Why Your AC Isn’t Cooling Properly — 6 Common Causes and Fixes

When your air conditioner runs but doesn’t cool your home, it can quickly turn a normal Florida afternoon into a sticky, uncomfortable nightmare. Whether you’re in Hollywood, Hallandale Beach, Miramar, or Pembroke Pines, this is one of the most common calls we receive at CoolBreeze AC & Heating. The good news? Most causes are fixable — often before they lead to a full system breakdown.

1. Dirty or Clogged Air Filters

One of the simplest — and most overlooked — reasons an AC stops cooling is a dirty filter. When filters get clogged, air can’t flow properly through the system. That restriction causes your AC to struggle, run longer cycles, and blow warmer air. Replace or clean your filter every 30 to 60 days, especially during Broward County’s humid summer months.

2. Low Refrigerant Levels

Your AC uses refrigerant to absorb heat from the air inside your home. If you’re low on refrigerant, it’s usually due to a leak — not because it “ran out.” Leaks can develop in the coils or lines, reducing cooling performance and sometimes freezing the evaporator coil. Schedule AC repair in Hollywood if you suspect a leak; our licensed technicians can test, repair, and recharge your system safely.

3. Dirty Condenser Coils

The condenser coils in your outdoor unit release the heat removed from your home. When these coils get covered in dirt, debris, or grass clippings, heat transfer becomes inefficient — making your AC blow warm air. A professional cleaning can restore your system’s performance and help prevent overheating. Homeowners in Hallandale Beach often notice this issue after long, dusty spring months.

4. Faulty Thermostat or Sensor Issues

If your thermostat is misreading the room temperature or your sensor has shifted, your AC may cycle off before your home reaches the desired temperature. Always check your thermostat settings first. If the issue continues, it’s best to have an expert inspect the sensor and wiring to prevent short cycling or energy waste.

5. Frozen Evaporator Coil

A frozen coil blocks airflow and prevents your AC from cooling properly. Causes can include low refrigerant, restricted airflow, or dirty filters. Turn off the system immediately and let it thaw before restarting. For a lasting fix, call our Miramar AC repair experts to inspect for leaks or airflow problems.

6. Aging or Oversized System

Even a perfectly maintained unit loses efficiency over time. If your system is more than 10–12 years old, or if it was sized incorrectly for your home, it might struggle to cool evenly. Modern high-efficiency units can lower energy costs and improve comfort dramatically. Our team provides honest evaluations and AC replacement in Pembroke Pines when repairs are no longer cost-effective.

Keep Your Cool with Preventive Maintenance

Most AC problems start small — and that’s why preventive maintenance is so important. Regular tune-ups keep your coils clean, filters replaced, and refrigerant levels in check. Whether you’re scheduling service in Hollywood, Hallandale Beach, Miramar, or Pembroke Pines, the CoolBreeze AC & Heating team is ready to help you beat the heat before summer arrives.