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Why Your AC Unit is Frozen Inside

Why Your AC Unit is Frozen Inside

Why Your AC Unit is Frozen Inside

There are few things more frustrating than turning on your AC unit only to find out it’s frozen inside. Suddenly, the temperature inside your home becomes unbearably hot. Whether you live in a warm climate or the middle of winter, it’s important to know why your AC unit is frozen inside.

What Causes AC Units to Freeze Up

When your AC unit is frozen, it means the condensation process has failed to take place. AC units cycle warm air through the air conditioning filter, absorb the heat, and expel cold air. As moisture accumulates and the air filters become full of warm air, the unit itself can become a breeding ground for ice and frost.

The primary culprit of an AC that freezes up is a clogged air filter. In order to get the maximum cooling power out of your unit, it is important to regularly replace or clean your air filter. A clogged air filter makes it difficult for the unit to breath, and it can also cause a buildup of moisture in the unit, leading to frozen coils.

It is also important to make sure the outside grille of your AC unit is not obstructed by debris. A dirty, clogged filter can prevent air from flowing properly, and can cause a buildup of moisture which results in the coils freezing over.

How to Stop Your AC Unit from Freezing Up

Fortunately, there are a few simple steps that you can take to stop your AC unit from freezing up.

First, make sure that your air filters are cleaned or replaced regularly. This will help ensure the condensation process is running smoothly and that the warm air is being removed from the AC unit.

Next, make sure the outside grille of your AC unit is free from dirt and debris. This will help ensure that the flow of air is not blocked and that warm air is being expelled properly.

Finally, check the refrigerant levels in your AC unit. If the refrigerant levels are too low, this can cause your AC unit to freeze up. Low levels of refrigerant will cause the AC unit to become overworked and not be able to adequately remove the warm air from the system.


When your AC unit is frozen inside, there are a few different steps you can take to try and resolve the issue. Start by ensuring that you clean or replace your air filters regularly, make sure the outside grille of your AC unit is free from dirt and debris, and check the refrigerant levels in your AC unit. If these steps do not resolve the problem, it is recommended that you seek professional help from a reliable appliance repair company such as Local Reliable Appliance Repair at (866) 311-8590. Ignoring the issue can lead to further damage and higher repair bills, so it is important to take the necessary steps to ensure your AC unit remains in working condition.

Why Your AC Unit is Frozen Inside
Why Your AC Unit is Frozen Inside
Why Your AC Unit is Frozen Inside

AC Frozen Inside: What Are Manufacturer, Local Company, and HVAC Technician Recommendations?

As homeowners investing in an air conditioner, we all want our AC to function optimally. One of the most common issues that can occur is when your AC freezes inside. To help prevent this issue from occurring, here are some recommended steps from manufacturers, local appliance companies, and HVAC technicians.

Before making any changes to your air conditioner, it is important to take the time to consult with a professional. Doing this will ensure that any repairs are done properly and can help you avoid costly future repairs.

Manufacturer Recommendations

Manufacturers provide specific instructions regarding the use and maintenance of their air conditioners. Since the specifics will depend on the model, it is important to refer to the owner’s manual provided when the AC was purchased. Generally speaking, manufacturer instructions include:

  • Providing proper ventilation for the unit
  • Regularly changing or cleaning the filters
  • Installing or replacing insulation on air ducts
  • Ensuring the system is the proper size for the area being cooled
  • Regularly replacing parts such as fans, filters, coils, and motors

Local Appliance Companies

Most local appliance companies may have specific advice based on the type of air conditioner and climate of the area you live in. Items to consider include:

  • Ensuring outside condensate pipes are clear of debris
  • Installing a condensate overflow shutoff switch
  • Inspecting the area around the outside unit to ensure it’s free of debris or vegetation
  • Keeping the outside coil clean by regularly washing it off
  • Looking for signs of wear, tear, or corrosion on components

HVAC Technician Recommendations

HVAC technicians may also provide additional advice for preventing your AC from freezing inside. These include taking the following steps on a regular basis:

  • Checking the refrigerant level
  • Ensuring the unit is level
  • Inspecting components to ensure they are working properly
  • Cleaning the evaporator coil
  • Inspecting for duct leakage
  • Ensuring the condensate drain isn’t blocked


Taking the time to adhere to manufacturer, local appliance company, and HVAC technician recommendations can help avoid an AC Frozen Inside issue. If you suspect there is a problem, it is best to contact a professional to avoid any damage or costly repairs in the future.

Repair Cost for “AC Frozen Inside” Issue

Frozen coils in an AC unit will require a major repair. The average repair cost, given a 20% increase due to inflation, is around $800-$1,000, assuming the location is in California.

The parts required for a repair could include:

  • Refrigerant – estimated cost of $200
  • Heat exchanger – estimated cost of $300
  • Blower motor – estimated cost of $250
  • Expansion valve/orifice tube – estimated cost of $150
  • Fan blade/fan motor assembly – estimated cost of $50
  • Duct or cooling system cleaning services – estimated cost of $100

These are estimates for the parts and services involved in a repair. The cost of materials will depend on the make and model of the AC unit, the amount of parts needed, and the labor hours required. It is best to get an estimate from a reliable, local contractor as the cost of repair can vary greatly.

For reliable and experienced air conditioning maintenance, installation and service, call Local Reliable Air Conditioning & Heating at (866) 311-8590.

Beating the Heat with Reliable Air Conditioning & Heating: AC Frozen Inside

When the inside of your air conditioning unit becomes frozen and its performance wanes, what recourse do you have? Look no further than California’s own Reliable Air Conditioning & Heating.

This family-owned business has access to the most knowledgeable technicians, who come prepared with a minimum of five years of expertise. Deal with AC Frozen Inside quickly, safely, and cost-effectively with the help of Reliable.

Same-day service options are available and affordable pricing is guaranteed. Plus, you can trust that the company is licensed and insured. Never take chances with your air conditioning unit again. Let Reliable Air Conditioning & Heating efficiently assess and repair your air conditioner with precision.

And just so you can rest easy, a 90-day warranty is included on every repair. At Reliable Air Conditioning & Heating, you’re fully covered and can expect reliable, high-quality services. Beat the heat this summer with help from the professionals at Reliable.

FAQ: Why Is My AC Unit Frozen Inside?

What Causes an AC Unit to Freeze?

There are several issues that can cause an AC unit to freeze, including low refrigerant levels, a clogged air filter, blocked airflow, and/or outdoor temperature that’s too low.

How Do I Know if My AC Unit is Frozen?

If your AC unit is frozen, the evaporator coil may be covered with a thick layer of frost or ice. In addition, the air coming out of your air conditioner may be significantly reduced, and your home may become uncomfortably warm.

What Should I Do to Fix a Frozen AC Unit?

The first step is to turn off your AC unit. Then check to see if the air filter is blocked, if the airflow is blocked, or if the outdoor temperature is too low. If any of these are the source of the problem, you should take the appropriate action to rectify it. In addition, if the problem is low refrigerant levels, you’ll need to contact a certified HVAC technician to check the unit’s refrigerant levels and recharge the system if necessary.

What’s the Best Way to Prevent an AC Unit from Freezing?

The best way to prevent an AC unit from freezing is to replace the air filter regularly, make sure the outdoor temperature isn’t too low, keep airflow unrestricted, and make sure the refrigerant levels are correct.

If you’re having difficulty solving an issue with your AC unit that’s causing it to freeze, contact a Local Reliable Appliance Repair (866) 311-8590 for more advice and assistance.

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