Why did my AC stop cooling?

An air conditioner can stop cooling for several reasons, including a dirty air filter restricting airflow, a frozen evaporator coil, low refrigerant levels, electrical problems, or a failing compressor. Because many of these issues create similar symptoms, a professional inspection is the best way to accurately diagnose the problem and prevent further damage.

Why is my AC not cooling when the outdoor temperature is above 95 degrees?

When outdoor temperatures climb above 95 degrees, air conditioners have to work much harder to remove heat from your home. Extreme heat reduces efficiency, especially if the system is undersized, poorly insulated, low on refrigerant, or overdue for maintenance. Clean coils, proper airflow, and routine service help systems perform better during heat waves.

Should I have to add Freon to my AC unit every year?

No. Refrigerant does not get used up. If refrigerant needs to be added every year, there is a leak somewhere in the system. Continuing to recharge without repairing the leak can damage the compressor and reduce efficiency. A licensed HVAC technician should locate and repair the leak before properly recharging the system

What are the most common HVAC problems?

The most common HVAC problems include clogged air filters, dirty evaporator or condenser coils, low refrigerant, faulty thermostats, failing capacitors, airflow restrictions, and electrical component failures. Preventive maintenance helps identify these issues early and reduces the risk of breakdowns.

What does SEER stand for?

SEER stands for Seasonal Energy Efficiency Ratio. It measures how efficiently an air conditioner uses electricity to cool a home over an entire cooling season. Higher SEER ratings mean better efficiency and lower energy costs.

Why is the SEER rating different from what my salesperson quoted?

SEER ratings are based on a matched combination of the outdoor unit, indoor coil, and air handler or furnace. The final installed efficiency depends on how these components work together. Changing one component can raise or lower the system’s overall SEER rating.

How does an AC unit cool and dehumidify?

Warm, humid air is pulled in through return ducts and passed over the cold evaporator coil. As the air moves across the coil, heat and moisture are removed. The moisture condenses into water and drains away, while the cooled, dehumidified air is circulated back through the home.

What HVAC brand is the best?

There is no single best HVAC brand for every home. Well-known brands like Trane, Carrier, Lennox, Rheem, Goodman, Amana, and Ruud all perform well when systems are properly sized and installed. In most cases, correct installation and airflow matter more than the brand name itself.

What is the life expectancy of my AC unit?

Most air conditioning systems last between 10 and 12 years, depending on maintenance, usage, and installation quality. Systems that receive regular service often last longer, while neglected systems or those with frequent repairs may fail sooner.

Should I repair or replace my AC system?

If your system is more than 10 years old and requires frequent or costly repairs, replacement may be more economical in the long run. Newer systems offer greater efficiency, improved comfort, and lower operating costs than older units.

What size air filter should I use, and which type is best?

The correct filter size is printed on the existing filter or listed in the system manual. Pleated filters and media filters provide better dust and allergen removal than basic fiberglass filters and help protect HVAC components.

Do AC systems and heat pumps need maintenance?

Yes. Regular maintenance improves efficiency, reduces breakdowns, and extends system life. Air conditioning systems should be serviced in the spring, and heating systems should be inspected in the fall.

What are the advantages of a programmable thermostat?

Programmable thermostats help reduce energy use by automatically adjusting temperatures for sleep, work, and travel schedules. This improves efficiency without sacrificing comfort.

What temperature should I set my thermostat to?

Around 72°F is a common comfort setting, though preferences vary. Keeping temperatures steady helps reduce energy consumption. Smart thermostats allow more precise control and remote adjustments.

I hear the blower running, but no air is coming from the vents. Why?

This is often caused by a frozen evaporator coil, clogged filter, or severe airflow restriction. Continuing to run the system can cause damage. Turning the system off and calling for service is recommended.

How cold should the air coming from my vents be?

Air from the supply vents should typically be 17 to 20 degrees cooler than the room temperature. This temperature difference, known as Delta T, helps determine whether the system is cooling properly.

Is it essential to clean the condenser coil?

Yes. The outdoor condenser coil releases heat from the system. Dirt and debris reduce heat transfer, increase energy usage, and can cause the system to overheat or shut down. Annual cleaning is recommended.

What does the AC capacitor do, and why do they fail so often?

The capacitor stores and releases electrical energy to help start and run the compressor and fan motors. Heat, electrical stress, age, and frequent cycling can cause capacitors to fail, making them one of the most common AC repair issues.

What does the compressor do, and is it the most important part of the system?

The compressor pressurizes and circulates refrigerant through the system, allowing heat to be removed from the home. It is often considered the heart of the AC system. Compressor failure is a major repair and can sometimes signal the need for system replacement.

What is the evaporator coil, and does it really need to be cleaned?

The evaporator coil absorbs heat and moisture from indoor air. Dirt buildup reduces efficiency, increases energy use, and can cause freezing. Keeping the coil clean is essential for proper cooling and system longevity.

What is a TXV and how does it work?

A thermostatic expansion valve controls the amount of refrigerant that enters the evaporator coil. If it malfunctions, it can cause poor cooling, frozen coils, and high energy bills. Diagnosis and replacement require professional tools and training.

What is a condensate pump?

A condensate pump removes water produced during the dehumidification process. If it fails, it can cause water leaks or a system shutdown and should be repaired or replaced promptly.

What should the suction pressure be on an R-410A system?

Typical suction pressure for R-410A systems ranges from 110 to 145 psi, depending on indoor temperature and humidity. Abnormal pressures can indicate refrigerant issues, airflow problems, or component failure and should be checked by an EPA-certified technician.