Your AC is running, the thermostat is set to 72, but your house is sitting at 80 degrees and climbing. In Galveston, this scenario plays out all summer long, and the causes are almost always tied to living on the coast. Salt corrosion on condenser coils is one of the most common issues our technicians diagnose on the island and throughout Galveston County, and it's a problem most inland HVAC companies don't fully understand.
Salt Corrosion: The Coastal AC Killer
Your outdoor condenser unit pulls air across aluminum fins to dissipate heat. On the Gulf Coast, that air carries salt particles from the Gulf of Mexico. Over time, salt deposits eat through the aluminum, creating tiny holes and pitting that reduce the coil's ability to transfer heat. The result: your system runs and runs but can't reject heat efficiently. Your indoor temperature climbs, your compressor works overtime, and your electric bill spikes. We see this in homes from the Galveston seawall all the way to Dickinson and La Marque, though properties closest to the water get hit hardest.
The fix depends on severity. Light corrosion can be cleaned with a specialized coil treatment and coated to slow future damage. Heavy corrosion, where fins crumble to the touch, means the condenser coil needs replacement, ideally with a marine-grade coated unit that resists salt buildup.
Low Refrigerant From Corroded Line Sets
The copper refrigerant lines connecting your indoor and outdoor units are vulnerable to the same salt air that attacks your condenser. Salt causes pinhole leaks in copper tubing, letting refrigerant escape slowly over weeks or months. You'll notice your AC gradually losing cooling power. Warm air from the vents. Ice forming on the indoor evaporator coil. A hissing sound near the outdoor unit.
Topping off refrigerant without finding and fixing the leak is throwing money away, especially with R-22 already phased out and R-410A being phased down under federal rules. Our techs use electronic leak detectors and nitrogen pressure tests to locate every leak before making repairs. If your line set is corroded in multiple spots, replacing the entire run with coated copper or aluminum lines is the smarter long-term investment.
Clogged Condensate Drains
Galveston's humidity runs high for most of the year. Your AC pulls gallons of moisture from the air daily, and all that water drains through a condensate line. Algae, mold, and sediment thrive in this warm, wet environment. A clogged condensate drain causes water to back up into your drain pan, triggering a safety float switch that shuts your system down entirely. In homes without a float switch, water overflows into ceilings, walls, and insulation.
We clear condensate drains using compressed nitrogen and treat them with antimicrobial tablets. For chronic clog issues, common in older Galveston Island homes with original PVC drain routing, we can reroute the drain with proper fall and add a secondary drain line as a backup.
Capacitor and Electrical Failures
Capacitors are the small cylindrical components that give your compressor and fan motors the jolt they need to start. Gulf Coast heat degrades capacitors faster than moderate climates. A failing capacitor causes your AC to struggle to start, run intermittently, or stop working entirely. You might hear a clicking or humming sound from the outdoor unit. Tropical storm power surges also blow capacitors and can damage compressor windings.
This is one of the more straightforward repairs: a new capacitor typically costs $150 to $300 installed. But it needs to be the correct microfarad rating for your specific unit. We carry common capacitor sizes on our trucks so most repairs are completed in one visit.
Frozen Evaporator Coils
A frozen indoor coil is more dangerous in humid climates like Galveston's. When the ice melts (and it will, either when you turn the system off or when the compressor cycles), all that water has to go somewhere. In dry climates, you get a small puddle. On the Gulf Coast, a thawing coil can release more water than your drain pan and line can handle, especially if the drain is already partly clogged, and that water ends up in ceilings and walls.
Causes include low refrigerant (see above), restricted airflow from dirty filters, or a failing blower motor. The immediate fix is turning the system to fan-only mode and letting the coil thaw completely before restarting. The real fix is diagnosing and correcting the underlying cause.
When Repair Makes Sense vs. Replacement
We'll always give you an honest assessment. For coastal systems, we use a simple guideline: if the repair cost exceeds 40% of a new system's price and the unit is over 8 years old, replacement usually makes more financial sense. Coastal AC systems age faster than inland systems because of salt exposure and longer cooling seasons.
Our $225 Tune-Up Catches Problems Early
Most AC repairs we see could have been prevented or caught early with regular maintenance. Our $225 AC tune-up includes condenser coil inspection and cleaning, refrigerant level check, capacitor testing, condensate drain clearing, and electrical connection inspection, all the failure points specific to Gulf Coast systems. We serve Galveston, Texas City, League City, Dickinson, La Marque, and Santa Fe, with 24/7 emergency repair service when your AC can't wait.
What a Failing AC Costs You
A system that's struggling burns more electricity every day it runs, on top of the repair cost you're putting off. A corroded condenser coil forces the compressor to run nearly continuously, raising your electric bill while delivering worse cooling.
A $400 repair on a failing capacitor and a coil cleaning restores your system's efficiency. A $1,200 refrigerant leak repair can prevent the $3,500 compressor failure that's coming next. Every week you wait pushes the equipment closer to a bigger, more expensive failure than the repair you delayed.
