Rooftop vs Split-System: Which Commercial Air-Conditioner Fits Your Premises?

Rooftop vs split system commercial air conditioning. What is the right for your business?

1. Quick Comparison Table

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2. What Is a Rooftop Package Unit (RTU)?

A rooftop unit is a single, factory-built HVAC package that sits on the roof. It houses compressor, evaporator, condenser, and supply/return fans in one weather-tight cabinet. Supply and return ductwork penetrate the roof to serve the occupied area below.

Pros

• All-in-one footprint makes installation quick.

• Frees up valuable floor area for revenue-earning use.

• Easy to service without disrupting tenants.

• Built-in economisers can use free cooling on mild nights.

Cons

• Crane lift can add $3 000–$10 000 to install.

• Exposed to salt and UV—requires quality coating.

• Long duct runs can create static-pressure losses if badly designed.

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3. What Is a Commercial Split System?

A split system separates the outdoor condenser from one or more indoor fan-coil units. Refrigerant lines run between them. Commercial-grade splits start at 7 kW and go up to ~25 kW per head; multiple heads can serve zones independently.

Pros

• Lower up-front equipment cost.

• Energy-efficient inverter compressors.

• Flexible zoning—cool offices and meeting rooms separately.

• Easier to retrofit where roof space is restricted.

Cons

• Indoor units consume ceiling/wall real estate.

• Drainage piping through ceiling voids needs fall and insulation.

• Multiple condensers can clutter façades if not planned.

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4. Six Factors to Help You Decide

4.1 Building Size & Layout

• < 500 m² with internal partitions → split systems or VRF.

• > 500 m² open warehouse/retail → rooftop package.

4.2 Roof Structure & Crane Access

Steel portal frames and flat roofs take RTU weight easily. Heritage roofs? Go split.

4.3 Installation Budget vs Life-Cycle Cost

Splits cost ~15 % less in hardware but can run extra refrigerant piping and future maintenance. RTU cranes are expensive up-front but lower long-term service costs.

4.4 Energy Efficiency Targets

• RTU with economiser + VSD fans can reach COP > 4.0.

• Split with high-SEER inverter hits COP 3.5–4.2, great for small zones.

4.5 Maintenance Access & Tenant Disruption

RTU: techs work outside, zero disruption. Splits: quarterly filter changes above desks; schedule after hours.

4.6 Future Expansion

RTU capacity upgrades mean swapping one unit. Splits: add another head/compressor pair, but pipework limits may apply.

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5. Real-World Case Studies

Case 1 — Yatala Logistics Warehouse (2 000 m²)

A client installed two 85 kW RTUs with duct sox. Result: 18 % lower operating cost vs multiple splits, zero floor-space loss.

Case 2 — Surfers Paradise Boutique Hotel (30 rooms)

Replaced ageing RTUs with 14 high-SEER split systems for zoning per room. Guests now control their own climate; electricity use down 12 %.

6. Frequently Asked Questions

Which system is cheaper to maintain?

• RTUs centralise components—one set of filters, belts, and coils—generally reducing annual service labour by 10–20 % compared with many split units.

Do rooftop units need planning approval?

•  In Queensland most roofs allow RTUs under “minor mechanical plant,” but councils may require development approval in noise-sensitive zones.

Can you mix both systems?

• Yes—common in large retailers: RTU for shop floor, splits for offices and server rooms.
• Acro designs hybrid solutions.

7. Book a Free Cooling Audit

Not sure which HVAC option fits your site? Our engineers model load profiles, roof loads, and ROI—free across Brisbane, Logan, and the Gold Coast.

📞 1300 227 600 • Request your audit →

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Areas We Service — Commercial Air-Conditioning & Refrigeration

Gold Coast

• Southport CBD & Chinatown Precinct

• Surfers Paradise & Chevron Island

• Broadbeach (Convention Centre & restaurant strip)

• Robina & Varsity Lakes Business Parks

• Burleigh Heads & Burleigh West Industrial Estate

• Molendinar / Ashmore Industrial Area

• Nerang & Carrara Trade Precincts

• Arundel & Parkwood light-industrial zones

• Helensvale Town Centre & Westfield

• Coomera Marine & Theme-Park Corridor

• Yatala / Ormeau / Stapylton Enterprise Area

• Currumbin Waters & Southern Gold Coast Airport Precinct

Brisbane

• Brisbane CBD & Queen St Mall

• Fortitude Valley, Newstead & Teneriffe riverside precincts

• South Brisbane, West End & Woolloongabba stadium corridor

• Milton, Toowong & Indooroopilly commercial hubs

• Bowen Hills, Albion & Breakfast Creek Road showrooms

• Eagle Farm, Hamilton & Pinkenba TradeCoast logistics zone

• Northgate, Virginia, Banyo & Geebung industrial estates

• Chermside & Aspley retail/commercial centres

• Rocklea, Acacia Ridge & Cooper Plains freight precincts

• Salisbury & Mount Gravatt enterprise corridors

• Eight Mile Plains & Brisbane Technology Park

• Murarrie, Cannon Hill & Port of Brisbane corridor

• Wynnum–Manly & Gateway East Trade Precinct

• Capalaba & Redlands light-industrial area

• Brendale & Strathpine business parks

Logan & Southern Corridor

• Springwood & Slacks Creek motor-retail strip

• Underwood & Kingston industrial estates

• Meadowbrook Health & Education Precinct

• Logan Central & Woodridge retail hubs

• Loganholme, Tanah Merah & Shailer Park commercial zone

• Berrinba Logistics Estate & Crestmead Industrial Park

• Beenleigh & Yatala South enterprise area

• Park Ridge, Browns Plains & Hillcrest trade centres

• Yarrabilba town centre

Need service outside these suburbs?
Call 1300 227 600— our technicians travel wherever Queensland businesses need reliable air-conditioning and refrigeration support.