Why is my AC Unit Freezing up in Summer?

1. Dezember 2021 | Air Conditioner

Why is my ac unit freezing up in summer? This is something that happens more often than you think. But why is that, and how can you fix this problem? Before we ask ourselves this question, we must first look at how an air conditioning system works.

Air conditioners function by transferring hot air from your home or workplace to the outdoor unit. The system then pumps frigid air back. The air is cooled by passing it over a series of chilly pipes known as an evaporator coil inside the machine. This functions similarly to a refrigerator or when moisture vaporizes from the body.

The evaporation coil is loaded with refrigerant, which collects hot air and converts from liquid to a gas state. This is then pushed outside the building through yet another coil, in which it cools and restores to its liquid state. As a result, the condenser is the term given to the outer coil.

The condensers‘ motor consumes all of the power required to perform this task, and also the system typically produces 3 times the refrigeration energy consumed by the compressor. Due to the refrigerant changing condition from vapor, it allows for more power to be transported.

What are Filters?


Most central air conditioners contain a filtration system above the condenser coils that filters dust to help the equipment process clean air.

As it performs its function, the filter becomes progressively clogged with stray particles, limiting airflow. When filters are not replaced, the airflow would be reduced, becoming a novel cause of air pollution.

The easiest solution to cope with reduced air movement is to regularly replace your air conditioner’s filtration to keep it running efficiently.

How does my AC unit work?

Is your air conditioning system freezing up? Can anything exposed to air the whole day in the warmest months of the year be susceptible to chilling? Considering the irony of an air conditioning unit freezing up amid warm days, it is a common occurrence. Most of us lack the insights and knowledge of air conditioning units necessary to avert this issue on our own. This is an issue that can transform a pleasant afternoon into a scorching one in a matter of a few minutes.

Let’s take a peek at how your air conditioner works while we’re in the reasons of it frosting up. To begin, we must recognize that heat is a measure of a particle’s energy. Since the particles spin in the air contain a great deal of power and are flowing around quickly, the air feels heated. Cold air, on the other hand, is made mainly of reduced energy atoms. Whenever the air inside our air conditioning units isn’t pressurized, the temp decreases as it spreads and the particles slow. That’s what the Joule-Thomson Principle illustrates in physics. The atoms become agitated and warm up when compressed.

Why is my AC Unit Freezing up in Summer?

The purpose of an AC unit is to chill the gas inside the cooling coils so when it exits the ac unit, it begins to cool the temperature inside your house and efficiently eliminates the warm air. Nevertheless, if somewhere in the AC unit something fails, the entire system is thrown off. This leads the condenser coil to overcool the coolant, leading it to drop below zero and frosting.

So, how can we stop something in the cooling calculation from going horrendously wrong? Three major causes lead to an air condition frosting. By taking into account these reasons, we expect you to get ahead of your AC unit and never have a freezing problem, and whenever you do, you can solve it on your own. Maintaining the state of your air conditioning unit will allow it to run more effectively, sparing you cash on your electricity bill and preventing things from getting ugly.

Blocked Air:

Air conditioning units require a steady airflow to prevent humidity from condensing upon the coolant coils and freezing. Make sure your filters are not at all dusty or congested to maintain the flow of air in your home flowing sufficiently to avoid disrupting the operation of your air conditioning unit and the lack of airflow. The air movement in your home will be restricted as a result of this. Filters are inexpensive, and it’s recommended to replace them regularly. It’s also a great way to keep your air conditioner clean and set up to avoid airflow issues and other issues in general.

Mechanical Problems:

Machines in air conditioning units can become trapped, damaged, or blocked. The coolant lines may twist, the coils become dirty, the compressors no longer run, the filtering becomes jammed, resulting in a leak or excess moisture. Any one of these factors results in a loss in pressure, causing the coolant to expand excessively and become overly cold. Liquid coolant is also required to maintain a constant temperature across your unit. Freezing is also found to occur when the refrigerant levels get too low. Most of these issues are more straightforward and cost-effective to resolve than the others. With the instance of a leaky radiator, any repair will most likely only be superficial. It might be time to take a look into purchasing new equipment.

Cold Summer Nights/ Cold Outdoor Temperatures:

HVAC systems are programmed to function within a range of ideal temperature ranges. This can put an air conditioner out of sync when warm days are cooler than the optimal limit can compensate for. This could, for example, cause frozen coils.

How to Fix AC unit Freezing up in Summer?

Fixing Problems with Air Conditioner

Begin by totally shutting off the machine at the control. Do not try to defrost the device by raising the control temperature. This could possibly just cause the evaporator coil to break. Ensure sure the AC is switched off fully. Examine the current air filters and, if necessary, change them.

Additionally, verify that no furniture, curtains, or other obstructions are blocking any of the registers. Also, check to see if you have dirty coils. Contact a competent service technician if there is indeed a coolant leakage. To examine your system for corrosion and leakage, schedule a service request with a technician. Any major issue and a slew of minor issues might be to blame.

Your air conditioner is already broken, and you noticed a dirty filter. It’s most probably a problem with obstructed circulation. The very first step is to switch off the ac unit and allow it to thaw. Turn on simply the blower fan for around 1 hour once it has had enough time to defrost (2-3 hours). It is a good time to replace your exhaust system afterward when your air conditioner should be in working order again.

A quick guide to a frozen AC does not include mechanical issues or leak remedies. It’s better to deal with these troubles with the assistance of a knowledgeable specialist who is familiar with refrigeration systems. Though coolants are harmless to be used in the house, they should be managed by a specialist who understands how to confine them. Consult an Ac firm and have a technician look at the situation if you believe mechanical fault or leaks are the reason for a faulty air conditioner. Regular inspection by an air conditioning specialist can help prevent catastrophic complications with your air conditioner.

If you have a programmed thermostat, you can get forward of the issue by turning off the air conditioning when the temperature drops below 60 °. Keep a check on the present temps each evening to see if it’ll be below 60 °. In that scenario, switch off the air conditioning and open the curtains to allow the slightly cooler breeze in.

Other Common AC Problems

Because air conditioning unit repairs may be pricey, it’s critical to arrange routine maintenance with qualified AC experts to get the maximum efficiency from your air conditioner. Also, it’s essential to understand the significant air conditioner issues so you can prevent costly repairs.

AC Not Turning ON:

If your AC unit isn’t working or switching on, you must check your batteries in the controller. If the cells are gone, change those. Check the temperature controls to see if the conditioning mode is in sync with the selected temperature controls if the cells are in good operating condition. Examine the fuse box if the batteries are OK, but your AC isn’t working. Your air conditioner will not turn on if the circuit breaker has been tripped. By turning the switch on and off again, the fuse box can be reset.

No Chilly Air:

If your AC airflow is clogged with a dirty air filter, the cold airflow will be obstructed. A blocked air purifier can cause the condensing unit to freeze even more, decreasing the capacity of your air conditioner unit. Cleaning your dirty air filters monthly will keep the conditioner’s ability to blast cold air intact.

Making Noise:

An air conditioning system might emit a range of sounds related to several varieties of faults. There are several causes why your air conditioning unit is making strange noises:

  • A coolant leakage could produce a whistling sound. Make sure to check the level of refrigerant.
  • If you notice click-click noises when turning off or on your air conditioner, it could be a circuit relay issue.
  • Noises like thudding, grinding, or pounding indicate problems with the compressor and motor unit.
  • Faulty electrical parts cause a droning sound.

Leaking Water/ Refrigerant Leak:

It’s usual for the water to flow outside from an air conditioner on a hot and humid summer day, particularly while the machine is running. This is also usual if the water leaks outside in cold weather, once the temp is below 60°, because the unit might condense and lose water whenever it warms.

Sensor Issues:

A temperature sensor is situated near the cooling coils of the ac unit. The controller monitors the temperature of the inside air and the condensing coil and regulates the cooling to match the house’s temperature unless the gauge is pushed out of place. The ac unit may turn off and on at random cycles continuously. The sensors and the cooling coils should be close together but not touching. Twist the cable that keeps the sensors in place to adjust it.

Things to Never Do to Your AC Unit

Air Conditioner Installation

Here’s a good rule to keep in mind when using an air conditioning unit. It’s advisable to stop doing what you don’t feel like you should be doing. Anything further than changing an air filter is an incursion into a place that requires specialized knowledge.

Do not Patch Coolant Leaks:

Consider the case when your air conditioning system is whistling or gushing. This typically means there’s a coolant leak someplace in your air conditioner. You’re incorrect if you believe you can fix this with the aid of a few handy DIY tips online. Coolant may be damaging to your vision, face, lips, and body. Only qualified specialists with the appropriate gear can manage it.

Working with coolant is dangerous for unskilled persons, and you’ll almost certainly do more harm in the long run. You can’t simply cover the coolant line on an ac unit with duct tape and consider it a job well done. Such jobs need specific equipment and a skilled eye to ensure that everything has been done correctly. 

Do not Open the AC Unit:

If you have considered opening up your AC unit to perform a specific repair, There’s no way you should do it. A thousand tell-tale signs appear the instant you place your hands into your air conditioning unit. Do not try to do tasks like thawing frozen coils yourself.

To begin with, you may be nullifying your system’s warranties by attempting to fix it on your own. Second, discovering the issue and resolving this with the proper tools is a sensitive approach. If you handle anything or push a part that you shouldn’t, you risk causing costly harm to the unit, possibly even damaging it. Do not even take this chance when there are specialists that are experts in this.

The Bottom Line

A clogged air filter is by far the most significant cause of a freezing Air conditioning system. An air filter purifies the air that enters your house. It collects dust, debris, and other pollutants when your air conditioner operates during the summer. Experts recommend that you maintain your filters at least once a month.

While it might be aggravating to discover an iced ac unit as a resident, the issues causing it are avoidable. It’s critical not to overlook your annual maintenance and services.

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