf Coast conditions — your thermostat should be managing humidity, not just temperature.
Step 2: Air Filter Inspection
We check your filter condition, size, and fit. A dirty filter is the single most common cause of AC problems, and a filter that does not fit properly lets unfiltered air bypass into the system.
What we commonly find in Gulf Coast homes: Filters that are damp or showing early mold growth — Galveston's humidity creates conditions you do not see inland. Filters clogged with salt-air particulate that looks like fine white dust. One-inch filters in systems designed for four-inch — restricting airflow and making your system fight even harder against Gulf Coast humidity.
Step 3: Indoor Coil and Drain Inspection
We inspect the evaporator coil for dirt buildup and the condensate drain line for clogs. On the Gulf Coast, this is arguably the single most important step in the entire tune-up.
What we commonly find: Condensate drain lines clogged with algae and biofilm — Galveston's humidity feeds this growth year-round, not just in summer. Your AC removes 5-10 gallons of moisture from the air per day during peak season. If that drain is even partially blocked, you get water damage. Evaporator coils with mold growth on the surface from the constant humidity. Drain pans with standing water that has become a breeding ground.
We flush the drain line and treat it with anti-algae solution to prevent buildup through the summer.
Step 4: Electrical Component Testing
We measure voltage, amperage, and test capacitors against their rated values. We inspect contactors for pitting or arcing, check wiring for heat damage or corrosion, and verify the control board is functioning properly.
What we commonly find: This is where coastal living shows its teeth. Salt air corrodes electrical connections 2-3 times faster than inland environments. Capacitors fail earlier because the outdoor unit runs harder and longer in Gulf Coast heat. Contactors with green corrosion on terminals that increases resistance and causes overheating. Wiring connections that looked fine last year but have corroded enough to cause intermittent failures.
We clean corroded connections and apply anti-corrosion treatment where needed.
Step 5: Outdoor Unit Cleaning and Inspection
We clean the condenser coil, inspect the fan motor and blade, check the refrigerant line insulation, and clear debris from around the unit.
What we commonly find: Salt deposits on the condenser coil fins. This is the number one accelerated wear factor for Gulf Coast HVAC systems. Salt buildup acts like insulation on the coil — preventing heat transfer and forcing the compressor to work harder. Over time, it corrodes the aluminum fins and copper tubing. A salt-caked coil can reduce efficiency by 30% or more.
We also find condenser fins bent or corroded from salt exposure, fan blades with corrosion pitting that causes vibration, and cabinet panels with rust — especially on the side facing the Gulf.
We chemically clean the coil with a solution rated for coastal conditions and rinse thoroughly.
Step 6: Refrigerant Check
We measure suction and discharge pressures and calculate superheat and subcooling to verify your refrigerant charge is correct.
What we commonly find: Slow leaks at brazed joints where salt corrosion has weakened the connection. Systems running slightly low — which in Galveston is a bigger problem than inland because your AC runs so many more hours per year. A system with a marginal charge that works fine in April will not keep up in August when it is 100°F with 80% humidity.
We also check for older systems still running R-22 (Freon) and advise on replacement timeline.
Step 7: Airflow Verification
We measure the temperature split between return and supply air (should be 15-20°F for cooling) and check static pressure to make sure the blower is not fighting excessive resistance.
What we commonly find: Temperature splits that look normal by the numbers but feel wrong because of humidity. A Gulf Coast system needs to run long enough to dehumidify — if it is oversized (common in Texas new construction), it short cycles and never removes enough moisture. High static pressure from ductwork in attics that has sagged or disconnected in the heat — attic temperatures in Galveston regularly exceed 140°F in summer.
Step 8: Safety Checks and System Test
We run the full system through a cooling cycle, verify it starts, runs, and shuts off properly. We check for unusual noises, vibrations, or odors. We verify the disconnect is not corroded and the system is safe to operate through the season.
What a Tune-Up Catches (Real Examples)
Here are actual findings from spring tune-ups we have performed on the Gulf Coast:
- Galveston home, 2012 Carrier system: Condenser coil fins 40% corroded from salt exposure. Compressor running 22% above rated amps trying to compensate. Without coil cleaning and fin repair, the compressor had maybe one more summer. Coil service: included in tune-up. Compressor replacement: $2,000-$3,500.
- League City home, 2016 Lennox system: Condensate drain completely blocked with algae. Drain pan overflowing into the air handler cabinet, causing rust at the base. Drain flush: included in tune-up. Air handler replacement from water damage: $3,000-$5,000.
- Texas City home, 2009 Goodman system: Every electrical connection in the outdoor unit showing green corrosion. Two wire terminals had corroded to the point of intermittent contact — system cutting in and out randomly. Connection cleaning and treatment: $100-$175. If left until a terminal arced and damaged the control board: $500-$1,000.
When to Schedule
February or early March. Here is why:
- You need your AC earlier than you think. Galveston regularly sees 85°F in March. By April you are running it daily. By May you cannot live without it.
- Salt accumulation peaks over winter. Winter storms and salt spray coat your outdoor unit for months. Spring cleaning removes that buildup before it spends another summer baking onto the coils.
- Schedules fill fast. By April, every HVAC company in Galveston County is booked with emergency calls from systems that did not get maintained. Tune-up appointments get pushed to June.
What It Costs
Our Comfort Club members get two tune-ups per year (spring + fall) included, plus priority scheduling, no diagnostic fees, refrigerant credits, and system replacement credits. Contact us for current plan pricing.
The math: a low monthly plan that catches a corroded connection before it fries a $500-$1,000 control board pays for itself in the first visit. On the Gulf Coast, where salt air accelerates every failure mode, maintenance is not optional — it is the difference between a system that lasts 8 years and one that lasts 15.
Call us at (409) 599-1948 to schedule your spring tune-up.
