How To Protect HVAC From Freezing Up

How To Protect HVAC From Freezing Up

Winter is coming, and that means it’s time to batten down the hatches and prepare for an onslaught of freezing temperatures. But what about your HVAC system? Is it ready for the long winter months ahead?

The truth is that many people don’t know how to protect their heating and cooling units from freezing up, which can cause expensive damage. That’s why we’re here to tell you how to protect your HVAC from freezing up—so you can stay warm without worrying about whether your furnace or HVAC unit will be able to handle the cold.

If you’ve been looking for ways to protect your HVAC from freezing up, look no further! We’ve got all the answers right here!

How Does the HVAC Unit Work?

HVAC units are used to heat and cool buildings. The technology that makes this possible is called a heat pump, which uses an electrical current to move heat from one place to another.

They can be simple mechanical systems such as those found in many older buildings, or they can be complex computerized systems with multiple controllers, sensors, and other devices which automatically maintain indoor conditions within a controlled range.

It also consists of several components that work together to provide comfortable and conditioned air. Here are those:


The compressor uses electricity to compress refrigerant gas into liquid form. It then sends this liquid through tubing that runs through all four parts of the system.


The condenser removes heat from inside the building from the refrigerant gas. This heat then travels through coils that are located outside of your building.


The evaporator uses coolant gas to convert liquid refrigerant back into its gaseous state so that the compressor can use it again. Finally, this process causes cooling throughout your building by circulating cool air throughout its ducts for distribution throughout each room within your structure!

How to tell if HVAC is frozen? 

When the temperature of an object falls below 32 degrees Fahrenheit, it freezes, and this usually occurs when a liquid solidifies. In the case of your HVAC system, freezing occurs when water gets trapped inside something and changes shape from a liquid to a solid. This can cause damage to your heating or cooling system.

So how do you know if your HVAC is frozen? Let’s take a look at some signs that indicate something might be wrong with your unit:

Reduced airflow

You will notice a decrease in airflow and an increase in temperature if your HVAC unit is frozen. If left untreated, this might cause difficulties breathing, dizziness, and even death.

Ice or frost

Look for ice or frost on the coils and vents of your HVAC system. This is a clear sign that there is moisture in the air inside your home and that it has frozen onto the coils.

High energy bills

If your energy costs are unusually high, especially during the winter, it might be due to a frozen HVAC system, which indicates a problem with airflow in your home’s ductwork.

Strange noises

If you get strange noises from your HVAC when it’s running (such as rattling or clicking), this could be caused by ice build-up within the system, which must be addressed immediately!

Inadequate heating or cooling

If your HVAC system is frozen, it may be unable to keep your house warm in the winter or cool in the summer. This might cause issues with other systems in your home, such as pipes or appliances that don’t perform well in cold weather.

Water Leakage

If there is a water leak in your home, it could be an indication that the heating or cooling system is frozen. This happens when the water pressure in your home drops or if the hot water line becomes frozen.

Why air conditioner Freezing Up?

When it comes to your AC units, there are several things that can go wrong. The most common problem is the freezing of the air conditioning unit. This is especially true for older units, which may not have been designed with freezing in mind. But even newer models can be susceptible to freezing if they’re not well maintained and maintained properly.

Here are some reasons why an air conditioner might freeze up:

Restricted Airflow

The first reason your air conditioner may be freezing up is because of restricted airflow. When there is too much resistance in your system, it can cause your compressor to stop working properly and even fail completely. For this reason, it’s important that you do not place anything near your unit that could block its air intake or return vents. This includes plants, furniture, and even other appliances like humidifiers or space heaters.

Low Refrigerant Levels

Another reason that your air conditioner might freeze up is because of low refrigerant levels. This can happen if you don’t maintain proper maintenance on your system or if something has gone wrong with the refrigerant lines or valves. If this happens, the compressor won’t be able to run efficiently and will stop working properly, which will cause it to overheat and freeze up due to a lack of lubrication from oil that is used for cooling purposes inside your unit’s components (like bearings).

Thermostat Issues

If your thermostat isn’t set to the correct temperature, or if it’s broken, then your air conditioner may be running constantly and not cooling down the house.

Outdoor Temperature and Humidity

If it’s really cold outside, the humidity can get too high for your AC to handle. This is particularly true if you live in a place with lots of trees or plants around your house.

Dirty Evaporator Coil

Your evaporator coil is where the refrigerant moves out of your air conditioner and back into your home. This procedure creates a cooling effect for your home, but if it becomes covered in dirt or debris, it can force the unit to freeze up and stop working properly.

Mechanical Issues

If there’s something wrong with your air conditioner’s fan motor or compressor, it won’t be able to move enough air through the system to keep it cool enough for use in your home. This could result in a freezing-up problem as well as other issues like loud noises coming from the unit or problems starting up again after being turned off for a while (e.g., dirty condenser HVAC frozen coils).

Insufficient Maintenance

Your air conditioner needs regular maintenance and cleaning to keep it running smoothly. If your air conditioning unit hasn’t been serviced lately, it might be clogged with dust and debris that block airflow and reduce efficiency. A dirty filter also affects airflow and can cause an air conditioner to freeze up.

8 Tips to Winterize HVAC Systems

If you live in an area that gets cold in the winter, you know how vital it is to maintain your HVAC system and keep it running in a smooth manner so you can stay warm and comfortable. And if you don’t live in a cold area, then maybe you need to know how to winterize your HVAC system anyway!

Winterizing your HVAC system is a simple process that involves cleaning out the unit and making sure everything is ready for the cold months ahead. It can be done at any time during the year—even if it’s hot outside! Here are some tips to get started:

Clean or Replace Air Filters

Air filters are the first line of defense against dust and debris in your home’s air supply. If they haven’t been cleaned in a while, they could be clogged with allergens and irritants that can be damaging to your health—not to mention costing you money on energy bills. So make sure to check them regularly throughout the fall and winter months, and replace them if necessary!

Check and Seal Air Leaks

Air leaks can cause significant damage to your HVAC system by decreasing the efficiency of its components. They can also lead to higher energy bills because they create extra work for your system, which requires more power from its motor in order to push air through tight spaces in its ductwork. You should have any air leaks checked out by a professional HVAC service technician as soon as possible so they don’t become too serious before winter arrives!

Insulate Ductwork

Insulating ductwork can help reduce energy costs and improve air quality by preventing warm air escape. To insulate your ductwork, use a spray foam insulation that contains water vapor barrier material and a closed-cell spray foam insulation.

Programmable Thermostat Settings

Programmable thermostats can help you save money on energy bills because they allow you to set temperature thresholds when you’re home or away. You can purchase a programmable thermostat at any hardware store or online store like

Repair Frozen Suction Line

Wondering “how to troubleshoot an a/c frozen suction line?” The suction line is the pipe that runs from the condenser unit to the outdoor unit and transports refrigerant back and forth. It is important to keep this line free of ice and snow so that you can get a steady stream of cool air into your home. If you notice that the suction line is frozen, turn off your unit immediately and call a professional heating and AC service technician.

Clear Vents and Registers

If you’ve got vents in your home, be sure to check them for clogs or debris that could be preventing airflow through them. If there’s any snow built up on top of them, clear it away carefully so that it doesn’t fall into or onto other parts of your HVAC system when you remove it!

Protect Outdoor Unit

If your air conditioner or furnace is outside, make sure it’s protected from the elements. This means covering it up with a tarp or other material that will keep it dry and safe from snow and freezing rain. 

Monitor Humidity Levels

If you’re running a humidifier during winter, ensure your home is not too humid. Check the humidity levels in each room of the house so that you can adjust as needed throughout the season (and remember that humidity levels are often less than ideal when temperatures drop below 55 degrees Fahrenheit).


What happens if I run HVAC is frozen?

If you run your HVAC system when it’s frozen, it can damage your unit. Frozen air filters can lead to expensive repairs or even replacement units. If you’re unsure if your system has been damaged by a frozen filter, contact a professional to make sure everything is fine.

How long does it take frozen HVAC to defrost?

It depends on how much ice is on the system. It can take a few days or even a week or more to defrost if it’s a lot. On the other hand, if it’s just a little bit, it could take only a couple of hours.

How can I tell if HVAC coils are frozen?

One of the easiest ways to tell if your HVAC coils are frozen is by looking at them. If they are covered in ice or frost, they are likely frozen HVAC. If there is any water dripping from the coils, it will likely come from condensation that has formed when the air conditioner is running. It is normal for this condensation to drip from your HVAC system, but if there is an excessive amount of it dripping or if you see ice forming on the coils, then this indicates an issue with your unit, and you should contact a professional for assistance.

Sign Up for a Professional HVAC Service Agreement in Hockessin, Delaware!

Your HVAC system is a vital part of your home, and you want to make sure it’s always operating at its best. That’s why you should sign up for professional HVAC service in Hockessin, Delaware!

LIAM Services offers comprehensive services for businesses and homeowners alike. 

With LIAM Services, you can get the peace of mind that comes with knowing your HVAC system is always working its best. The professionals at LIAM Services are ready to provide you with comprehensive maintenance and repair services that will help maintain your AC unit and keep it running smoothly and efficiently. You’ll be able to rest easy knowing your system is up to date on all of its scheduled maintenance and any potential issues that could arise.

When you sign up for our HVAC Service Agreement in Hockessin, Delaware with us, you will get the following:

– 24/7 service support

– Discounts on parts and labor

– No overtime charges

– A 100% satisfaction guarantee

– A team of experts that have been servicing HVAC systems since 2008.

– Service plans that include regular maintenance checks and tune-ups, as well as emergency repairs.

– Complete HVAC Maintenance and Services in Stafford

Moreover, we offer a variety of contract options so that your HVAC system can be serviced regularly. Our service agreements include comprehensive maintenance services, including regular inspections and tune-ups. You’ll never have to wonder if your HVAC system is working properly again!

So what are you waiting for? Sign up today and get peace of mind that your HVAC unit is ready for whatever comes it’s way!

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