How to Replace an AC Unit: Comprehensive Installation & Testing Guide

Choosing the Right AC Unit

When selecting an AC unit, consider the following factors:

  • Size matters: Ensure the unit is appropriately sized for your space.
  • Energy efficiency: Look for units with a high Energy Efficiency Ratio (EER) or Seasonal Energy Efficiency Ratio (SEER).
  • Type of unit: Decide between central AC, window units, or portable AC units based on your needs.
  • Budget: Set a budget range and explore units within that price range.
  • Noise level: Check the decibel rating to ensure the unit operates quietly.

Remember, Choosing the Right AC Unit is crucial for optimal cooling efficiency.

Preparing for Replacement

When getting ready to replace your AC unit, there are several key steps to take to ensure a smooth process.

  • Research AC Units: Begin by researching different AC units to find the right one for your needs.
  • Measure Space: Take measurements of the area where the new unit will be installed to ensure a proper fit.
  • Assess Energy Needs: Consider your energy efficiency goals and research units with high EER or SEER ratings for optimal performance.
  • Check Ductwork: Inspect and, if needed, repair or replace any damaged ductwork before installation.
  • Arrange Installation: Contact an HVAC professional to schedule the installation of your new AC unit.
  • Prepare Budget: Set a clear budget range for the replacement, factoring in costs for the unit, installation, and any additional supplies needed.

Click here to preview your posts with PRO themes ››

By taking these preparatory steps, you’ll be well-equipped to seamlessly transition to a new and more efficient AC unit.

Removing the Old AC Unit

When Removing the Old AC Unit, you need to ensure it’s done safely and efficiently. Here are the key steps to guide you:

  • Turn Off Power: Before anything else, make sure to turn off the power to the unit. Safety first!
  • Discharge Capacitor: The capacitor stores electricity, so be sure to discharge it to avoid any unpleasant surprises.
  • Disconnect Wiring: Carefully disconnect the wiring connecting the unit to the power source.
  • Remove Refrigerant: If your unit uses refrigerant, have a professional remove it according to regulations.
  • Unscrew Mounting: Using the appropriate tools, unscrew the mounting bolts holding the unit in place.
  • Lift with Caution: With help if needed, lift the unit out of its position and onto a safe, flat surface.
  • Dispose Responsibly: Once removed, make sure to dispose of the old unit responsibly, following proper guidelines.

By following these steps, you’ll safely and effectively complete the process of removing your old AC unit.

Installing the New AC Unit

Now that you’ve safely removed the old AC unit, it’s time to install the new one. Here’s how to do it:

  • Placement: Choose a location with good airflow and space for maintenance.
  • Leveling: Use a leveling tool to ensure the unit sits evenly on the ground.
  • Connections: Connect the refrigerant lines, electrical wiring, and ductwork securely.
  • Testing: Turn on the power and test the unit to ensure it’s running efficiently.

Remember to consult the manufacturer’s instructions for specific guidance on your new AC unit.

Click here to preview your posts with PRO themes ››

Testing and Maintenance

When everything’s in place, it’s time to test your new AC unit to ensure everything works correctly. Here are the key steps to follow:

  • Turn It On: Start by turning on the unit and setting it to the desired temperature. You should feel cool air coming out of the vents within a few minutes.
  • Check Airflow: Take a walk around your home to confirm that there’s consistent airflow from all vents. Uneven airflow could indicate an issue with your ductwork.
  • Monitor Temperature: Use a thermometer to check the air temperature coming out of the vents. It should align with the temperature you’ve set on the thermostat.
  • Inspect for Leaks: Look out for any water leaks around the unit or on the connecting pipes. Address any leaks promptly to prevent water damage.
  • Change Filters: Regularly check and replace the filters in your AC unit. Clogged filters can reduce efficiency and lead to costly repairs.
  • Schedule Maintenance: Consider scheduling professional maintenance at least once a year to keep your AC unit running smoothly.

Remember, proper Testing and Maintenance are crucial for maximizing the lifespan and efficiency of your new AC unit.


You’ve now learned the essential steps for replacing your AC unit safely and effectively. Remember to follow the manufacturer’s instructions closely to ensure a successful installation. Testing the new unit, checking airflow and temperature, and staying on top of maintenance are key to keeping your AC running smoothly. By taking these precautions, you’ll enjoy a cool and comfortable home environment for years to come. Keep up with regular filter changes and schedule professional maintenance to maximize the efficiency and lifespan of your new AC unit. Your diligence in testing and maintaining your AC system will pay off in the long run.

Click here to preview your posts with PRO themes ››

Frequently Asked Questions

How important is it to consult the manufacturer’s instructions when replacing an AC unit?

It’s crucial to consult the manufacturer’s instructions for safety and proper installation of the new AC unit.

What are the steps for testing a new AC unit after installation?

After installation, test the new AC unit by turning it on, checking airflow and temperature, inspecting for leaks, and ensuring proper functionality.

Why is changing filters regularly important for AC units?

Changing filters regularly helps maintain good air quality, improves efficiency, and extends the lifespan of the AC unit.

How often should professional maintenance be scheduled for AC units?

Professional maintenance should be scheduled at least once a year to ensure optimal performance and longevity of the AC unit.

Charlie Thomson is Appliance Mastery's expert on laundry appliances. With a degree in mechanical engineering and over 8 years of experience in the appliance repair industry, Charlie is a go-to resource for homeowners who want to tackle common issues with their washing machines, dryers, and dishwashers.

Leave a Comment

Send this to a friend