If your heat pump has developed a musty smell, is costing more to run, or is not heating as well as it used to, those are not separate problems. They are common symptoms of the same cause: a system that has not received a complete professional service.
What most Auckland homeowners do not realise is that there are two distinct levels of heat pump service. Understanding the difference matters, because most providers offer only one of them, and it is rarely the one your system actually needs.
Auckland's climate makes this particularly important. High summer humidity, warm temperatures year-round, and coastal salt air across much of the region create conditions that degrade heat pump systems faster than in drier parts of New Zealand. A service standard that might be adequate elsewhere is often insufficient here.
Please note: this article covers wall mounted and floor mounted heat pump units. If you have a ducted heat pump system, see our ducted heat pump servicing guide. If you have a multi-split system, see our multi-split heat pump servicing guide.
Two Levels of Service: Refresh and Restore
A Restore is a full deep clean and the service we recommend for any wall or floor mounted heat pump operating under normal residential conditions in Auckland. If your heat pump runs through both winter and summer, handles regular daily use, or has not had a professional deep clean in the past twelve months, a Restore is the appropriate service.
A Refresh is a lighter maintenance visit appropriate only in specific circumstances: a system in an unusually clean environment with very light use, or as an interim service for a unit that received a Restore within the past six months. It is not the correct starting point for most Auckland homes.
When comparing quotes from other providers, it is worth asking what their service actually covers. Most standard heat pump services in Auckland include what we describe as a Refresh. If your system is showing any of the symptoms described above, a Refresh will not resolve them. To find out more about what MiHT covers, visit our heat pump cleaning and maintenance Auckland page.
What Each Service Covers
Both a Refresh and a Restore follow the same three-stage protocol: Assess, Treat, Monitor. The depth of the Treat stage is where they differ.
Every service begins with an assessment before any cleaning takes place. The technician checks system operation, measures airflow, inspects accessible components, and photographs the condition of the unit. This stage establishes what is actually present inside the system before any work begins. You cannot treat what you have not assessed.
What a Refresh includes:
Filter care: your heat pump draws air through a mesh filter before circulating it through your home. Over time that filter collects dust, pet hair, and airborne particles. A clogged filter forces the system to work harder to move air, which raises your power bill and can trigger error codes on the unit. During a Refresh, the filters are removed, washed, dried, and refitted, which restores normal airflow and removes the layer of debris your family would otherwise be breathing.
Drain flush: when your heat pump runs in cooling mode, it pulls moisture out of the air. That moisture drains away through a small pipe. Over time, algae and debris build up inside that pipe and the tray it drains from, causing blockages. A blocked drain has nowhere to go except back into the unit and eventually onto your ceiling or wall below. Flushing the drain at each service costs very little and prevents one of the most common and expensive heat pump-related damage calls we see.
Surface hygiene: the outer casing and the louvres that direct airflow are cleaned and sanitised. This removes surface dust and bacteria from the parts of the unit your family is closest to every time it runs.
Outdoor visual check: the outdoor unit is inspected to confirm it is secure, that the vents are clear, and that vegetation or debris has not built up around it. A blocked outdoor unit cannot exchange heat efficiently, which means the system runs longer and costs more to achieve the same result.
Operational test: the system is run in both heating and cooling modes to confirm it is functioning correctly before the technician leaves.
What a Restore adds:
Indoor coil deep clean: behind your filter sits a set of tightly packed metal fins called the indoor coil. This is the component that actually heats or cools the air before it enters your room. Because it sits right behind the filter, it catches everything the filter misses. In Auckland's humid summers, your heat pump removes large volumes of moisture from the air during cooling mode, and that moisture passes directly across these fins. Over time, a layer of dust, organic matter, and mould builds up deep within the fins where a simple spray cannot reach. The result is air that smells stale, a system that struggles to reach the temperature you set, and mould being circulated through your home every time the unit runs. During a Restore, the coil is cleaned using a low-pressure sprayer and specialist solution that breaks down the buildup from within the fins and flushes it out completely, restoring the coil's ability to heat and cool efficiently and removing the biological matter affecting your air quality.
Barrel fan restoration: inside the unit there is a cylindrical drum that spins to push air across the coil and out into your room. Think of it as the engine that moves the air you breathe. In Auckland's warm, damp climate this drum is constantly exposed to moisture, and over time it develops a thick coating of mould across its surface, often several millimetres deep in systems that have never had a proper clean. This is the single most common source of the musty smell that heat pump owners notice. Every time the unit runs, that mould is loosened and pushed into the air in your home. During a Restore, the drum is pressure washed to remove the buildup entirely, which eliminates the smell at its source rather than masking it.
Chemical sanitisation: after the physical cleaning is complete, an enzyme-based solution is applied throughout the interior of the unit. This neutralises any remaining mould, bacteria, and odour-causing organisms at a biological level. The result is a system that does not just look clean but is genuinely hygienic, which matters particularly for families with young children, allergies, or respiratory conditions.
Outdoor unit wash: the outdoor unit contains the components responsible for releasing heat to the outside air in summer and extracting it in winter. For properties located close to the coast, salt-laden air deposits a fine residue across the outdoor unit over time, which blocks the tightly packed fins, forces the system to work harder, and accelerates corrosion of the metal components. Left unaddressed, this shortens the life of the outdoor unit considerably and raises your running costs. During a Restore, the outdoor unit is fully pressure washed to remove salt, dirt, and debris, which reduces running costs and protects your investment.
Performance diagnostics: temperature output is measured before and after the clean so you can see the actual efficiency gain the service produced. If a clean makes no measurable difference, you will know. If it restores significant output, the data confirms it.
A professional service does not end when the technician leaves. The monitor stage documents what was found, what was done, and what needs attention at the next visit. This includes before and after photographs of key components so you can see exactly what the service achieved. It also confirms when your next service is due, so your system stays on a consistent maintenance cycle rather than being serviced reactively when something fails.
How Do You Know Which Service You Need?
For the majority of Auckland homes, a Restore is the right starting point. Any wall or floor mounted heat pump that runs through winter and summer, serves a normal household, or has not had a full deep clean in the past twelve months should receive a Restore. Given Auckland's humidity and coastal environment, the conditions that drive internal degradation are present in most homes across the region.
A Refresh is appropriate only where a system is lightly used, operates in a very clean environment, or received a Restore within the past six months and is being maintained between full cleans.
After an initial Restore, a Refresh is typically sufficient as an interim visit for well-maintained systems. Your technician will confirm the appropriate schedule based on what they find during the service. Ready to book? You can schedule your Restore online.
Why This Matters Beyond the Clean
Proper maintenance extends system life. A heat pump that receives regular professional care will typically last significantly longer than one that receives only occasional filter changes. It also identifies installation issues that would otherwise go undetected. Poorly routed drain hoses and units positioned in ways that cause unnecessary wear are found during thorough assessments and addressed before they become expensive problems.
If your last service did not include before and after photos, documentation of findings, and a confirmed next visit, it is worth asking what was actually covered. Not sure where to start? Take our free Home Energy Health Assessment.
How Often Should an Auckland Heat Pump Be Professionally Serviced?
For most Auckland homes, an annual Restore is the appropriate frequency. Given the region's humidity and coastal conditions, many homes benefit from a Restore every six months, particularly those close to the coast, those with daily use, or those with occupants who have respiratory sensitivities. Regular filter cleaning by the homeowner between services is useful, but it does not replace the coil cleaning, drain flushing, and system assessment that a professional visit covers.
Frequently Asked Questions
What is the difference between a heat pump Refresh and a Restore?
A Refresh covers the filter, drain system, surface clean, outdoor visual check, and operational test. It is appropriate for lightly used systems in very clean environments. A Restore includes all of that plus a deep clean of the indoor coil, the internal fan drum, and the outdoor unit, along with sanitisation and performance testing. It is the correct service for any heat pump in normal residential use.
Do Auckland heat pumps need more frequent servicing than other parts of New Zealand?
Yes, in most cases. Auckland's high summer humidity accelerates mould growth inside heat pump units, and coastal salt air across much of the region deposits a corrosive residue on outdoor units. These conditions mean that Auckland heat pumps degrade faster internally than those in drier, inland locations, and regular professional servicing is particularly important.
Do I need a Refresh or a Restore?
For most Auckland homes, a Restore is the correct service. Any heat pump that runs through both winter and summer under normal household conditions should receive a Restore. A Refresh is reserved for lightly used systems or as an interim service between full cleans.
What is included in a professional heat pump service in Auckland?
A Refresh includes filter care, drain flush, surface hygiene, outdoor visual check, and an operational test. A Restore adds a deep clean of the indoor coil and internal fan drum, sanitisation, a full outdoor unit wash, and performance testing. Both services include before and after photos and a written service report.
How long does a heat pump service take?
A Refresh typically takes 30 to 45 minutes. A Restore takes 45 to 60 minutes. A visit that takes 20 minutes or less has not covered the full system.
How do I know if my heat pump has been properly serviced?
A properly completed service comes with before and after photos of key internal components, written documentation of what was found and what was done, and a confirmed schedule for the next visit.
How often should an Auckland heat pump be serviced?
An annual Restore is appropriate for most Auckland homes. Those close to the coast, with high usage, or with occupants who have respiratory conditions may benefit from a Restore every six months.
Does this apply to ducted or multi-split heat pumps?
This article covers wall mounted and floor mounted heat pump units only. Ducted heat pump servicing involves different procedures and is covered in our ducted heat pump servicing guide. Multi-split systems are covered in our multi-split heat pump servicing guide.