A few signs indicate it may be time for an AC replacement. The first is age - if your unit is more than 10-15 years old, it may not be running as efficiently as it once did. Other signs include:   Rising energy bills. Frequent breakdowns. Uneven cooling throughout your home. Strange sounds from your AC unit.   If you're experiencing any of these issues, it's essential to call LAC Heating & Air to assess whether it's time for a replacement. We provide complete AC replacement in Whittier, CA, and the surrounding areas.