Why Is My Brand New AC Unit Freezing Up?

Why is my brand new AC unit freezing up - Merchant logo Momentum AC Tampa

what do you do when that relief transforms into a chilling problem? If you’re asking yourself, ‘Why is my brand new AC unit freezing up?’ you’re not alone. This sudden icy predicament can turn your comfortable abode into an unwelcome frost zone. This article dives into the common causes and solutions to prevent your sanctuary from turning into a freezer.

Understanding the Basics of AC Operations

Before we can troubleshoot, it’s essential to understand the basics. At its core, your air conditioner works by passing warm indoor air over cold evaporator coils filled with refrigerant. This process not only cools the air but also removes moisture, contributing to overall comfort.

Common Reasons Why is Your brand new AC unit freezing up

Several culprits could be behind your AC’s Arctic antics. Insufficient airflow, refrigerant issues, and mechanical failures top the list. Let’s explore each in detail.

Investigating the Causes of AC Freezing

Insufficient Airflow

Dirty Air Filters:

A clogged filter restricts airflow, causing the temperature of the coils to drop too much and freeze. A simple fix? Check and change your filters regularly.

Blocked or Closed Air Vents:

Furniture or drapes blocking the vents can also lead to a freeze-up. Keep pathways clear for air to circulate correctly.

Refrigerant Issues

Low Refrigerant Levels:

Low refrigerant reduces pressure in the AC system, leading to freezing. Recharging your refrigerant can solve the issue.

Refrigerant Leaks:

If the refrigerant is leaking, it’s a more severe problem that requires professional help to fix and recharge the system.

Mechanical Failures

Blower Fan Problems:

The blower fan helps circulate air over the evaporator coils. If it’s malfunctioning, that necessary airflow is disrupted, leading to freeze-ups.

Faulty Thermostat:

A thermostat that isn’t working correctly may not regulate the AC’s cycles properly, which can cause continuous running and eventually freezing.

External Factors Contributing to AC Freezing

Outdoor Temperature:

Running your AC when it’s too cool outside (typically below 60 degrees Fahrenheit) can cause the coils to freeze.

Humidity Levels:

High humidity levels can lead to excess moisture on the coils, which can freeze during operation.

Diagnosing Your AC Unit

Professional Diagnosis:

A trained HVAC technician can diagnose the problem accurately and recommend solutions to prevent future freeze-ups.

DIY Inspection Tips:

If you’re comfortable with basic troubleshooting, you can inspect the filters, check for blockages, and ensure the thermostat is functioning correctly.

Preventative Measures to Avoid AC Freezing

Regular Maintenance:

Annual servicing by a professional can keep your unit in top shape and prevent many issues that lead to freezing.

Smart Usage Practices:

Avoid setting the thermostat too low, and make sure to turn off the AC when temperatures are excellent outside.

When to Call a Professional

Recognizing the Signs of Serious Trouble:

If simple troubleshooting doesn’t solve the problem, or if you spot ice on the refrigerant lines outside, it’s time to call a pro.

The Benefits of Professional HVAC Services:

A certified HVAC expert will meticulously calibrate your system with the precise quantity of refrigerant necessary for optimal performance, while also conducting a thorough assessment to confirm the integrity and functionality of each individual component.


No one wants their comfort zone turned into a walk-in freezer. By understanding the potential causes of an AC freeze-up and taking proactive steps to prevent them, you can ensure that your air conditioner remains a reliable escape from the heat. Keep an eye on your AC’s performance, and don’t hesitate to seek professional help when needed.

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Momentum AC Services Inc is a family-owned HVAC company in the Tampa area. We offer fast installation of all major brands of air conditioning units with no hidden costs or surprises. Momentum AC will work hard to make sure your new unit is installed on time and that it runs smoothly for years to come. 

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