If your A/C breaks down, try these 5 DIY fixed

Uh-oh… it’s that sinking feeling you get when you realize your AC isn’t working.

Maybe you’re not getting cold air, or maybe your AC isn’t running at all.

We know those scenarios are the worst—especially in the middle of summer when you depend on your AC the most. Luckily, as a homeowner, you can take some steps to try and fix your AC before you call a pro.

We’ll share 5 DIY tips you can try when your AC stops working. Let’s start by looking at what to do when your AC isn’t running at all…

Note: If you ever notice excessive water coming from the indoor unit or you hear strange noises you should skip these tips and call a professional immediately.

AC stops running? Try these steps…

If you try these DIY tips but can’t fix the issue, then call a professional for help.

#1: Check your thermostat

The first thing you should always check when you’re having an AC issue is the thermostat.

Why? Well, your thermostat is like the “brain” of the whole system. If it’s not working correctly, or if it is set to an incorrect setting, then your air conditioner won’t perform well (or at all).

So, go to your thermostat and check the following:

  • Make sure you can see the screen (if you have a digital model). If you can’t, you may need to replace the batteries.
  • If you can see the screen, verify that the thermostat is set to COOL, not OFF or HEAT.
  • Check the desired temperature to make sure it’s set at least 5° F below the room temperature.

#2: Check the circuit breaker

Sometimes air conditioners (especially older ones) will pull in a large amount of electrical current at start-up, which could trip the circuit breaker and prevent your AC from turning on.

air conditioner circuit breaker
Circuit breakers in an electrical panel

Go to your electrical panel and check the AC breaker. If it is “tripped” flip it back to the “ON” position.

Note: If the circuit breaker continues to trip, don’t keep resetting it—call a professional to fix whatever is causing the circuit breaker to trip.

AC is blowing warm air? Try these steps…

If you try these DIY tips but can’t fix the issue, then call a professional for help.

#1: Check your thermostat

on vs auto blower fan setting on ac thermostat
Set your thermostat to AUTO

Make sure your thermostat is set to AUTO and not ON. In the ON setting, your AC fan will run non-stop—even when your AC system isn’t cooling your home’s air. When your thermostat is set to ON, you may notice that the air coming from your vents isn’t as cold.

On the other hand, when you set your thermostat to AUTO, your AC fan will only run while your system is cooling air.

#2: Change your filter

Believe it or not, your air filter may be what’s preventing your air conditioner from blowing cold air into your home.

You see, if your air filter is dirty, it acts as a barrier that blocks air from entering your system to be cooled. When your AC isn’t getting enough air, it limits the cold air that it can push back into your home.

dirty vs clean ac air filter
Clean filter vs dirty air filter

If your filter looks dirty like the one on the right, change it. During the summer we recommend checking your filter every month and replacing it when it’s dirty.

#3: Look at the condenser coils

The AC condenser coils (pictured below) are located in the outdoor unit.

Condenser coils in the outdoor unit

The purpose of the condenser coils is to dump out the heat that the refrigerant collects from your home’s warm air. You can think of your AC system as a sponge: it absorbs heat and then dumps it out via the condenser coils.

However, if the condenser coils are dirty or blocked by shrubbery, then it creates a barrier that makes it harder to release that heat, which makes it harder for your AC system to cool your home’s air.

Tree blocking condenser unit

Do this: Clear any grass, leaves or sticks that are covering the coils. You may also needs to trim nearby plants so that there is at least 3 feet of space surrounding the outdoor unit.

If you notice that the condenser coils are covered in a thick layer of dust, contact a professional to clean them for you.

The best way to prevent AC issues? Get your annual tune-up

During an annual maintenance visit, a professional will clean your AC and check for potential problems to prevent expensive AC repairs and breakdowns.

Getting regular AC tune-ups also…

  • Helps your AC provide better comfort
  • Lowers your energy bills (by up to 15% per month)
  • Increases the overall life of your air conditioner

Need to schedule your AC maintenance?