Why Is My AC Freezing Up? 

Jun 1, 2024 | AC, Air Conditioner, Air Filters, Airflow, Freezing, Frozen, Leak, Refrigerant, Temperature, Thermostat, Vents

If your air conditioner is freezing up, you might be puzzled, wondering how this happened. How does an AC unit freeze over in the heat? While this might seem confusing, there are actually multiple reasons why your air conditioning system could be freezing up. Here at Five Star Heating & Cooling Dayton, we have the expertise to help you identify the most common causes and provide troubleshooting steps to fix a frozen air conditioner.  

Step 1: Stay Calm   

Before we begin, we want to reassure you that everything is under control. We will navigate this together. Rest assured, your Five Star Heating & Cooling Dayton family is here to support you and assist if needed. Stay calm, and let’s resolve this together. 

Step 2: Begin Troubleshooting   

Insufficient Airflow   

Issue: Reduced airflow could cause your AC to freeze if it’s unable to function correctly. Keep in mind that clogged air filters or closed vents could impede airflow, leading to the buildup of cool air and causing the AC’s refrigerant to condense on top of the coils. 

Solution: To ensure optimal performance, regularly inspect and replace your air filters as needed. Additionally, make sure all vents in your home are open and free from obstructions that could hinder airflow. 

Take Note: To ensure optimal performance, we recommend changing your air filters every 1-3 months, depending on the type of filter.  

Incorrect Thermostat Settings   

Issue: It’s possible that your thermostat settings are too low. If your home’s temperature is set excessively low, your air conditioner might struggle to maintain the constant cycle of extremely low temperatures. Making sure your thermostat is set correctly can help optimize your system’s performance.  

Solution: Adjust your thermostat to a higher setting. Additionally, consider investing in a smart thermostat to efficiently monitor and manage your home’s temperature, reducing strain on your air conditioner. By using a smart thermostat, you can preprogram your preferred cool settings for the week, ensuring your home is comfortable and ready for relaxation upon your arrival. 

Imbalanced Refrigerant Levels   

Issue: Maintaining proper refrigerant levels is crucial to prevent your AC from freezing. This is because incorrect coolant levels can lower the evaporator’s temperature excessively, causing moisture to freeze and result in ice buildup. If you’re experiencing this issue, it’s essential to consult a professional to ensure your system’s efficiency and longevity. 

Solution: When it comes to AC refrigerant, you should let a professional handle any refrigerant issues. Our licensed HVAC technicians have the right equipment to safely check and manage your AC’s refrigerant levels. So, if you suspect a problem with your refrigerant, give us a call. We’re here to ensure your system operates at peak performance. 

It’s good to be aware of the signs of low AC refrigerant: 

  1. Warm air blowing from vents: If your HVAC system is blowing warm air instead of cool, it’s a clear indicator of refrigerant problems. 
  1. Ice buildup on the evaporator coil: Ice forming on the evaporator coil suggests refrigerant levels are too low, hindering the system’s ability to absorb heat. 
  1. Hissing or bubbling noises: Unusual sounds like hissing or bubbling can signal a refrigerant leak, which needs to be addressed by a professional. 
  1. Higher energy bills: A sudden spike in your energy bills can mean your system is working harder than necessary due to insufficient refrigerant. 
  1. Inconsistent cooling: If some areas of your home are cooler than others, it could be due to refrigerant issues affecting your HVAC system’s efficiency. 

Step 3: Defrost Your Unit   

Once you’ve identified ice on your AC unit, proper measures can be taken to restore its functionality. First, let the ice thaw completely. For a thorough resolution, consult our expert team to ensure your AC operates at peak performance. 

To defrost your AC properly:  

  1. Turn off your air conditioner at the thermostat. 
  1. Switch the fan setting from ‘auto’ to ‘on’ to initiate the defrosting process. 
  1. Monitor the water from melting ice. Ensure that significant amounts of melting ice won’t cause water damage to the surrounding area. 
  1. Exercise patience. Thawing can take from a few hours to an entire day, depending on the amount of ice present. 

Step 4: Consult a Professional   

If you’re struggling to identify the cause of the freezing, facing a refrigerant issue, or dealing with recurring problems, it’s time to consult a licensed HVAC professional. Addressing this issue promptly is crucial to prevent unnecessary strain on your air conditioning unit and avoidable damage. Don’t delay—ensure your system runs smoothly by seeking expert help today. 

We offer 24/7 emergency services to keep you and your home cool. Call Five Star Heating & Cooling Dayton today at (937) 708-8278, or schedule an appointment online now by clicking here