Top Reasons Your AC Unit Is Freezing in Bloomington, CA

Inland Empire Comfort
June 12, 2025
AC repair in Bloomington CA

Noticing an AC coil freezing up? You may rush to schedule AC repair in Bloomington, CA, but do you know what’s causing this surprisingly common air conditioner problem? 


Below, discover five reasons why frozen coils happen so often. 


1. Dirty Air Filters

Clogged HVAC air filters are incredibly problematic for Bloomington homeowners, especially when they create the following issues:


  • Restricted airflow: You can say “goodbye” to cooling relief until you replace clogged filters. Cool air can’t push past a filthy screen, so your home’s indoor air will remain sticky and uncomfortable. 
  • Poor indoor air quality: Trapped dirt and allergens in a filter easily circulate in your breathing air and settle on surfaces.
  • Cooling performance problems: You may need to schedule comprehensive HVAC repairs with clogged air filter-related issues. 
  • Frozen coils: An AC coil freezing up due to restricted airflow is one of the biggest concerns if you run the unit with a clogged filter. 


HVAC experts like Inland Empire Comfort usually recommend replacing filters every one to three months.


2. A Thermostat Malfunction

A frozen air conditioning coil could be due to a malfunctioning thermostat or incorrect settings. This device signals when the HVAC system should turn on and off. If it malfunctions, it could cause your air conditioner to run longer than necessary, resulting in icy coils. 


Start by resetting the temperature and checking your system is on the right setting. From there, you can change the batteries or calibrate the system.


3. Low Refrigerant Levels

Low refrigerant levels are often to blame for an AC coil freezing up. The refrigerant absorbs heat from inside your home and transfers it outside while new, cooler air stays behind. If there isn’t ample refrigerant inside the coil, the tube could freeze over because it isn’t absorbing enough heat to counter the coolant’s work. 


A professional technician should inspect your HVAC equipment to rule out refrigerant leaks, perform repairs, and recharge your system’s refrigerant. 


4. Blocked Return Vents

Many Bloomington homeowners try to save money on cooling costs by closing any vent registers in unused areas, but this is a mistake. Closing vents means restricted airflow, which may result in a coil forming ice crystals. 


Keep every return vent open to seamlessly cool your Bloomington home. Remove any furniture or large objects blocking the vents, too.

 

5. A Lack of HVAC Maintenance

Why is my AC coil freezing up? Ask yourself, “When was the last time I had an HVAC tune-up service?” Air conditioning maintenance is vital for keeping your system in shape and enjoying peace of mind. 


During these appointments, your technician will follow a thorough checklist, including:


  • Cleaning dirty coils
  • Replacing old air filters
  • Testing electrical components
  • Checking thermostat function
  • Topping off refrigerant levels



HVAC experts like Inland Empire Comfort have the tools and know-how to repair problems on the spot. This saves you money on future HVAC repairs and ensures that your unit works properly when you need it most. Schedule a yearly tune-up service to improve system energy efficiency and lifespan and reduce the risk of unexpected breakdowns. 

HVAC Service Provider Bloomington CA

Contact Bloomington’s Trusted HVAC Service Provider for Frozen Coil Help and More

Whether you need to start troubleshooting AC problems or replace a worn-out system, Inland Empire Comfort has your solution. We can identify the cause of an AC coil freezing up, perform repairs, and recommend tips for hassle-free HVAC operations. Our experts have years of experience serving this region and promise to go above and beyond. 


Don’t let a malfunctioning HVAC system impact your comfort – give Inland Empire Comfort a call today!



Frequently Asked Questions

Do you still have questions about air conditioning coils and systems? Learn more below. 


How Often Should I Schedule Air Conditioning Maintenance in Bloomington, CA?

Schedule HVAC system maintenance once a year in Bloomington, California. Preferably, aim to schedule the visit before the start of the cooling season. 


How Can I Troubleshoot a Frozen Air Conditioning Unit?

You can troubleshoot a frozen coil by changing the HVAC air filter, adjusting the thermostat’s settings, and opening closed vents. If these measures don’t help, contact an air conditioning professional like Inland Empire Comfort.


How Long Does It Take for a Frozen Evaporator Coil To Thaw?

It can take up to 24 hours for a frozen evaporator coil to thaw, but it depends on the amount of ice buildup and the ambient temperature. 


What Are the Signs of a Refrigerant Leak?

The usual signs of a refrigerant leak include an AC coil freezing up, frequent system cycling, and limited cooling relief while the unit operates. Never handle refrigerant if you detect a leak.

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