How often should commercial air conditioning be serviced?

Quarterly at minimum for standard office and retail plant, monthly for server rooms, food retail, medical facilities and process cooling. Filters in high-occupancy or dusty environments often need monthly attention regardless of the service interval.

Is a commercial HVAC maintenance contract worth it?

For any building where an HVAC failure costs trading, productivity, stock or tenant goodwill, yes. Planned maintenance reduces breakdown frequency, keeps energy use down and extends plant life, and the report trail lets you budget replacements instead of paying emergency rates.

What is the difference between a comprehensive and a standard maintenance agreement?

A standard or labour-only agreement covers scheduled visits, with breakdowns and parts charged separately. A comprehensive agreement includes breakdown attendance and often parts for a higher fixed fee. Comprehensive suits critical sites that need budget certainty; standard suits most offices and retail.

Do commercial buildings in WA have to maintain their HVAC?

Building owners and employers have duties under WA work health and safety law to maintain a safe environment, and air-handling systems are referenced in Australian Standards for microbial control. Lease agreements also commonly require the tenant or landlord to maintain HVAC in good working order. A documented maintenance program is how you evidence all three.

Does NCA HVAC offer commercial maintenance agreements in Perth?

Yes. NCA HVAC provides planned preventative maintenance for commercial air conditioning and refrigeration across the Perth metropolitan area, with an asset register, itemised task lists, written reports after every visit and priority breakdown response for agreement customers.

Commercial HVAC Maintenance Contracts in Perth: What Facility Managers Should Expect (and What to Check Before Signing)

A buyer's guide to planned preventative maintenance for offices, retail, warehouses and multi-tenant buildings.

By Nik Jankovic, owner and lead technician at NCA HVAC. ARC licence AU069671Published 7 September 20269 min read

Short answer

A commercial HVAC maintenance contract in Perth should specify quarterly service visits at minimum, an itemised task list per equipment type, filter and coil cleaning schedules, an asset register, a written report after every visit, a guaranteed breakdown response time, and clear pricing for parts and after-hours work. Planned maintenance typically costs 2 to 4 percent of the plant's replacement value per year and cuts breakdown call-outs and energy use by enough to pay for itself in most buildings.

Key takeaways

Quarterly is the minimum for commercial plant. Monthly for critical spaces, server rooms and high-load retail.
Insist on an asset register and an itemised task list per unit. A contract that says 'service all HVAC' has no enforceable scope.
Response time for breakdowns should be written in hours, with after-hours rates stated up front.
Reports after each visit, with photos and a defect list, are what let you budget replacements instead of reacting to failures.
Ask for the technician's ARC licence number and confirm electrical work is done by a licensed electrical contractor.

What is a commercial HVAC maintenance contract?

A planned preventative maintenance (PPM) agreement is a fixed-term contract, usually 12 to 36 months, under which an HVAC contractor services a building's heating, cooling, ventilation and refrigeration plant on a set schedule for a fixed fee, and attends breakdowns at an agreed response time and rate. The alternative is reactive maintenance: calling someone when something fails. For any site where a failure costs trading, productivity or stock, reactive maintenance is the expensive option.

Why Perth commercial buildings need a maintenance schedule

HVAC is typically the largest single energy user in a Perth office or retail building, often 40 percent or more of electricity consumption. It is also the system tenants complain about first. Perth's summer puts rooftop plant under 45 degree ambient conditions for weeks, and coastal sites add salt corrosion. Plant that is not cleaned and checked loses capacity each season until it cannot hold the space at 24 degrees on the days it matters most.

Maintained plant also lasts longer. A packaged rooftop unit or a VRF system that gets quarterly attention commonly runs 15 to 20 years; the same plant neglected often needs a compressor or a full replacement inside 10.

What the contract should include

Minimum content of a defensible PPM agreement.
Section	What to look for
Asset register	Every unit listed with make, model, serial, location, capacity and age. This is the scope; without it the contract is vague.
Task list per asset type	Separate itemised checklists for splits, ducted, packaged units, VRF, chillers, coolrooms, exhaust and fresh-air systems.
Visit frequency	Quarterly minimum. Monthly for server rooms, food retail, medical and process cooling. State which visits are 'major' and which are 'minor'.
Filters and coils	Filter replacement or clean schedule and coil cleaning frequency stated explicitly, with the cost of filters included or itemised.
Breakdown response	Response time in hours for business hours and after hours, and whether attendance is included or charged.
Parts and labour pricing	Hourly rates, after-hours multipliers, parts mark-up, and a quote threshold above which written approval is required.
Reporting	Written report after each visit: tasks done, readings taken, defects found, photos, recommended repairs with prices.
Compliance	ARC licence number for refrigerant work, electrical licence for electrical work, public liability insurance certificate, and any building-specific standards referenced.
Term and exit	Term, price review mechanism, notice period, and what happens to outstanding recommendations at termination.

What a quarterly visit should cover

Filters inspected and cleaned or replaced on every unit, with differential pressure or visual condition recorded.
Condenser and evaporator coils inspected and cleaned as scheduled; condenser fans and clearances checked.
Refrigerant circuit checked for leaks, with pressures and superheat or subcooling recorded against manufacturer data.
Electrical inspection: contactors, capacitors, terminal tightness, compressor and fan amperage against nameplate.
Controls: setpoints, schedules, economy cycle and sensor calibration checked; BMS alarms reviewed where fitted.
Condensate drains flushed and trays cleaned; treatment applied where microbial growth is present.
Belts, bearings and fan motors checked on air-handling units and exhaust fans.
Ductwork, dampers and zone actuators checked on ducted systems.
Temperature and airflow spot-checks in occupied spaces; tenant complaints logged and addressed.
Written report issued with readings, defects and priced recommendations.

How much does commercial HVAC maintenance cost in Perth?

For planning, budget 2 to 4 percent of the plant's replacement value per year for a quarterly PPM agreement. In practice, a small office with four to six split or ducted systems typically pays $1,200 to $3,000 a year. A mid-size retail or office building with packaged rooftop units, VRF and exhaust systems typically sits between $5,000 and $20,000 a year. Sites with chillers, cooling towers or extensive refrigeration are quoted individually. Breakdown attendance and parts are usually additional unless the agreement is a comprehensive one, which costs more and suits critical sites.

Clauses that catch people out

Filters excluded. Some agreements clean filters but charge separately for replacement media on every visit. Ask for the annual filter cost up front.
No response-time commitment. 'Best endeavours' means nothing on a 42 degree day when every contractor is busy.
Coil cleaning 'as required'. This is code for 'not included'. Specify annual condenser cleaning at minimum.
Auto-renewal with price escalation above CPI. Diarise the notice period.
Recommendations without prices. A report that lists defects but no costs cannot be actioned or budgeted.
Subcontracted refrigerant work. Confirm who holds the ARC licence and who is on site.

Questions to ask before you sign

Can you provide a sample report from a similar site?
What is your guaranteed response time in January, and what is the after-hours rate?
Who will attend, and are they employed or subcontracted?
What is your ARC licence number and your electrical contractor's licence number?
How do you handle a unit you consider uneconomic to repair?
What are the total first-year costs including filters and any initial remedial work?

Frequently asked questions

How often should commercial air conditioning be serviced?: Quarterly at minimum for standard office and retail plant, monthly for server rooms, food retail, medical facilities and process cooling. Filters in high-occupancy or dusty environments often need monthly attention regardless of the service interval.
Is a commercial HVAC maintenance contract worth it?: For any building where an HVAC failure costs trading, productivity, stock or tenant goodwill, yes. Planned maintenance reduces breakdown frequency, keeps energy use down and extends plant life, and the report trail lets you budget replacements instead of paying emergency rates.
What is the difference between a comprehensive and a standard maintenance agreement?: A standard or labour-only agreement covers scheduled visits, with breakdowns and parts charged separately. A comprehensive agreement includes breakdown attendance and often parts for a higher fixed fee. Comprehensive suits critical sites that need budget certainty; standard suits most offices and retail.
Do commercial buildings in WA have to maintain their HVAC?: Building owners and employers have duties under WA work health and safety law to maintain a safe environment, and air-handling systems are referenced in Australian Standards for microbial control. Lease agreements also commonly require the tenant or landlord to maintain HVAC in good working order. A documented maintenance program is how you evidence all three.
Does NCA HVAC offer commercial maintenance agreements in Perth?: Yes. NCA HVAC provides planned preventative maintenance for commercial air conditioning and refrigeration across the Perth metropolitan area, with an asset register, itemised task lists, written reports after every visit and priority breakdown response for agreement customers.