A functioning heat pump is essential, especially now that the colder months are here. But like your conventional central air conditioning or ductless HVAC unit, it can suffer issues that may hinder its performance and longevity. One of the most common involves the unit getting iced-up. While it is a normal occurrence, it can be an indication of a bigger problem.
EZ Air Conditioning and Heating, the trusted HVAC contractor in and around San Antonio, TX, explains the causes behind a frozen heat pump, as well as tips on preventing it from happening this winter.
Unlike a typical furnace that burns fuel to provide heat, your heat pump uses a small amount of energy — mostly electricity — to do its job. The process in which it works is the same as that of air conditioners and refrigerators, but in reverse. The heat pump pulls warm air from the outdoors and transfers it indoors, creating warmth.
As the heat pump performs its function, some of the excess moisture from the air starts building up in the outdoor unit’s coils. Frost then appears as soon as the outdoor temperatures drop. Leaving it unaddressed causes layers of ice to appear, growing larger until the unit itself is covered with it.
Ice buildup on your heat pump’s outdoor unit is often a normal occurrence. This is especially true when temperatures drop significantly in the colder months. When this happens, the heat pump automatically goes in “defrost mode” so it continues to function as intended. This also prevents it from accumulating layers of ice further.
During this cycle, the heat pump starts working in reverse. Once it switches in this mode, the reversing valve starts sending hot refrigerant to the outdoor unit to thaw the frozen coils. The outdoor fan stops working and accelerates the increase in temperature within the coils. The defrost cycle varies depending on the ambient temperature and humidity conditions — it can last between 10 to 15 minutes, or until the coils reach a specific temperature. Once the unit is free of frost, the heating mechanism within the unit will stop, causing it to revert back to heating your home.
You can rest easy knowing that your heat pump is back to its normal operation after the defrost cycle kicks in. However, there can be times when the unit remains frozen. The top part of the outdoor unit and the inner coils are covered in ice. You may also notice that air isn’t being pulled into the unit’s fins. In any of these situations, it would be in your best interest to bring in an HVAC technician to give your heat pump a closer look. An iced-up heat pump could be a symptom of a much bigger issue that needs immediate attention.
The following are some of the potential reasons behind a frozen heat pump:
You can prevent your heat pump from freezing by following these tips from your duct cleaning and HVAC maintenance pros:
EZ Air Conditioning and Heating is familiar with all major makes and models of heat pumps. If yours is already showing signs of aging and deterioration, get in touch with our team of experienced technicians for an inspection. Count on us to deliver an affordable solution to get your comfort system back to proper working order in no time, be it implementing simple repairs to recommending a replacement.
Our heating and cooling experts also specialize in keeping your attic insulated and incorporating essential HVAC equipment into your home automation system. To learn more, give us a call at (210) 429-9186, or fill out our contact form to schedule a consultation.
The typical lifespan of a furnace ranges between 15 to 20 years. However, it is…
According to the EPA, the air in indoor spaces — homes, offices, public places like…
Heat pumps are efficient heating and cooling systems that can keep your home comfortable year-round.…
As the leaves change color and the temperatures drop, fall brings its own set of…
When it comes to maintaining your heating and air conditioning systems, timing can be everything.…
Winter is just a few months away, which means the hot and humid days are…