TPS HVAC Services

HVAC stands for heating, ventilation and air conditioning. In a commercial building it covers the plant that heats, cools, moves and filters air: split and multi-split units, VRF systems, ducted systems and cassettes, air handling and fan coil units, chillers and cooling towers, mechanical ventilation and extract, and the controls or building management system that runs them.

The distinction that matters for maintenance is between the systems that condition air and the systems that supply and remove it. Air conditioning changes the temperature of air that is largely recirculated. Ventilation brings outside air in and takes stale air out. A building can be perfectly cool and still feel stuffy, because those are two different problems with two different fixes.

TPS services all of the above across New Zealand commercial property, as a standalone HVAC contract or as part of a wider property services agreement.

Most commercial HVAC needs servicing every three to six months, not annually. Offices with standard split or ducted systems usually run on a six-monthly cycle with filter attention in between. Plant in high-use, coastal, dusty or hospitality environments needs quarterly service, and air handling units, chillers and cooling towers are generally on a monthly to quarterly regime set by the building’s compliance schedule.

The frequency is not a matter of preference. If your system is a specified system on a compliance schedule, the schedule states the inspection and maintenance intervals, and AS/NZS 3666.2 sets the maintenance regime for air-handling and water systems. Servicing less often than the schedule requires puts your Building Warrant of Fitness at risk.

The practical test is whether the interval matches the environment. A café kitchen extract and a first-floor office cannot sensibly share a service cycle, and a good contractor will set different intervals for different plant in the same building rather than putting the whole site on one visit.

In 2026, planned maintenance is increasingly recognised as a more cost-effective approach to HVAC servicing than relying on reactive maintenance when problems arise. Across the lifecycle of equipment, planned maintenance programmes have been shown to reduce costs by up to 29%, while also helping to identify potential issues before they become more disruptive and expensive to resolve.

Larger plant is quoted differently. Air handling units, chillers and cooling towers are priced against the maintenance regime in the compliance schedule rather than per unit, and most multi-unit or multi-site buildings are put on a fixed annual maintenance contract with scheduled visits, agreed response times and reactive repairs charged on top.

The cheapest contract is rarely the cheapest year. Ask what the price covers and what it excludes, whether filters and consumables are included, what the callout response time is, and whether compliance inspection and BWoF reporting are inside the fee or billed separately. Those exclusions are where an apparently low annual price turns into a large one.

In most commercial buildings, yes. Mechanical ventilation and air conditioning is Specified System 9 under the Building Act 2004, which means it is listed on the building’s compliance schedule with set performance standards and inspection, maintenance and reporting procedures. The building owner must then supply the territorial authority with a Building Warrant of Fitness each year confirming those procedures have been followed.

Inspections behind a BWoF must be carried out by an Independent Qualified Person, and the maintenance records are the evidence. Where a building has air-handling or water systems such as cooling towers, AS/NZS 3666.2 sets the operation and maintenance regime for microbial control. Failing to maintain a compliance schedule or to supply a BWoF is an offence under the Building Act and carries fines.

In practice, buildings fail on paperwork more often than on plant. Records that are incomplete, held by a contractor who has since been replaced, or not written in a form an IQP can sign off are the most common cause of a BWoF problem, which is why maintenance records should be part of the contract specification rather than an afterthought.

A preventative maintenance visit covers filter cleaning or replacement, indoor and outdoor coil and condenser cleaning, condensate drain and tray clearing, refrigerant charge and pressure checks for leaks, electrical connection and current draw testing, belt, bearing and fan inspection, control and thermostat calibration, and a check that the system is running to its intended schedule and setpoints. It finishes with a written report on condition and any remedial work.

The report is the part most people underuse. It should tell you what was found, what was fixed on the day, what needs to be scheduled, and what is approaching end of life, so plant replacement can go into a budget rather than arriving as an emergency.

TPS provides detailed reporting and life cycle analysis on serviced assets, and clients can see completed work and log new requests through an interactive platform with visual reporting.

Filters in a commercial building are usually cleaned or replaced every one to three months, depending on the environment and the filter grade, and every service visit at minimum. Ductwork is inspected on the cycle set by the compliance schedule and cleaned when inspection shows it is needed, which for a typical office is every three to five years and considerably more often for kitchen extract, healthcare and industrial systems.

AS/NZS 3666.2 governs operation and maintenance of air-handling systems for microbial control, and duct cleaning under that framework is condition-based rather than calendar-based. The inspection is what triggers the clean, so a contractor who proposes a fixed duct cleaning cycle without inspecting is selling a product, not maintaining a system.

Blocked filters are the most common and most expensive fault in a commercial building, because the plant compensates by running harder and the cost shows up quietly on the power bill every month rather than as a breakdown.

Uneven temperature and stuffiness usually come from air distribution, zoning, controls or ventilation rather than from the air conditioning failing. The most common causes are blocked filters, a system zoned for a floor plan that has since been reconfigured, control setpoints and schedules that no longer match occupancy, a failed economy cycle, or insufficient outside air being brought in even though the temperature is correct.

Temperature and air quality are separate problems. Ventilation in New Zealand is governed by clause G4 of the Building Code, with NZS 4303 setting ventilation rates for acceptable indoor air quality. A space can be at the right temperature and still feel stale, because the system is recirculating conditioned air without bringing in enough fresh air for the number of people now in the room.

The fix is diagnostic rather than mechanical. Measure the space, look at how it is genuinely occupied, check controls and zoning before touching plant, and separate the cheap fixes from the capital ones. Replacing a unit that was never the problem is the most expensive outcome available.

Commercial HVAC plant generally has a design life of 15 to 20 years, with split systems at the shorter end and well maintained chillers and air handling plant at the longer end. The replacement trigger is rarely age on its own. It is the point where annual repair and energy cost, parts availability and breakdown frequency together exceed the cost of capital on new plant.

Four signals usually mean replacement rather than another repair: repeated failures of the same component, refrigerant that is obsolete or being phased down and therefore expensive and hard to source, rising energy consumption for the same output, and a system that no longer suits how the building is used.

The best way to make that call is with maintenance history and life cycle analysis rather than a quote on the day the unit fails. Staged replacement across financial years, replacing the worst performing plant first, is almost always cheaper and easier to approve than a full plant replacement forced by a breakdown.

HVAC is the largest energy load in most commercial buildings, easily accounting for up to 40% of energy costs, so it is where efficiency work pays back fastest. The reliable savings come from control and schedule correction so plant is not conditioning an empty building, restoring economy cycles, eliminating simultaneous heating and cooling, cleaning coils and filters, and replacing only the specific plant that is dragging system performance down.

Measurement comes first. An energy audit that establishes what the plant is actually consuming, when, and against what occupancy is what separates a saving from a guess, and it also gives you the evidence to support a capital request.

If your building is pursuing a NABERSNZ rating, administered by the New Zealand Green Building Council, HVAC is the biggest single lever on the result, particularly for a base building rating driven by core services.

TPS is an NZGBC member and holds ISO 14001 environmental accreditation, and provides energy management, auditing and the reporting a rating or sustainability disclosure needs.

Yes. Anyone filling containers with gases under pressure, including refrigerant, must be trained and hold an approved filler compliance certificate. Refrigerant handling in New Zealand also sits under WorkSafe’s hazardous substances regime. Refrigerants are synthetic greenhouse gases regulated by the EPA, with HFC imports being phased down, making some older refrigerants increasingly expensive and harder to source.

TPS is registered and appropriately certified to handle refrigerants, giving building owners confidence that HVAC and refrigeration work is being carried out by trained, qualified technicians in accordance with New Zealand requirements.

For a building owner, this matters in three ways. Uncertified handling creates a compliance exposure for both you and your contractor. Refrigerant leaks are an environmental liability as well as a performance issue, because a system running low on charge has to work harder for less output. And if your plant uses a refrigerant being phased down, it is important to have a replacement plan before availability becomes an issue.

When choosing an HVAC contractor, ask for evidence of technician certification and refrigerant-handling credentials, how leaks are detected and reported, and what their plan is for any plant in your building using a phase-down refrigerant.

TPS can help with compliant HVAC maintenance, refrigerant handling, leak detection and planning for the future of your building’s HVAC systems.