Ten Clear Signs It's Time to Replace Your Heat Pump

Geraldine C.
Aug 1
6 min read

Editor's Note: Updated Content Alert - This article was first published on August 13, 2024 and refreshed on August 1, 2025 to provide the most current and comprehensive information on heat pump replacement.

Heat pumps are the unsung heroes of a comfortable New Zealand home, providing efficient heating and cooling throughout the year. But like all hardworking appliances, they have a finite lifespan. Knowing when to replace your heat pump is crucial—it can save you from unexpected breakdowns, sky-high energy bills, and a frustratingly inconsistent home environment.

OneAir is 100% Kiwi-owned and operated business, and our certified technicians have installed, serviced, and repaired thousands of heat pumps across the North Island. We are proud to be authorized dealers for leading brands like Mitsubishi Electric, Daikin, and Fujitsu, and are at the forefront of introducing advanced technology, such as the new Samsung AI Heat Pump, to the market. This deep, practical knowledge ensures we provide advice that is not only accurate but also tailored to the unique climate and needs of New Zealand homeowners.

Why Do You Need to Replace Your Heat Pump?

You might need to replace your heat pump if it's over 10 years old, your energy bills are rising, you're experiencing frequent repairs, or if it's making strange noises. A new heat pump can offer significant benefits like improved efficiency, smart features, and better indoor air quality.

The 10 Warning Signs Your Heat Pump Needs Replacing

Age of the Heat Pump: The age of your heat pump is one of the most significant factors to consider. On average, heat pumps have a useful lifespan of 10 to 15 years. If your unit is approaching or has surpassed this age range, it’s a good idea to start thinking about a replacement. Older heat pumps are less efficient, more prone to breakdowns, and may not be filtering the air as effectively as modern units.
Rising Energy Bills: An unexplained increase in your energy bills can be a clear indicator that your heat pump is not operating efficiently. As heat pumps age, their components wear out, causing them to work harder and longer to maintain your desired temperature. This decreased efficiency directly translates to higher power consumption and costs.
Frequent Repairs: While a single repair might be a quick fix, if your heat pump is requiring frequent or costly repairs, replacing it may be more economical in the long run. The cumulative cost of multiple repairs can quickly exceed the price of a new unit. A new heat pump comes with a manufacturer's warranty, which typically covers parts and labour for five or more years, providing peace of mind and protection against unexpected expenses.
Inconsistent Temperatures: A properly functioning heat pump should maintain consistent temperatures throughout the room. If you notice hot or cold spots or the system struggles to maintain the set temperature, it's a sign of a decline in performance. This can be caused by various issues, including worn-out components, a refrigerant leak, or a failing compressor.
Unusual Noises: A healthy heat pump operates quietly. Unusual noises, such as grinding, squealing, or rattling, often signal that internal parts are worn out or damaged. While some issues can be repaired, recurring noises usually mean it's time to consider a new heat pump, as these sounds can indicate a more serious underlying problem.
Poor Air Quality: Your heat pump plays a vital role in maintaining indoor air quality by filtering and circulating air. If you notice a buildup of dust, a lingering musty smell, or an increase in allergens and humidity, your heat pump may be at fault. A new, modern heat pump with advanced filtration technology can significantly improve the air you breathe.
Excessive Cycling: Heat pumps should cycle on and off to maintain the desired temperature. However, if your unit is turning on and off too frequently (short-cycling), it could indicate a problem. This is inefficient and puts unnecessary stress on the system's components, leading to premature failure. Short-cycling can be caused by low refrigerant levels, a malfunctioning thermostat, or an improperly sized unit.
Visible Wear and Tear: Over time, heat pumps can show signs of physical deterioration, such as rust, corrosion, or damaged components on the outdoor unit. These issues can affect the unit’s efficiency and performance. If you notice visible damage, it’s crucial to have a professional assess whether repairs are sufficient or if a replacement is the smarter choice.
Outdated Technology: The HVAC industry is constantly evolving, with new advancements making systems more efficient and user-friendly. If your heat pump is 10 years or older, you may be missing out on key features such as Wi-Fi control, smart inverter technology, and advanced sensors that can detect human presence and conserve energy. Upgrading to a new unit can significantly enhance your comfort and reduce energy costs.
Environmental Impact: Older heat pumps may use harmful refrigerants, such as R-22, which have been phased out due to their ozone-depleting properties. Modern heat pumps use more environmentally friendly refrigerants, like R32, which have a lower Global Warming Potential (GWP). Replacing an old heat pump with a new, eco-friendly model is a proactive step toward reducing your carbon footprint.

Top signs its time to replace your heat pump

Benefits of Upgrading Your Heat Pump

Upgrading your heat pump offers numerous benefits beyond avoiding the issues listed above. Here are some additional advantages:

Improved Energy Efficiency: New heat pumps are designed with advanced technology that dramatically improves their energy efficiency, leading to significant savings on your energy bills.
Enhanced Comfort and Control: Modern heat pumps provide better temperature control and air distribution, ensuring a more comfortable and consistent living environment. Smart features allow you to control your system remotely via your smartphone.
Quiet Operation: Newer models are engineered to operate more quietly, reducing noise levels both inside and outside your home.
Increased Home Value: Upgrading to a new, efficient heat pump is an investment that can increase the value of your home and make it more attractive to potential buyers.
Better Air Quality: Advanced filtration systems in new units can remove more dust, allergens, and pollutants, contributing to a healthier indoor environment.

Choosing the Right Replacement Heat Pump

When it's time to replace your heat pump, selecting the right unit is essential for optimal performance and comfort. Here are some factors to consider:

Size and Capacity: The size and capacity of your new heat pump are crucial for its efficiency. A unit that is too small will struggle to heat or cool your home, while an oversized unit can short-cycle and waste energy. It's essential to have a professional from a company like OneAir conduct a load calculation to determine the appropriate size for your home.
Energy Efficiency: Look for heat pumps with high energy efficiency ratings, such as a high COP (Coefficient of Performance) for heating and EER (Energy Efficiency Ratio) for cooling. Energy-efficient models will reduce your power bills over their lifespan.
Features and Technology: Consider features that enhance comfort and convenience, such as Wi-Fi control, smart thermostats, variable-speed compressors, and advanced air filtration systems.
Brand and Warranty: Choose a reputable heat pump brand with a solid warranty to ensure you get a reliable and durable heat pump. Working with an authorized dealer like OneAir ensures you get a reliable unit and a robust warranty that provides peace of mind.
Professional Installation: Proper installation is critical for the performance and longevity of your new heat pump. Always hire a qualified HVAC professional to install your unit and perform any necessary maintenance.

Frequently Asked Questions:

Q: How long do heat pumps typically last in New Zealand?

A: Heat pumps in New Zealand generally have a lifespan of 10 to 15 years. However, proper maintenance and professional servicing can help extend their operational life.

Q: Will a new heat pump save me money on my energy bills?

A: Yes, absolutely. Modern heat pumps are significantly more energy-efficient than older models. Upgrading can lead to a noticeable reduction in your monthly energy bills as the new unit requires less power to heat and cool your home effectively.

Q: What does "short-cycling" mean, and why is it a problem?

A: Short-cycling is when a heat pump turns on and off too frequently. This is a problem because it's inefficient, increases wear and tear on the system's components, and can lead to premature failure. It often indicates a problem with the unit's size, thermostat, or refrigerant levels.

Q: How do I know what size heat pump is right for my home?

A: The correct size heat pump depends on factors like the size of the space, insulation, and window placement. It's crucial to have a professional, such as a technician from OneAir, conduct a site assessment and a load calculation to ensure you get a unit that is perfectly sized for your home's needs.

Is it time to replace your heat pump?

Recognising the signs that it's time to replace your heat pump can help you avoid unexpected breakdowns, high energy bills, and discomfort in your home. By understanding the common indicators of a failing heat pump and the benefits of upgrading, you can make an informed decision about when to invest in a new unit. Remember to choose a heat pump that meets your home's needs and to have it installed by a professional to ensure optimal performance and efficiency.

Upgrading to a new heat pump improves your home's comfort, enhances energy efficiency, and reduces your environmental impact. If you suspect your heat pump may be nearing the end of its useful life, don't wait until it fails completely. Start exploring your replacement options today and enjoy the benefits of a modern, efficient heat pump. Call us today at 0800 ONEAIR (663 247) or email hello@oneair.co.nz for a free consultation.