Multiple rooms. Multiple units. One visit that looks after all of them.
Whether every room is used differently, some rooms perform better than others, or the system has simply never had a professional look at it as a whole, a MiHT Multi-Split Restore services every unit individually and tests every room together before we leave. One visit. One written report. The whole system looked after.
Book a Multi-Split System Restore
We maintain your Multi-Split System. We do not sell or install new units.
Three Things a Professional Service Protects.
The air in every room your family uses. Each indoor head in your home circulates air through its own room independently. Over time, mould and dust build up inside each unit behind the filter where you cannot see it. That is what gets into the air your family breathes in the bedroom, the lounge, and every other room the system serves.
The outdoor unit your whole home depends on. — Every indoor head in your system connects to one outdoor unit. When the indoor heads are not maintained, that outdoor unit carries a heavier load every time the system runs. Keeping each head clean and efficient is the most direct way to protect the one part of the system that, if it fails, takes every room with it.
Your power bill across multiple rooms. — A multi-split system that has not been serviced uses more power than one that has. That inefficiency is not limited to one room. It runs across every head, every day the system operates. A professional service returns each unit to the efficiency it was designed to deliver.
The MiHT Multi-Split Restore: Assess, Treat, Monitor
A multi-split system is not one heat pump. It is multiple indoor units sharing a single outdoor unit, each collecting its own dust and mould independently depending on how much each room is used. The outdoor unit absorbs the combined load of all of them. A MiHT Multi-Split Restore treats every room as its own service.
Assess
Before any cleaning begins, your technician photographs each indoor unit and the outdoor unit and documents what they find. Each head is assessed individually. The outdoor unit is assessed separately. You see the starting point for every room, not just the system as a whole.
Treat
The filter:
We remove it, wash it with an antimicrobial solution, and dry it before refitting. Every room. Every unit.
Inside each unit:
Behind the filter is where most of the buildup lives. This is the part most owners never see and most operators never reach. We clean the surface the air passes through and the fan that moves it in every room.
The drain:
In cooling mode each indoor unit produces water that drains from inside the room to outside the house. Sludge from the internal buildup drips into this drain over time and blocks it. We clear every drain and add a slow-release tablet that slows future blockages.
The casing and remote:
We wipe down and sanitise the outside of every unit and every remote control.
The outdoor compressor:
The compressor outside your home produces the heating and cooling for every room simultaneously. We clear the debris around it and wash it down. Keeping it clear keeps the whole system running efficiently.
Running the full system:
Once every unit is done we run them all together. Every room at once. This confirms the whole system is performing as it should before we leave.
Monitor
After every visit you receive a single written condition report covering every indoor unit and the outdoor unit individually. Each finding is classified and documented. Annual Care Plan customers leave with their next visit already booked. We track every room's condition over time and catch problems before they become failures.
What happens if we find something
Every finding from your visit appears in your condition report with a clear action against it. Some things are taken care of on the day as part of the standard service. Some need a return visit to address properly. We will offer to book that before we leave. Some are outside our scope entirely. We document those with photographs so you have everything you need to take to a qualified specialist. And some are worth watching but not urgent. We note those and recheck them at your next visit.
What a multi-split system loses when it is not maintained
Every dirty indoor unit adds loadEvery indoor head in your home accumulates mould and dust over time. As that buildup restricts airflow, each unit has to work harder to heat or cool the room it serves.On a single-head system, that extra load stays in one place. On a multi-split, every indoor unit that is not performing adds to the load on the one outdoor unit handling the whole house.
The outdoor unit carries all of itThat outdoor unit is doing the heavy lifting for every room at once. The more strain it carries over time, the harder it works and the faster it wears. It is also the most expensive part of the system.If it fails, every room loses heating and cooling. Not just one. And because the outdoor unit on a multi-split carries more load than a single-head unit ever would, it is more exposed to the consequences of indoor units not being maintained.
Clean indoor units protect the whole systemKeeping every indoor head clean and running efficiently is the most direct way to protect it. When each unit is doing its job properly, the outdoor unit runs as it was designed to. Normal load. Normal lifespan.Turn a system running across multiple rooms into one that works as a single, balanced whole.
Find out where your system stands
What you receive after every Multi-Split Restore.
Every Multi-Split Restore produces a single written condition report covering the whole system. Each indoor unit is documented individually. The outdoor unit is documented separately. The load test result is recorded. The report is the evidence that every room was serviced and every component was measured.
Before-and-after photographs of all serviced components
Written notes on every significant finding and what was done about it
Clear guidance on anything that needs a follow-up visit
Documentation of any issues outside MiHT's scope for your installer
A record of system condition at the time of service - useful for warranty purposes, insurance, or property records
How Would You Like Us to Look After Your System?
If your system has never been professionally serviced, start with a One-Off Restore. If you want your system looked after year after year without having to think about it, an ongoing care plan is the better option. Here is how to choose
Annual Care Plan: Scheduled once per year. Recommended for all multi-split systems in year-round use, and for any system installed in a coastal or high-use environment.
Biennial Care Plan: Scheduled every two years. Suitable for systems used seasonally or in low-occupancy properties. Note that duct integrity can deteriorate between biennial visits in older installations.
One-Off Restore: The right starting point if your system has never been professionally serviced or you want to know exactly what condition it is in. From $374. Includes the full service and a written condition report. No ongoing commitment required.
Pricing: Multi-Split Restore: $374 inc GST for 2 indoor units and 1 outdoor unit.
Additional indoor units: $189 inc GST per unit.
Not sure which system you have?
If your heating and cooling comes through ceiling vents from a hidden ceiling unit, that is a ducted system. See ducted heat pump maintenance →
FAQs
Find answers to common questions about MiHT Multi-Split System Cleaning
A multi-split system has one outdoor unit connected to two or more indoor heads in different rooms. The outdoor unit will have multiple refrigerant pipe connections running to different parts of the house. If your home has two or more indoor heat pump units but only one outdoor unit, you have a multi-split. If each indoor unit has its own separate outdoor unit, those are individual systems and are serviced under a standard wall and floor heat pump Restore. If you are not sure, note your system configuration when booking and we will confirm before the visit.
Yes. Each indoor unit on a multi-split system can be individually controlled, scheduled, and set to its own temperature. This is one of the key advantages of a multi-split over a ducted system. The one constraint to be aware of is that all indoor units on the system must operate in the same mode at the same time: all on heating, or all on cooling. You cannot run one room on heating and another on cooling simultaneously. Within that constraint, each room operates independently.
Annual professional servicing is the standard for multi-split systems in year-round use. Systems with three or more indoor units, homes with pets or high dust levels, and households with occupants who have respiratory sensitivities benefit from servicing every twelve months. With a multi-split, each indoor unit is accumulating its own buildup at the same time. The combined effect on the outdoor unit is greater than it would be on a single-head system, which is why keeping up with regular servicing matters more, not less. The Home Energy Health Assessment takes about three minutes and gives you a personalised result based on your own system.
MiHT services all major multi-split heat pump brands operating in New Zealand, including Mitsubishi Electric, Panasonic, Fujitsu, Daikin, LG, Samsung, Toshiba, Hitachi, and others. The Multi-Split Restore process is brand-agnostic: the same process applies to every indoor unit regardless of manufacturer. MiHT does not install or repair, so there is no brand affiliation and no incentive to recommend one make over another. If you are unsure whether your system is covered, contact us before booking and we will confirm.
Book a service. 24 hours a day. Select your service type, choose a time that suits you, and receive instant confirmation. On the day of your service you will receive live GPS tracking of your technician. The full Restore takes two to four hours depending on system size.
Each indoor unit in a multi-split system accumulates its own biological buildup independently. The barrel fan in one room develops its own mould ring. The coil in another room builds its own layer of biofilm. Servicing without individual containment risks circulating contamination from one room to another. MiHT installs a separate wash bag and full site protection in each room before beginning work. Each unit is treated as its own service. The system is only tested as a whole at the end, once every unit has been individually restored.
The manifold is where the refrigerant pipes from all indoor units connect to the outdoor compressor. It is specific to multi-split systems and does not exist on single-head installations. MiHT includes a visual inspection of the pipe connections and insulation at the outdoor manifold as part of every Multi-Split Restore. The inspection checks for insulation degradation, visible refrigerant staining, and any physical damage to the pipe connections. Findings are documented in the condition report. Any issues outside MiHT's maintenance scope are noted with a recommendation to engage a refrigeration technician
Once every indoor unit has been restored, all heads are operated simultaneously. This tests that the outdoor compressor can handle the full combined load of the system without triggering a fault or error code. A single-unit service cannot perform this test, because the compressor is never asked to run every head at once. The load test result is documented in the condition report. A clean load test confirms the system is performing as designed across every room. An error code during the load test is documented.
Professional maintenance by a qualified technician supports rather than affects a heat pump warranty. Most manufacturers require evidence of regular maintenance, and a lack of service history is more likely to affect a warranty claim than a documented service record. The condition report produced at every MiHT Multi-Split Restore provides written evidence that every indoor unit and the outdoor unit have been professionally maintained. Manufacturer warranties typically exclude damage caused by neglect, which regular professional servicing is designed to prevent. For specific warranty questions, refer to your unit's documentation or contact the manufacturer directly.