Somerset, TX HVAC Repair: AC Runs but Won’t Cool

Estimated Read Time: 9 minutes

If your air conditioner is running but not cooling, you are not alone. In San Antonio summers, this issue shows up right when you need cold air most. Below are the seven most common reasons your AC blows warm, how to troubleshoot safely, and when to call Eagle Heating & AC for fast, flat‑rate repairs backed by a real 1‑year warranty. Members enjoy a $39 service call and priority scheduling.

Quick Safety Check Before You Start

Before you troubleshoot, do three things:

1. Confirm the thermostat is set to Cool and the fan set to Auto. Replace low batteries.
2. Check the breaker panel. Reset any tripped AC or furnace/air handler breakers once. If it trips again, call a pro.
3. Inspect the air filter. If it looks gray or clogged, replace it now. A starved system cannot cool.

Pro tip for South Texas homes: dust and cedar pollen clog filters faster during peak season. Replace 1-inch filters every 30 to 60 days in summer.

"Very professional, on-time, no run-around's, straight to the point and affordable."

1) Clogged Air Filter or Blocked Return

A dirty filter limits airflow, causes coils to freeze, and leaves rooms warm and stuffy. Blocked returns behind furniture create the same problem.

What to do now:

• Replace the filter and let the system run for 1 to 3 hours.
• Make sure return grilles are open and unobstructed.
• If the indoor unit looks frosty or you feel no airflow, turn the system Off for 2 to 4 hours to thaw, then try again. If it re-freezes, you likely have a deeper issue.

Why this matters: Proper airflow keeps the evaporator coil at the right temperature for heat transfer. Starved airflow drops coil temperature below freezing and stalls cooling.

"They checked the entire system and found the issues... made a plan to fix the problem."

2) Dirty Outdoor Condenser Coil

Your outside unit rejects heat from the home. Grass clippings, pet hair, cottonwood, and Hill Country dust insulate the coil so heat cannot escape. The system runs constantly but never catches up.

What to do now:

• Turn power off at the disconnect.
• Gently rinse the coil from inside out using a garden hose, not a pressure washer.
• Clear 2 feet of space around the unit for airflow.

When to call: If the coil fins are matted with grease or you see oil stains, schedule a professional chemical clean and leak check. Eagle’s warehouse-on-wheels trucks carry coil cleaners and fin tools for same-day service.

"Responded to emergency AC repair within a couple hours... All costs were itemized and justified."

3) Low Refrigerant or a Refrigerant Leak

If the system is low on refrigerant, it cannot absorb heat. Symptoms include long run times, lukewarm supply air, and sometimes a hissing sound or icy lines at the outdoor unit.

What to do now:

• Do not keep running the system if the outdoor lines are icing. You can damage the compressor.
• Schedule a professional. EPA rules require certified handling, and the fix is to find and repair the leak, then properly weigh in the charge.

How Eagle helps:

• We service all makes and models.
• We follow manufacturer specs for superheat/subcooling with digital gauges, so your charge is dialed in, not guessed.
• Our flat-rate menu means you see the full repair price before work starts.

"In my case, there was a repair made and a recommendation to replace. The no pressure attitude has earned my business."

4) Frozen Evaporator Coil

A frozen indoor coil blocks airflow and stops cooling. Causes include dirty filters, closed vents, blower problems, or low refrigerant.

What to do now:

1. Turn the thermostat to Off and set the fan to On to speed up thawing.
2. Place towels near the air handler to catch drips.
3. After thawing, restore Cool/Auto. If frost returns, book a diagnostic.

What we check:

• Blower wheel cleanliness and speed settings
• Drain clogs that can splash back and freeze the coil
• Static pressure and duct restrictions

"They quickly diagnosed the issue... completely transparent about the costs... The team worked quickly and efficiently."

5) Thermostat or Control Problems

Miswired thermostats, weak batteries, or incorrect settings can make the system run without cooling. Some smart thermostats also apply aggressive setback strategies that overshoot on hot days.

What to do now:

• Replace batteries and verify the correct system type in settings.
• Confirm the cooling setpoint is at least 5 degrees below room temperature.
• If the indoor fan runs but the outdoor unit is silent, you may have a failed contactor, capacitor, or disconnect. That is a service call.

Why Eagle: Our techs carry contactors and capacitors on the truck for same-day fixes in most cases. We guarantee repairs are fixed right or the repair is free for one year.

"Called this morning... Eagle was able to work me in for today... After they left, I walked away knowing the work was done correctly."

6) Duct Leaks or Closed/Crushed Dampers

Leaky or pinched ducts waste cooled air in attics and garages. In older San Antonio homes, flex duct can sag, and sheet metal seams can separate during roof or attic work.

What to do now:

• Open all supply registers fully and keep furniture away from them.
• Look in the attic for obvious disconnects or crushed flex runs. Do not enter unsafe spaces.

What we do:

• Measure static pressure and temperature split room by room.
• Seal accessible leaks, repair crushed sections, and balance airflow so key rooms get the right CFM.

Benefit: Tight ducts lower run time and energy use, which helps during peak CPS demand days and heat advisories across Bexar County.

"Very competitive pricing for an emergency call! Technicians were courteous and knowledgeable."

7) Aging Equipment or Undersized System

If your system is over 12 to 15 years old, or it was sized for mild weather, it may struggle in triple-digit heat. Texas code-driven attic insulation upgrades or new windows can change load, too.

Signs it is time to consider replacement:

• Frequent refrigerant leaks or compressor issues
• Repair costs over 30 percent of a new system
• Hot upstairs or back bedrooms that never stabilize

How Eagle guides you:

• We present repair and replace options without pressure.
• Financing options include 0 percent APR for 18 months on approved credit.
• We match capacity to your home’s needs and verify airflow after installation.

"Beyond trustworthy... Not pushy at all and made me feel extremely comfortable!"

Simple DIY Checks That Often Restore Cooling

Try these quick wins before you book a visit:

1. Set thermostat to Cool, Fan to Auto, and lower setpoint to 72 to test.
2. Replace the air filter and open all vents.
3. Rinse the outdoor coil and clear debris.
4. Verify the condensate drain is not clogged. Many units have a safety switch that shuts off cooling when the pan fills.
5. Make sure doors and windows are closed. In humid San Antonio evenings, infiltrating air overwhelms the system.

If none of these help after 60 to 90 minutes, schedule a diagnostic. Pro testing prevents damage and pinpoints the exact failure.

When To Call a Professional Right Away

Call Eagle Heating & AC if you notice any of the following:

• Ice on refrigerant lines or the indoor coil
• Outdoor unit humming but fan not spinning
• Burning smell or repeated breaker trips
• Water around the indoor unit or ceiling stains
• System runs nonstop and the supply air feels warm

Why call Eagle:

• Emergency and same-day repairs are available.
• Residential service fee is $79, or $39 for Eagle Club members.
• We service all makes and models and use flat-rate pricing, so you approve the total before work begins.
• Repairs are backed by a 1-year warranty. If a covered repair fails in year one, we fix it again at no charge for the repair.

Prevent Future “Running But Not Cooling” Problems

A little prevention saves breakdowns during a heat wave.

• Join the Eagle Club. Members get two precision tune-ups per year, a $39 service call, 15 percent off repairs, and appointments within 24 hours.
• Replace filters regularly and keep returns clear.
• Schedule a professional coil cleaning and refrigerant performance check before summer.
• Ask for duct inspection if you added rooms, changed windows, or noticed new hot spots.
• Keep 2 to 3 feet of clearance around the outdoor unit, and trim shrubs every season.

What To Expect From an Eagle Heating & AC Service Call

We keep the process simple and transparent:

1. Friendly scheduling with text updates and narrow arrival windows.
2. On-time arrival with shoe covers, work mats, and a clean workspace.
3. Diagnosis using digital gauges and electrical testing, then clear options and flat-rate pricing.
4. Most repairs completed same day from our warehouse-on-wheels trucks.
5. Post-repair run test and education on filter, drain, and thermostat settings.

Hard facts that matter:

• Residential service fee is $79 retail or $39 for members.
• Financing available at 0 percent APR for 18 months on approved applications.
• 1-year repair warranty on covered repairs.

Local insight: In Schertz, Cibolo, and Boerne, attic temps soar well above outdoor readings. That extra heat load exaggerates weak airflow and dirty coils. A spring tune-up pays off when July arrives.

Troubleshooting Matrix: Symptom to Likely Cause

Use this quick map to match what you see to likely issues:

1. AC runs constantly, little cooling
   • Dirty outdoor coil, low refrigerant, duct leaks, or undersized system.
2. Good airflow, but air is not cold
   • Low refrigerant, thermostat or outdoor unit failure, frozen coil unthawing.
3. Weak airflow
   • Clogged filter, iced coil, closed registers, failing blower.
4. Water near indoor unit
   • Clogged condensate drain or frozen coil melt.
5. Outdoor unit quiet, indoor blower running
   • Failed capacitor/contactor, tripped disconnect, or control issue.

If your symptom points to refrigerant, electrical parts, or a frozen coil, book service to prevent larger failures like compressor damage.

Service Area

We proudly serve San Antonio, Schertz, Cibolo, Converse, Boerne, Universal City, Pipe Creek, Helotes, JBSA Lackland, and JBSA Ft Sam Houston. Same-day and next-day slots open up daily. Call early for the best times.

Special Savings and Member Perks

• Eagle Club Members: $39 service call (reg. $79), two precision tune-ups per year, 15% off repairs, 10% off accessories and IAQ, and appointments within 24 hours.
• Flat-rate pricing: Know the full price before we start.
• 0% APR for 18 months on approved financing for replacements if your system is beyond repair.
• Repair protection: "We guarantee that repairs on your equipment are fixed right or the repair is free" for one year on covered repairs.

Call (210) 412-2075 and mention this blog to ask about current schedules and membership benefits.

What Homeowners Are Saying

"I give 5 stars because they fixed my heating system the right way. Since day one they told me the problem and how much it was gonna cost me. I strongly recommend Eagle Heating and AC for all your HVAC problems. Thank you Timo!"

"Great experience. Responded to emergency AC repair within a couple hours. Technician was very professional and experienced. All costs were itemized and justified so I didnt feel like I was taken advantage of. Would easily recommend to others."

"Called this morning and spoke to Erica... Eagle was able to work me in for today and two of the most pleasant technicians showed up... gave me a chart of their pricing... After they left, I walked away knowing the work was done correctly and I actually understood how my HVAC system works!"

"Timely, professional, and reliable... The no pressure attitude has earned my business... Give this company a call, their weekend call was exceptionally fast and low for a Sunday."

Frequently Asked Questions

Why is my AC running but not blowing cold air?

Common causes include a dirty filter, clogged outdoor coil, low refrigerant, a frozen indoor coil, thermostat issues, or duct leaks. Try a new filter and rinsing the outdoor coil. If it still blows warm, schedule a diagnostic.

How long should I wait after changing the filter to feel colder air?

Give it 60 to 90 minutes. If airflow and temperature do not improve, you may have a frozen coil, low refrigerant, or a failing blower that needs professional testing.

Is it safe to run the AC if the outdoor pipes have ice on them?

No. Turn the system Off and set the fan to On to thaw. Running while iced can damage the compressor. Call for service once thawed.

What should my thermostat fan be set to in summer?

Use Auto for normal cooling so the coil can dehumidify. Use On temporarily to help thaw a frozen coil or to circulate air, but not as a long-term setting.

When is replacement better than repair?

If the unit is over 12 to 15 years old, suffers repeat refrigerant leaks, or a repair exceeds 30% of replacement, consider upgrading. We provide options and 0% APR for 18 months on approved credit.

In Summary

An air conditioner that is running but not cooling usually comes down to airflow, dirty coils, refrigerant issues, controls, ducts, or age. Start with a fresh filter and outdoor coil rinse. If your AC still will not cool, Eagle Heating & AC can diagnose and repair the problem the same day in most cases. We serve San Antonio and nearby cities with flat-rate pricing and a 1-year repair warranty.

Ready to Get Cold Air Back Today?

• Call now: (210) 412-2075
• Schedule online: http://eaglehvac-pro.com/
• Member perk: Eagle Club service call is $39 (reg. $79), plus 15% off repairs and priority scheduling.

Book your AC repair and relax. We will arrive on time, show you flat-rate prices upfront, and back the repair for a full year.

About Eagle Heating & AC Eagle Heating & AC is a licensed and insured local team serving Greater San Antonio. We service all makes and models, offer flat-rate pricing, and stand behind our work with a 1-year repair warranty. Members get guaranteed appointments within 24 hours, two tune-ups per year, and repair discounts. Our warehouse-on-wheels trucks help us complete most repairs the same day. Call the pros homeowners trust for honest options and reliable results.