Why Heat Pump Runs Constantly in Summer and What to Do?

Figure 1: Heat pump unit.

Heat pumps are an excellent way to keep your home comfortable throughout the year. They are energy-efficient and can provide both heating and cooling to your home.

However, if you notice that your heat pump runs constantly in the summer, it could be a sign of a problem. In this article, we will discuss the possible reasons why your heat pump is running constantly in the summer and what you can do to fix it.

1. What is a Heat Pump?

Before we dive into the possible reasons why your heat pump is running constantly in the summer, let's briefly discuss what a heat pump is. A heat pump is a system that transfers heat from one place to another. In winter, it takes heat from the outside air and transfers it inside your home to keep it warm. In summer, it takes heat from inside your home and transfers it outside to keep it cool.

A heat pump system usually consists of a compressor, evaporator, condenser, expansion valve, reversing valve, etc.

Figure 2: Heat pump unit components.

2. Reasons Why Your Heat Pump Runs Constantly in the Summer

2.1 Incorrect Thermostat Settings

Your thermostat settings can also cause your heat pump to run constantly in summer. If your thermostat is set too low, your heat pump will work harder to maintain that temperature, resulting in it running constantly. Make sure your thermostat is set to a reasonable temperature, such as 78°F, which is comfortable for most people.

2.2 Dirty Air Filter

Another reason why your heat pump may run constantly in summer is due to dirty air filters. When air filters become clogged with dirt and debris, they restrict airflow, causing your heat pump to work harder to circulate air throughout your home. This can lead to higher energy bills and reduced efficiency.

2.3 Faulty Thermostat

A faulty thermostat can also cause your heat pump to run constantly in the summer. If the thermostat is not functioning properly, it may not be able to communicate with your heat pump to turn it off when the set temperature is reached.

Figure 3: Heat pump thermostat.

2.4 Refrigerant Leak

If your heat pump is low on refrigerant, it can cause it to run constantly in the summer. A refrigerant leak can occur due to a variety of reasons, such as a puncture in the refrigerant lines or an improperly installed system. If you suspect that your heat pump has a refrigerant leak, it's important to call a professional to repair it.

2.5 Undersized Sizing

One of the main reasons why your heat pump runs constantly in summer is due to incorrect sizing. If your heat pump is too small for your home, it will struggle to keep up with the cooling demand, resulting in it running constantly.
On the other hand, if your heat pump is too large for your home, it will cycle on and off frequently, which can also lead to higher energy bills.

2.6 Leaks in the Insulation

If your building has leaks in its insulation, the heat from the outside environment can easily seep into the indoor space. This forces the heat pump to work harder to maintain a cooler temperature, which can cause it to run constantly.

2.7 Blocked Outdoor Unit

The outdoor unit of a heat pump is responsible for expelling the heat that is collected from the indoor air. If the outdoor unit is blocked by debris, such as leaves or dirt, it can't do its job effectively. This can cause the heat pump to run constantly in an attempt to remove the excess heat.

Figure 4: Heat pump units.

2.8 Aging System

Over time, heat pumps can become less efficient due to wear and tear on the system's components. As the system ages, it may struggle to remove heat from the indoor air, which can cause it to run constantly.

3. How to Fix a Heat Pump That Runs Constantly in the Summer?

If you notice that your heat pump is running constantly in the summer, there are a few things that you can do to fix it.

3.1 Check the Thermostat Settings

The first thing you should do is check the thermostat settings. Make sure that the temperature is set appropriately for the summer. If it's set too low, adjust it to a higher temperature and see if that helps.

3.2 Replace the Air Filter

If the air filter is dirty, replace it with a new one. Air filters should be replaced every 1-3 months, depending on how often you use your heat pump.

Figure 5: Air filters.

3.3 Replace the Thermostat

If the thermostat is faulty, you'll need to have it replaced by a professional. A faulty thermostat can cause your heat pump to run constantly, which will increase your energy bills and put unnecessary wear and tear on your system.

3.4 Check Refrigerant Leak

If your heat pump is low on refrigerant due to a leak, it will struggle to cool your building and may run constantly. Here are some steps you can take:

● Contact a professional HVAC technician to diagnose and repair the refrigerant leak.
● Avoid adding more refrigerant to the system without first fixing the leak, as this will only result in more refrigerant leaking out and can damage the compressor.
● Once the leak has been repaired, the technician will recharge the system with the appropriate amount of refrigerant.

3.5 Consider Upgrading to a Larger Unit

If your heat pump is not the right size for your building, it may struggle to keep up with demand, causing it to run constantly. Here are some steps you can take:

● Contact a professional HVAC technician to evaluate your system and determine if it is the correct size for your building.
● If the heat pump is too small, consider upgrading to a larger unit that can meet your cooling needs.
● Work with the technician to ensure that the new heat pump is properly sized and installed for optimal efficiency and performance.

Figure 6: Heat pump air conditioning.

3.6 Check the Insulation

If you suspect that air leaks in your building's insulation are causing your heat pump to run constantly in the summer, you should take the following steps:

● Identify any areas where air may be leaking in or out of the building, such as around doors and windows, through cracks in the walls, or through gaps around pipes and other fixtures.
● Seal these leaks using weatherstripping, caulking, or other appropriate materials. You may also need to add insulation to areas that are poorly insulated.
● Consider getting a professional energy audit to identify any additional areas where air may be leaking in or out of the building.

3.7 Clear Outdoor Unit

If a blocked outdoor unit is causing your heat pump to run constantly, you should take these steps:

● Turn off power to the heat pump before cleaning the outdoor unit to avoid electrical shock.
● Remove any debris from the top and sides of the unit using a broom or brush.
● Use a garden hose to spray down the fins of the unit, being careful not to bend them.
● You may also use a commercial coil cleaner for tougher grime.
● Trim any vegetation around the outdoor unit to keep it clear of debris.

Figure 7: A heat pump unit on the lawn.

3.8 Aging System

If your heat pump is old and struggling to keep up with demand, it may be time to consider replacing the system. Here are some steps you can take:

● Contact a professional HVAC technician to evaluate your system and determine if it is indeed aging and in need of replacement.
● If replacement is recommended, work with the technician to choose a new heat pump that is appropriately sized for your building and meets your efficiency needs.
● Consider upgrading to a high-efficiency heat pump, which can save you money on energy costs in the long run.
● Schedule professional installation of the new heat pump to ensure proper installation and operation.

Should Heat Pump Run Constantly in Summer?

No, a heat pump should not run constantly in summer. Heat pumps are designed to both heat and cool your home, but they are meant to cycle on and off as needed to maintain a comfortable temperature.

If your heat pump is running constantly in the summer, it could be a sign that there is an issue with the unit or that it is not sized correctly for your home. It is important to have your heat pump inspected and serviced regularly to ensure it is functioning properly and efficiently.

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