How Much Does Air Con Cost to Run?

How Much Does Air Conditioning Cost to Run? | Brisbane Guide

Running Costs for Split Systems, Ducted AC and Portable Units in Brisbane

Air conditioning running costs depend on the type of system, its size, how efficiently it operates and how many hours you use it. In Brisbane’s subtropical climate, AC can account for 30 to 50 percent of your electricity bill during summer. For homeowners across North Lakes, Redcliffe, Mango Hill, Chermside and Aspley, here is what it actually costs to run different types of air conditioning.

Air Conditioning Running Costs Comparison

System Type	Hourly Cost	Daily (8 hrs)	Monthly (8 hrs/day)
Small split (2.5kW)	$0.18 – $0.30	$1.44 – $2.40	$43 – $72
Medium split (5kW)	$0.35 – $0.55	$2.80 – $4.40	$84 – $132
Large split (7kW)	$0.50 – $0.75	$4.00 – $6.00	$120 – $180
Large split (9kW+)	$0.65 – $1.00	$5.20 – $8.00	$156 – $240
Ducted (small home)	$0.80 – $1.50	$6.40 – $12.00	$192 – $360
Ducted (large home)	$1.50 – $3.00	$12.00 – $24.00	$360 – $720
Portable unit	$0.40 – $0.70	$3.20 – $5.60	$96 – $168
Ceiling fan	$0.02 – $0.03	$0.16 – $0.24	$5 – $7

Costs based on Brisbane electricity rate of approximately 30c/kWh. Inverter systems run at lower wattage once the room reaches the set temperature.

What Affects Air Conditioning Running Costs?

1. Thermostat Setting

Every degree below 24°C in summer adds roughly 10 percent to running costs. Setting your air conditioner to 24-25°C is the sweet spot.

2. Inverter vs Non-Inverter

Inverter systems adjust compressor speed to match the cooling load, using 30 to 50 percent less electricity than older non-inverter (fixed-speed) systems that constantly cycle on and off.

3. System Size vs Room Size

An undersized AC runs constantly. An oversized AC short-cycles. Both waste energy. Correct sizing is critical for efficiency.

4. Insulation and Sealing

Poorly insulated homes and air leaks around doors, windows and ceiling penetrations force the AC to work much harder. Improving insulation and sealing gaps can reduce cooling costs by 10 to 20 percent.

5. Maintenance

Dirty filters, blocked outdoor units and low refrigerant all reduce efficiency and increase running costs. Clean filters every 4 to 6 weeks and service annually.

How to Reduce Air Conditioning Costs

Set thermostat to 24-25°C in summer
Use ceiling fans alongside AC to create wind-chill effect
Use zone control on ducted systems — only cool occupied rooms
Clean filters regularly
Upgrade old non-inverter systems to modern inverter models
Use timers — do not cool empty rooms
Install surge protection to protect the compressor from power surges

Air Conditioning Installation Costs

System	Supply + Install (AUD)
Small split (2.5-3.5kW)	$1,800 – $3,000
Medium split (5-7kW)	$2,500 – $4,500
Large split (7kW+)	$3,500 – $5,500
Multi-head split	$4,500 – $9,000+
Ducted system	$8,000 – $18,000+
Electrical circuit for AC	$250 – $500
Switchboard upgrade (if needed)	$800 – $3,500

All air conditioning installations require a dedicated electrical circuit and isolator switch. If your switchboard is full, an upgrade may be required. Connex Electrical handles the full electrical side of AC installation.

Areas We Service Across Brisbane and North Brisbane

Connex Electrical provides expert electrical services across Brisbane and North Brisbane, including:

Our Full Range of Electrical Services

Need AC Electrical Work?

Connex Electrical installs dedicated AC circuits, switchboard upgrades and surge protection for air conditioning systems across North Brisbane.

Call 0474 207 609 or visit our contact page to book.

Frequently Asked Questions

How much does it cost to run a split system per hour?

A medium 5kW split system costs approximately $0.35 to $0.55 per hour at Brisbane electricity rates.

Is ducted air conditioning expensive to run?

Ducted systems cost $0.80 to $3.00 per hour depending on home size. Zone control significantly reduces costs by only cooling occupied rooms.

Do ceiling fans reduce air conditioning costs?

Yes. Ceiling fans cost 2 to 3 cents per hour and let you raise the AC thermostat 2-3 degrees, saving 20 to 30 percent on AC running costs.

How much electricity does a portable air conditioner use?

Portable AC units cost $0.40 to $0.70 per hour. They are less efficient than split systems and best used as a temporary solution.

Do I need an electrician for air conditioning installation?

Yes. All AC installations require a dedicated electrical circuit, isolator switch and potentially a switchboard upgrade.