Austin AC Not Cooling? Check These First
In Austin, the #1 reason your AC stops cooling is a clogged air filter — especially during cedar season (Dec–Feb) when pollen clogs a new filter in 2 weeks. The #2 reason is a tripped breaker from summer thunderstorms. Both are free fixes. Before you spend $75–$180 on a diagnostic, run through these Austin-specific checks.
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Austin-Specific Causes (In Order of Likelihood)
1. Clogged Air Filter (Cedar Pollen)
$5–$15Cedar pollen is Austin's filter killer. A brand new MERV 11 filter turns solid gray in 2 weeks during peak season. A clogged filter restricts airflow, freezes evaporator coils and stops cooling. Pull the filter — if it's gray/brown/solid, replace it. During cedar season (Dec–Feb), check every 2 weeks.
2. Tripped Breaker
$0Austin thunderstorms cause power surges. Check both HVAC breakers (indoor unit and outdoor unit have separate breakers). Flip fully off, wait 30 seconds, flip back on.
3. Frozen Evaporator Coils
$0–$450Caused by dirty filter or low refrigerant. Check copper lines going into your air handler — ice visible? Turn to FAN ONLY for 2–3 hours to thaw. Replace filter. Restart in COOL mode. If it freezes again, you have a refrigerant leak ($225–$1,600) — possibly from limestone foundation shifting.
4. Capacitor Failure
$120–$450Outdoor unit hums but fan doesn't spin. Dead capacitor. Austin's 100°F+ heat kills capacitors faster. This requires a tech — capacitors store lethal voltage.
5. Refrigerant Leak (Limestone Issue)
$225–$1,600Unique to Central Texas: limestone soil expansion/contraction cracks copper refrigerant lines. Symptoms develop slowly — cooling gets gradually weaker over days/weeks, ice appears on outdoor lines. Electronic leak detection ($150–$300) locates the crack. Repair depends on location and accessibility.
When to Call a Tech vs DIY
If you've checked the filter, breaker and thermostat and the system still won't cool — it's time to call a tech. Capacitor failures, refrigerant leaks and compressor issues all require a licensed HVAC professional with proper tools and certifications. Don't try to open the outdoor unit yourself. Capacitors store lethal voltage even when the breaker is off.
Expect to pay $75-$180 for a diagnostic visit. Most Austin HVAC companies waive the diagnostic fee if you approve the repair. Ask before scheduling. Same-day service is available during off-peak months (October through March). During summer, expect 1-3 day wait times for non-emergency calls. If your home reaches dangerous indoor temps above 90°F, call for emergency service — $125-$225/hr but response time drops to 1-2 hours.
Austin-Specific Maintenance Tips
Cedar season runs December through February. During these months, check your filter every two weeks. A clogged filter is the fastest path to a frozen evaporator coil and a system that blows warm air. Keep the outdoor condenser unit clear of debris — live oak leaves, cedar pollen and cottonwood fluff coat the fins and reduce efficiency by 15-20%.
Schedule an annual tune-up in February or March. After cedar season ends but before summer demand hits. A tune-up runs $79-$140 and catches weak capacitors, low refrigerant and dirty coils before they become $500+ emergency repairs in July.
Austin Energy offers rebates up to $1,500 for qualifying system replacements. If your system is 12+ years old and needs a repair over $1,000, run the numbers on replacement. A new 16 SEER2 system costs $4,500-$8,000 after rebates and cuts energy bills 20-30% compared to an aging 10-12 SEER unit.
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