How Often Should a Heat Pump Cycle On & Off (Tips & Guide)

Josh Mitchell

Written By

Josh Mitchell

Expert Reviewed By

Holly Curell

Last Updated On

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Key Takeaways

  • A heat pump typically cycles on and off every 10-15 mins. However, its frequency depends upon the ambient weather conditions and thermostat settings.
  • Short cycling is when a heat pump rapidly turns on and off. This indicates and underlying issue.
  • To avoid short cycling, make sure your unit is properly sized, it is regularly cleaned, and that it is often checked by an HVAC professional.

Winter is coming, and it's not just a Game of Thrones reference; it's a reality I face with a mix of dread and preparation.

As someone who's not a fan of the cold, I've always looked for efficient ways to keep my home cozy during the chilly season.

This led me to look into the world of heat pumps and their cycles.

Understanding how these cycles work is the key to unlocking a warm haven as the temperatures outside start to drop.

What Exactly Is a Heat Pump's Heating Cycle?

A heat pump's heating cycle is a process where the system extracts heat from the outside air, even in cold weather, and transfers it inside to warm your home.

This operation involves reversing the heat transfer process typically used for cooling.

The heat pump cycle efficiently moves heat rather than generating it, making it a key component of the heat pump system's operation.[1]

How Does the Cooling Cycle Work?

The cooling cycle of a heat pump works by reversing the heating process.

In this mode, the heat pump extracts heat from inside the home and expels it outdoors, effectively cooling the interior space.

When my heat pump turns to cooling mode, I often notice a subtle shift in the sound it makes, a gentle buzz that signifies the start of the cycle.

The outdoor unit plays a crucial role in releasing the absorbed indoor heat, thus maintaining a comfortable, cool environment inside, especially during those warmer months.

How Does the Heating Cycle Work?

The heating cycle of a heat pump works by reversing its cooling function.

Instead of removing heat from the indoors, it extracts heat from the outside air and brings it inside.

Even in cold weather, there's enough ambient heat outdoors for the pump cycle to warm the house effectively.

Useful tip:

The transition from cooling to heating is often marked by a noticeable change in the unit's hum, just like the cooling cycle.

It's fascinating how the same device can alternate between heating and cooling, providing year-round comfort with just a switch in the pump cycle.

TL;DR: Depending upon the direction of the heat transfer, a heat pump can cool or heat. Heating cycle is when it extracts heat from the air and transfers it indoor.


Frequency of Heat Pump Cycles Explained

Navigating the cycling of a heat pump can feel like a delicate balancing act, especially when considering the efficiency and costs involved.

From my own experience with a heat pump in my house, I've noticed that the cycles can vary significantly based on the season and the thermostat settings.

So, how often should a heat pump cycle on and off?

During winter, when the chill sets in, my heat pump tends to cycle more frequently.

It works harder to maintain a warm and comfortable temperature inside, especially when the outside temperature drops significantly.

On average, each cycle lasts around 10 to 15 minutes, a duration I've found to be quite common.

On the flip side, in the summer, the cycles might be longer but less frequent as the unit efficiently cools the house.

TL;DR: The ambient temperature and the thermostat settings play a crucial role in how often the heat pump cycles on and off.

Heat Pump System Efficiency

The key to optimal performance and energy efficiency lies in the frequency of these cycles.

While it's normal for the unit to run more often during extreme weather, continuous cycling or very short cycles can indicate inefficiency.

This might lead to higher energy bills and strain the compressor, reducing the system's overall lifespan.[2]

The efficiency of heat pumps varies based on several factors, including the unit's size relative to the house, insulation quality, and even the location of the thermostat.

For instance, if the thermostat is exposed to direct sunlight, it might cause the heat pump to cycle more often than necessary.

To ensure your heat pump operates efficiently, it's crucial to have it sized and installed correctly by experienced technicians.

Regular maintenance, like cleaning vents and filters, also helps optimize airflow and performance.

An efficient cycling heat pump not only keeps energy costs down but also ensures your home remains comfortable, whether you’re braving the cold or beating the hot weather.

TL;DR: How often the pump cycles can impact your energy bills. Sizing the unit properly, regular maintenance, seasons and its installation can all impact this.


Signs Your Heat Pump is of Short Cycling

Short cycling is a common issue in heat pump operation, where the unit rapidly turns on and off, impacting efficiency and longevity.

Here are key signs of heat pump short cycles:

  • Frequent On and Off: 
    The most apparent sign of short cycling is when your heat pump kicks on and then off in quick succession.
  • Inability to Maintain Temperature: 
    If the heat pump struggles to keep the room at the set temperature and cycles frequently, it's likely short cycling.
  • Unusual Noises: 
    Hearing the heat pump turn on and then off repeatedly within a short time frame is a telltale sign.
  • Increased Energy Bills: 
    Short cycling often leads to higher electricity bills because short cycling will increase energy consumption.

TL;DR: Short cycling is when the unit quickly turns on an off. This is an issue that indicates and underlying issue to be resolved by an expert.


Is It Cycling Too Often? – Causes of Short Cycling

When my heat pump started acting up, cycling on and off more than usual, I knew something was off.

Short cycling can be a real headache, and pinpointing the causes is key to fixing the issue. 

Here are some common culprits I discovered:

Important tip:

Do not attempt to inspect or fix these issues unless you are an HVAC professional. Otherwise, you may end up harming yourself or damaging your unit even more.

  • Clogged Air Filters: 
    A dirty air filter or clogged air filter restricts airflow, forcing the heat pump to work harder and cycle more frequently. Regular cleaning or replacement is essential.[3]
  • Thermostat Malfunction: 
    Errors with the thermostat, including incorrect settings on a programmable thermostat, can lead to irregular cycling. Also, ensure that the thermostat is not near any vent or furnaces, as they can affect the temperature reading.
  • Refrigerant Leak: 
    When the refrigerant leaks, it disrupts the heat pump's ability to regulate temperatures efficiently, causing short cycles.
  • Unit Too Large for Space: 
    An undersized unit, due to improper calculations, can result in rapid cycling. It won’t be able to circulate the appropriate amount of heat or coolness. So, install a unit that is appropriately sized for the space for it to function optimally.

TL;DR: There are many causes to heat pump short cycling. Some are as simple as clogged filters others such as refrigerant leak will require professional help.

How Can You Prevent Your Heat Pump From Short Cycling

Dealing with a heat pump that has short cycles can be quite a headache. However, there are a few tricks I've picked up to prevent this common problem.

First, inverter technology is a complete game-changer, but how does inverter technology influence heat pumps' performance?

By allowing the system to run constantly but at varied speeds, thereby reducing wear and preventing short cycles.

Regular check-ins by experienced HVAC professionals are critical; they can immediately spot issues like leaking refrigerant, faulty wiring, a thermostat error, and other conditions.

Also, ensuring proper calculations of your space to HVAC systems' size are correct can prevent them from running continuously, reducing strain.

Trust me, installing your heat pump ideally, with the help of an experienced technician, and considering auxiliary heat options can make a world of difference in maintaining a comfortable home without the annoyance of frequent cycling.

TL;DR: Newer technologies, proper sizing and regular checks by HVAC professionals can help in preventing or fixing short cycling.


People Also Ask (FAQs)

What is a Defrost Cycle?

The defrost cycle in a heat pump is designed to prevent ice buildup on the outdoor unit.

It briefly reverses heating or cooling mode to melt ice, ensuring efficient operation. This cycle is particularly vital in cold weather to maintain the desired temperature.

How Long Should a Heat Pump Run Per Day?

Ideally, a heat pump should run for about 8-10 hours per day, depending on the outdoor temperatures and the desired indoor temperature.

With inverter technology, this can vary based on the system's efficiency and the heating or cooling needs of the home.

How Often Should a Heat Pump Cycle During Winter?

In winter, a heat pump may cycle more frequently, around 2-3 times per hour, to keep the home warm.

This frequency can vary depending on the outside temperature, the home's insulation, and the heat pump's efficiency.

Proper installation and use of aux heat can optimize these cycles.

References: 

  1. https://natural-resources.canada.ca/energy-efficiency/energy-star-canada/about/energy-star-announcements/publications/heating-and-cooling-heat-pump/6817
  2. https://assets.publishing.service.gov.uk/media/5a78e0d9e5274a2acd18a7c6/7389-effects-cycling-heat-pump-performance.pdf
  3. https://www.energystar.gov/products/ask-the-experts/how-to-keep-your-hvac-system-working-efficiently
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Josh Mitchell

Founder

Josh Mitchell
My name is Josh and I am obsessed with home appliances. From portable AC units to heaters and air purifiers, I enjoy testing, learning and using these devices to improve the air quality inside my family home.

My Favorite Home Appliance?

Midea U Shaped Window Air Conditioner

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