Over time, it clogs with dirt, pollen, dust, and other allergens. This restricts the airflow and the HVAC coils freeze. Typically, we recommend you check your filter monthly. Change it as needed. For most folks, this is one to every three months.
Filter changes vary based on factors, such as:. As part of a seasonal tune up, a professional HVAC contractor performs a comprehensive inspection. This includes checking coolant levels and charging if necessary. Think you might have a coolant leak? There are a couple of signs. For example, does your AC blow hot air? Do you hear a hissing? Avoid handling coolant chemicals, because they can be toxic. Leave it to the professionals if possible.
Obstructed airflow is a major reason heating and cooling systems malfunction or function inefficiently. Similar to a clogged filter, blocked vent returns and registers prevent adequate airflow. This causes your system to work harder without a way to release the cooled or heated air. Are vents and registers clear from any obstructions? Your problem may be poorly designed or installed ductwork.
In some cases, the ductwork is installed well but the wrong size for your house or the capacity. Our trained professionals inspect your ductwork and offer redesign solutions, if necessary. It then returns to the outdoors, where the condenser condenses those same molecules, causing the line to heat and expel that heat energy into the outdoor air. This happens over-and-over again until sufficient heat energy is removed from your home to bring it down to the temperature where things are comfortable.
In the event that heat energy is not able to be absorbed into the refrigerant, things start to go wrong. Most often, this occurs because the return air—the heat energy-filled air inside of your home—is unable to get to the line. As a result, the refrigerant in the line begins to get colder with no heat to absorb.
The line gets cold enough that the condensation on the outside of the line—which normally drains away harmlessly—freezes over, leading to a literal block of ice.
Essentially, anything that blocks airflow to the evaporator coil can lead to a frozen evaporator coil. Here are some of the most likely culprits:. This prevents it from getting the airflow it needs to properly move heat, which means that the system could then freeze over. Evaporator coil cleaning is an essential part of our AC tune-up service for this exact reason. Typically, we recommend you check your filter monthly. Change it as needed.
For most folks, this is one to every three months. Filter changes vary based on factors, such as:. It is just good practice to have an annual air conditioning maintenance service call. Leave it to our technicians and keep yourself away from handling them if possible.
Obstructed airflow can keep the coils from properly cooling and lead to a frozen AC unit. Similar to a clogged filter, blocked vent returns and registers prevent adequate airflow to and from the system. This causes your system to work harder without a way to release the cooled or heated air. Another good practice is to walk around your home and check that indoor air vents and registers are clear from any obstructions.
In some cases, the ductwork is installed well but the wrong size for your house or the capacity. The condensate lines drain excess moisture from your HVAC system. And that frozen water in your lines could leave you with frozen HVAC coils too.
This causes your system to struggle or not work at all. Are summer temperatures expected to drop at night? A good rule to remember is when the outdoor air temperatures dip, you should turn your air conditioner off. A special ambient temperature control installed can help prevent your unit from running in cooler weather. While it can be frustrating to find a frozen AC system as a homeowner, the problems that cause this are preventable.
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