Top Reasons Your AC Unit Is Freezing in Bloomington, CA
Inland Empire Comfort
June 12, 2025
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.
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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In Riverside, CA, emergency air conditioning repairs often stem from a combination of deferred maintenance and the relentless demands of our Inland Valley climate. Temperatures in the area regularly climb into the triple digits. When a system fails during a heatwave along the 91 corridor or in neighborhoods like Canyon Crest or Orangecrest, the urgency is immediate. Common warning signs include warm air blowing from the vents, unusual noises, or unexpected odors. Understanding what drives these failures gives homeowners the insight needed to act before a minor issue becomes a full system breakdown. For those dealing with an active cooling emergency, our emergency AC repair services in Riverside are available around the clock. Common Signs Your AC Needs Immediate Attention When temperatures rise across Riverside, the signs that a system is struggling become hard to ignore. 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Electrical storms can cause power surges that damage sensitive system components. High winds carry dust and debris that settle into filters and coils, reducing airflow and efficiency over time. Being aware of how the local climate affects system performance helps homeowners take the right precautions before conditions worsen. Importance of Regular Maintenance to Prevent Emergencies The strain that Riverside's climate places on cooling systems makes regular professional maintenance more than a recommendation. It is one of the most effective ways to avoid an emergency repair during the hottest time of year. Preventive service delivers real, measurable benefits: Minor issues are identified and corrected before they develop into costly repairs. Energy efficiency improves, which helps keep monthly utility costs in check. System lifespan is extended, protecting the homeowner's investment over time. Indoor air quality is maintained through clean filters and properly functioning components. 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Addressing airflow problems early prevents them from developing into larger mechanical failures and keeps the home comfortable through the hottest months of the year. Routine air conditioning maintenance is one of the most effective ways to catch and correct these issues before they become serious. Why Is Your AC Making Unusual Noises? An air conditioning system operating normally should run with relatively little noise. When clanking, buzzing, or hissing sounds become noticeable, it is a reliable sign that something inside the unit requires attention. Clanking typically points to loose components or debris that has made its way into the unit. Buzzing sounds are often associated with electrical issues and should be evaluated promptly due to their safety implications. Hissing is frequently a sign of a refrigerant leak, a problem that reduces cooling capacity and can cause long-term damage to the compressor if left unresolved. 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Indoor air quality also improves when filters are clean, and airflow is unobstructed. Over time, regular service extends the equipment's working life, protecting the homeowner's investment. Skipping maintenance often means paying more later. Unexpected failures during peak summer heat are not only inconvenient but frequently more expensive to repair than issues caught during a routine inspection. Working in homes across the Bloomington area, we see the difference that consistent upkeep makes, especially for systems pushing through another demanding season. Our team provides home air conditioning repair alongside preventive maintenance plans tailored to each system's needs. When to Call Inland Empire Comfort for Emergency Services Some AC problems cannot wait for a next-day appointment. A complete system failure during a heatwave, a refrigerant leak, ice forming on the coils, or strange odors coming from the unit are all situations that call for immediate professional response. These issues carry real risk. A refrigerant leak affects both system performance and air quality. Ice on the coils signals that the system is operating outside of safe parameters. Unusual odors can indicate electrical problems or mold growth within the unit itself. None of these should be left to resolve on their own. Inland Empire Comfort offers 24/7 emergency services for homeowners throughout the Bloomington area and the broader Inland Empire. Our team is known for fast response times and thorough diagnostics, and we arrive equipped to restore comfort quickly. If something seems wrong with your system, acting promptly is always the right call. To get ahead of the next heatwave, schedule your service today and let our team make sure your system is ready.
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HSPF (Heating Season Performance Factor) : For heat pumps, a higher HSPF indicates superior energy efficiency in heating mode. By focusing on these ratings, you can select an AC unit that not only cools your space effectively but also contributes to reduced energy expenses. Additionally, understanding the importance of regular home AC repair can ensure your unit continues to operate at peak efficiency. For more guidance and options, consider reaching out to Inland Empire Comfort. Installation and Maintenance Considerations Understanding energy efficiency ratings is just the beginning; the installation and maintenance of your new AC unit play a significant role in its overall performance and longevity. Proper installation guarantees that your system operates efficiently, minimizing energy costs and enhancing cooling comfort. That's why hiring professionals is a smart choice. They'll ensure your unit is installed correctly, avoiding common pitfalls that can lead to costly repairs. Once your unit is in place, regular maintenance is essential. Schedule annual check-ups to clean filters, check refrigerant levels, and inspect the system for wear and tear. Regular maintenance can help reduce repair costs and enhance the longevity of your unit. This proactive approach not only extends your unit's lifespan but also keeps it running at peak efficiency. It's important to monitor your unit's performance; if you notice any unusual sounds or reduced cooling, it's time to seek expert help. Taking these steps will keep your home cool and comfortable for years to come. Budgeting for Your New AC Unit Budgeting for a new AC unit can feel overwhelming, but it doesn't have to be. By breaking down the costs and planning ahead, you can guarantee you get the best value for your investment with Inland Empire Comfort. Start by considering all expenses associated with your new system, not just the unit's price. Here are some key budgeting tips: Research your options : Compare different brands and models available through Inland Empire Comfort to find one that fits your needs and budget. Factor in installation costs : Obtain quotes from professionals at Inland Empire Comfort for installation to avoid surprises. Consider long-term savings : Energy-efficient units may have a higher upfront cost, but they save you money on energy bills over time, so look into options offered by Inland Empire Comfort. Plan for maintenance : Set aside funds for routine maintenance services provided by Inland Empire Comfort to keep your AC running efficiently.
