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It’s then converted back to a liquid, and pumped toward the blower motor in the house. The refrigerant heats up, and drops the pressure in the system. The war air converts the refrigerant into a gas. Essentially, the compressor in your air conditioner compresses refrigerant after the heat from inside is released. Lack of refrigerant in the system can cause big issues. The accumulated dust can act as an insulator on the coil, preventing the warm air from reaching it. If you happen to run your unit without a filter, a low-quality filter, or a dirty filter, it’s possible that dust can accumulate on the coils. A clogged filter restricts air flowing into the unit, and can lead to the unit freezing up. If you have forgotten about this, it’s quite possible the filter is clogged. It’s easy to forget that there’s a filter blocking the dusty air in your home from entering the air conditioner, keeping the air and the unit clean. This, of course, can lead to the coils freezing up.
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If there isn’t enough voltage coming through, it could impact either the blower motor or the fan, leading to a lack of air flow over the coils. This is because the unit runs on a number of high-power components to keep your home cool. In case you haven’t noticed, your electric bill usually goes up over the summer, when your air conditioner is being used more. A failing blower motor may sound inconsistent while it works, or may even rattle. If it breaks, or there’s an issue with it, the air flow over the coils could be disrupted, leading to ice buildup. The blower motor does just what it sounds like: It blows warm air over the coils. Even if everything else in the system is running well, a reduction or issue with air flow can lead to freezing of the unit. Blocked Air DuctĪir moves through ducts in your home, so it goes without saying that any issue with an air duct, such as a collapse or blockage, can wreak havoc on your air conditioning system. Whatever the exact issue is, as soon as warm air stops flowing over the coils, freezing and ice-accumulation can start. This can be caused by a range of issues, from malfunctions in the blower motor to problems with the air intake. This is the most common reason an air conditioner freezes up. Now, let’s take a look at some of the reasons a unit freezes up in the first place. The ice can actually start moving up the copper pipes of the unit, all the way to the compressor. That’s because the more moisture that comes in contact with the accumulating ice, the more ice builds up on the coils. Let’s take a look.įirst, it’s worth mentioning that high humidity can make the freezing issue worse. If the warm air stops blowing over the coils, or if the pressure is off in any way, the coils can become too cold, and become frozen. The coils in an air conditioner use pressure to manipulate the airflow, which keeps the air blowing over the refrigerant coils. That’s because the system is pulling the air from the inside, and discharging the extra heat outside. If you’ve ever felt the air blowing out of an air conditioning unit outside, it probably felt warmer than the outside temperature. For instance, with an outdoor, straight cooling system, warm air from the inside is removed by an indoor coil, and transferred to an outdoor coil, where it is pushed out. The warm air also serves to keep the coils from freezing over.
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To understand how this can happen, it’s important to understand how air conditioning works in the first place.Īn air conditioner contains a coil of cold refrigerant, which needs warm air to blow across it in order to produce cold air. A frozen air conditioner won’t blow cool air, and may not blow any air at all. When there’s an issue with any of those components, the refrigeration system in an air conditioner, which creates the cool air, can actually freeze itself. Air conditioners work through a system of controlling temperature, airflow, and pressure. However, when an air conditioner freezes up, that’s a bad thing. Ice-cold, freezing air conditioning is usually a good thing, especially during the hot summer months.