Snow and Ice Can Cause Damage to Your Heat Pump or AC Unit Blockage of the airflow from the outside compressor to the indoor coil can result in a water block, leading to freezing and, potentially, unit failure.
Safely De-ice Your Heat Pump: If ice forms, gently melt it with warm (not hot) water. Only do this when temperatures are above freezing to avoid exacerbating the issue.
But the makers of your heat pump knew this freezing would happen. That's why it was built with a defrost mode. Every 90 minutes or so, your heat pump should kick into defrost mode to melt the ice and keep your heat pump running efficiently. So a little bit of frost is fine.
As long as your house is properly air-sealed and insulated, an air-source heat pump can perform well beyond temperatures of -13 degrees Fahrenheit!
Clear dirt and debris away from the unit: Turn the unit off or leave it in emergency heat. Then clear away any dirt, debris, or leaves around the unit. This will help prevent ice and snow from building up and blocking airflow to the coils. Be careful not to damage the outside unit.
You should not cover your heat pump because it runs all year long. As long as it's running, it needs to be able to freely take in air along the sides and release exhaust out the top. Sometimes a storm causes snow or ice to accumulate on the heat pump. You should only remove the snow or ice from the top.
Turn the heat pump off at the circuit breaker. You don't want it to suddenly energize while you're working on the problem. Next, grab a garden hose and spray the heat pump with water until the ice melts. Hammering or chipping away the ice could cause major damage.
Most standard heat pumps will function at 100% efficiency until the outside temperature reaches about 40° F. However, when the temperature dips below this, most heat pumps are not able to maintain efficiency. They become much less effective at temperatures between 20° F to 30° F.
Examine your heat pump to see where ice has formed. Usually, ice will form around the coil but can also form inside the heat pump itself. Judging by the location of the ice, you'll be able to determine some causes of your heat pump freezing.
If you remove the service panel there is a circuit board. On that circuit board there will be a set of pins labeled forced defrost. By Placing A Jumper Across The Forced Defrost Terminals For 5 Seconds, Or Longer, And Then Removing The Jumper The Unit Will Initate A Defrost Cycle Regardless Of Coil Temperature.
Snow and ice can accumulate on your heat pump's outdoor compressor, triggering excessive airflow inside the unit. If this happens, the air pressure may exceed the system's maximum pressure limit, which could potentially cause the unit to fail.
There are some factors that contribute to how often air pumps switch to defrost mode. These include outdoor temperatures, humidity levels and the heat pump's efficiency. Conditions that allow frost to form trigger the defrost cycle, which can happen as often as every 35 minutes.
For this reason, heat pumps start to lose efficiency at around 40 degrees F and become less efficient than furnaces at around 25 degrees F. Heat pumps continue to be effective at cooling the indoors, even at high temperatures. In the South, it rarely gets below 25 degrees.
Run the Heat Pump's Fan
If your heat pump isn't operating properly, even after you've given it 3-4 hours to automatically defrost itself, then you could try unfreezing the system by turning on the fan setting (provided yours has one). Running the fan can help you thaw the heating system within an hour.
If you have the ability to wait, switch off the fan, and your unit can thaw on its own. Note that this will take at least a few hours. Run hot or even cool water from your garden hose over the unit to melt ice. Never try to chip away ice with anything sharp, as this could damage your equipment.
Interior Heating Element
In defrost mode, this heating element will automatically turn on, or the interior blower fan will turn off.
One method is to avoid using sharp objects to remove snow and ice. Keep a 2-foot space clear around the unit if possible. Install a heat pump cover from us: Choose a heat pump cover that is long-lasting, weather-resistant, and breathable. This will keep snow, ice, dirt, debris, and animals away from your unit.
First, you'll likely notice that the heat pump cannot generate enough heat output to keep your home comfortable. Ice can block airflow through the fins and outdoor coil, which can cause damage to the coil, refrigerant leaks, and other malfunctions. Ice can also damage outdoor fan blades within the unit.
Low refrigerant levels in a heat pump can lead to several tell-tale signs, including reduced heating or cooling efficiency, longer operation times to achieve desired temperatures, or even the system freezing up, leading to potential damage.
Air source heat pumps work efficiently in heating and cooling modes, making them a versatile choice for year-round comfort. Unlike boilers or furnaces, which cycle on and off to maintain a comfortable temperature, heat pumps can run continuously without wasting energy.
This heating method works incredibly efficiently until the outdoor temperature reaches about 35 degrees. At this point, the heat pump has difficulty extracting enough heat from outside to keep up with the thermostat setting. This is when many people assume it's time for switching their heat pump to emergency heat.
Too much ice built up on the heat pump can cause it to break down or even damage the system's internal parts. Call an HVAC Pro for more information if you think this might be the problem.
Ice and frost on your heat pump
To fix the problem, all you have to do is temporarily cut off the power supply and gently pour hot water into the unit to melt the accumulated ice.
Generally speaking, most heat pumps discharge air in an upward direction from the top of the unit. It is important to make sure that this area is clear of snow and ice to allow air to easily discharge (this is the air that is being drawn from the sides of the unit noted in item #1).