Summer isn’t over yet! Your A/C needs a tune up for the same reason you might get your car tuned up before a long road trip—to make sure that there aren’t any hidden problems that could cause major issues when you need it most.

An A/C tune-up has four key areas that prevents your air conditioner from breaking down. So for each of the four we are going to tell you:

  • What it is about
  • Why it’s important
  • The problems that it helps prevent

Check the refrigerant charge

What it is: Refrigerant is the lifeblood of your air conditioning system. It absorbs the heat from your home and releases it outside. An A/C tune-up will check to make sure that you have the right amount of this important liquid.

Why it’s important: If your A/C has a low refrigerant charge, it won’t be able to remove heat from your home like it should.

This causes several problems:

  • Your A/C blows warm air—Without enough refrigerant, your A/C can’t remove enough heat from your home’s air, resulting in warm air coming into your home.
  • Your evaporator coil freezes over—Without enough refrigerant, your evaporator coil drops below freezing, causing the moisture in the air to condense and freeze on it. This is a serious problem that can damage your A/C if left too long. And it can lead to…
  • Your A/C doesn’t blow hard enough—The flow of air into your home can be blocked (literally) by the block of ice on your coil. And that often results in…
  • Your air conditioner runs constantly—Since the air conditioner can’t adequately cool your home, it may seem to never shut off.

Note: If your A/C is low on refrigerant, your air conditioning technician should fix the leak. Refrigerant isn’t “used up” like gas

Tightening the electrical connections on you’re A/C

What it is: Your air conditioner has many electrical connections in both the inside and outside unit. During an A/C tune-up, the technician will check to make sure all these connections are tight.

Why it’s important: Changes in weather and humidity can cause wires to expand and contract which will make the connections loose. This can cause:

  • Short circuits and arcing—These dangerous electrical conditions can cause your A/C to trip its breaker.
  • Malfunctioning parts—Problems like the A/C fan not spinning are often caused by an electrical problem inside the air conditioner.

Checking the condensate drain line

What it is: When your air conditioner runs, it removes some humidity from your home’s air. This humidity is drained from the A/C as water through a pipe called the condensate drain line.

Why it’s important: When the drain line becomes clogged the water can back up and cause some serious water damage in your home.

Cleaning the evaporator and condenser coils

What it is: Your evaporator coil lives inside your indoor unit. It absorbs heat from your home’s air. That heat is then transferred to your outside unit’s condenser coils, where the heat is released into the air.

As your A/C runs, dirt and dust from your home’s air collects on the evaporator coils inside. Dirt and dust also collect on the outside unit’s condenser coil.

Why it’s important: An A/C with buildup of dirt on the evaporator coils struggles to absorb heat from your home’s air. Likewise, dirty condenser coils struggle to disperse the heat which the evaporator coils collected. This can lead to a host of problems like:

  • Increased energy use—Your air conditioner has to run longer and harder to get your home to your thermostat setting.
  • Constantly tripping breaker—If the condenser coils are covered in dust, dirt and leaves, then the coils can’t properly dissipate heat. So the air conditioner has to work harder and longer to cool your home and so overheats and trips the breaker.
  • Frozen evaporator coil—Dirt blocks airflow over the evaporator coil, causing it to freeze up.
  • An A/C that’s blowing hot air—Dirty condenser coils struggle to get rid of the heat in the refrigerant, which means less heat is pulled from your home’s air, resulting in warm air coming from your vents.


Cool Guys services San Antonio and the surrounding areas. Contact us today to schedule your air conditioner tune-up.

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