A short spoken explanation about why residential HVAC systems can freeze during cooling season. The speaker identifies restricted airflow—commonly from dirty or clogged filters—and low refrigerant as primary causes, describes observable signs (frozen evaporator coil and a frozen refrigerant line at the outdoor unit), and advises checking/cleaning the filter and having the system inspected when freezing occurs.
The main cause is usually airflow. So you need to check your filter to make sure that it's clean, it's been replaced, it's not stopped up. That way, air cannot get through. If airflow is restricted in any way, it's going to cause that to freeze over. You'll see kind of like what happens in your freezer when you have too much ice going on there, right? You see that frozen over coil. Same thing happens with your unit. Also, things could be happening, especially when you go into cooling season, that you'll notice is it's low on refrigerant. But if you're low on refrigerant, it will also tend to freeze over. And you'll start seeing that at the outdoor unit. That little line that goes from the outdoor under your house or in the attic, you start seeing that freeze over. That's the indication that you're having that kind of challenge as well. So a couple things going on. Could be airflow, it could be refrigerant. Either way, it's not normal and it should be checked out.
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