Why Isn’t My AC Cooling? Common Summer HVAC Problems in San Diego County

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🧊 Why Isn’t My AC Cooling Properly?

When your air conditioner stops cooling like it used to, it’s not just uncomfortable — it could be a warning sign. At My Guy Heating, Air & Plumbing, we’ve helped thousands of homeowners across San Marcos, Carlsbad, and all of North County figure out what’s really going wrong with their HVAC systems.

Below, we’ll walk through the most common reasons your AC isn’t keeping up — and what you can do about it.

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Why is my AC running but not blowing cold air?

If your system turns on but the air coming out is warm or weak, here are the usual suspects:

• Dirty air filters restricting airflow
• Frozen evaporator coils from poor airflow or low refrigerant
• Thermostat issues not telling the system to cool properly
• Low refrigerant levels from a leak
• Electrical or capacitor problems in the outdoor unit

Many people don’t realize: a simple clogged filter or weak capacitor can cripple an otherwise healthy AC system.

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How can I tell if my AC unit is low on refrigerant?

Some signs:

• It takes forever to cool your home
• Air feels slightly cool but not cold
• You hear hissing or bubbling (a sign of a leak)
• Your energy bills suddenly spike

⚠️ Refrigerant doesn’t “run out” like gas — if it’s low, there’s a leak. Only licensed technicians can legally handle refrigerant in California, so don’t try to recharge it yourself.

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Could my AC just need a cleaning?

Yes — and this is more common than most people think.

Dirty coils, blocked ducts, and clogged filters all reduce cooling power dramatically. If it’s been over a year since your last AC tune-up, the issue could be solved with a deep clean and some basic maintenance.

At My Guy Heating, Air & Plumbing, our $29.95 summer AC tune-up includes:

✅ Filter replacement
✅ Coil cleaning
✅ Electrical and motor inspection
✅ System performance check

Learn more here: https://myguyairsd.com/air-conditioning-tune-up/

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Is this a common issue in San Marcos and North County?

Absolutely. Our technicians see this all summer in:

• San Marcos
• Vista
• Carlsbad
• Oceanside
• Encinitas
• Escondido

California heat puts massive strain on HVAC systems — especially if they’re 10+ years old or haven’t been maintained.

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When should I call a professional?

You should definitely call a tech if:

• You’ve changed the filter and it’s still not cooling
• You see ice forming on the unit
• The outdoor fan isn’t spinning
• Your thermostat isn’t responding

We offer same-week appointments and keep fully stocked vans to fix most issues on the spot.

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Quick AC Checklist Before Calling:

[ ] Change the air filter
[ ] Check thermostat settings
[ ] Make sure outdoor unit is clear of debris
[ ] Look for ice buildup on refrigerant lines

Still not cooling? It’s time to call My Guy.

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Need Help Fast?

Call us at (760) 603-7632 or request service online: https://myguyairsd.com/contact/

We’ll diagnose your AC issue and let you know your best options — no pushy upsells, just honest help from your local team.

📍 Proudly serving San Diego County homeowners with real answers and fast solutions.

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🔥 Special Offer: $29.95 AC Tune-Up

Stay cool this summer! Get a full inspection, filter replacement, and coil cleaning for just $29.95.
Book now: https://myguyairsd.com/air-conditioning-tune-up/