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How to Tell if Your AC is Running Efficiently

Key Takeaways

Ensuring Your AC Runs Efficiently:

  • Proper Timing: Always test your AC’s efficiency on a hot day, ideally when temperatures exceed 80 degrees. This provides the most accurate assessment of how well your system can handle extreme heat.
  • Adequate Operation Time: Allow your AC to run for at least 15 minutes before assessing. This period helps the system reach a stable state, ensuring you get a reliable reading of its cooling capabilities.
  • Accurate Measurement: Use a thermometer to check the air temperature at the closest supply register and then at a return vent. This will show you the cooling power of your AC by indicating how much it reduces air temperature.
  • Efficiency Check: An efficient AC should cool the air by 15-20 degrees as it moves through the system. If your readings fall within this range, your AC is likely running efficiently.
  • Seal Your Home: Ensure that doors and windows are closed while your AC is operating to prevent cooling the outdoors, which drastically reduces efficiency.
  • Professional Help: If your AC is not blowing cold air or fails to reach the necessary temperature reduction, it may indicate issues like refrigerant leaks or the need for a new filter. These are problems best handled by professionals.

Is your AC not blowing cold air? Wondering if it’s time to fix your AC in Las Vegas? Maintaining an efficient air conditioning system is key to staying comfortable and keeping your energy bills in check, especially in the heat of Las Vegas. Here at Evolve Air Conditioning, Heating, & Plumbing, we understand the importance of a well-functioning AC unit and are here to help ensure yours is operating at its best.

4 DIY Steps to Check Your AC’s Efficiency

Choose the Right Day

Begin by turning on your AC on a day when temperatures soar above 80 degrees. This is crucial to get an accurate reading of how your system handles the heat.

Run Your AC

Let your unit run uninterrupted for at least 15 minutes. This allows the HVAC system to stabilize and start cooling your home effectively.

Measure the Output

Place a thermometer on the supply register closest to the AC unit. This location provides the most accurate reflection of the air the AC is cooling. Leave the thermometer in place for at least five minutes to allow it to adjust to the air flow.

Compare Temperature Readings

After measuring the air output near the AC unit, repeat the process on a return vent (where the cool air exits into your home). A properly functioning AC should cool air by 15-20 degrees compared to the air entering the unit. If the temperature drop is within this range, your AC is likely running efficiently.

Ensuring Full Efficiency

Remember, your AC can’t operate efficiently if it’s trying to cool the great outdoors! Make sure doors and windows are securely closed while your system is running. This not only helps with energy efficiency but also improves indoor air quality by managing what enters and exits your home.

If you’re experiencing issues such as your AC not blowing cold air, or if your unit doesn’t achieve the 15-20 degrees temperature drop, it might be time to call in the experts. You could have a refrigerant leak, need a new filter, or require other maintenance services that only a professional can provide efficiently.

Need an AC Fix in Las Vegas?

Don’t let a malfunctioning air conditioner make you sweat. Call Evolve Air Conditioning, Heating and Plumbing at 702-809-6617 to schedule an evaluation of your home comfort system. We’re here to help ensure your AC is efficient, effective, and ready to tackle whatever the Las Vegas weather throws at us. 


How often should I check the efficiency of my AC unit?

We recommend checking the efficiency of your AC unit at least once a year, ideally before the peak summer season starts. This ensures your system is ready to handle the high temperatures and can operate efficiently when you need it most.

What signs indicate that my AC is not running efficiently?

Several signs can indicate an efficiency issue with your AC, including:

  • Higher than usual energy bills
  • The AC not cooling your home evenly or sufficiently
  • Increased humidity levels inside your home
  • Frequent cycling on and off of the AC unit
  • Unusual noises or odors coming from the AC system

What is the ideal temperature drop I should expect from a well-functioning AC?

A well-functioning AC should typically cool the air by 15-20 degrees compared to the air entering the unit. If the temperature drop is less than this, it may indicate that your AC needs maintenance.

Why is it important to close doors and windows while the AC is running?

Keeping doors and windows closed while your AC is running is crucial for maintaining efficiency. Open doors and windows allow cool air to escape and warm air to enter, which forces your AC to work harder and consume more energy while reducing its overall efficiency.

Can a dirty filter affect my AC’s efficiency?

Yes, a dirty filter can significantly affect the efficiency of your AC by restricting airflow and forcing the system to work harder. This not only reduces efficiency but can also lead to other problems, such as poor cooling performance and increased wear on the system. Regularly replacing or cleaning your AC’s filter according to the manufacturer’s instructions is essential for maintaining optimal efficiency.

When should I call a professional for an AC fix in Las Vegas?

You should call a professional if your AC is not blowing cold air, if there’s a significant decrease in performance, or if you notice any of the signs mentioned above. At Evolve Air Conditioning, Heating, & Plumbing, we offer expert services to diagnose and repair any issues, ensuring your system is running efficiently and effectively.


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