How to Reduce Your Air Conditioning Running Costs

Air conditioning is one of the biggest drivers of a summer power bill, but the amount you pay is far more in your control than most people think. The type of system matters less than how you run it. Here are the changes that genuinely reduce your running costs — no gimmicks.

Quick answer: The biggest levers on air conditioning running costs are smart temperature settings (every degree you push against the outside temperature costs more), zoning so you only cool occupied rooms, regular servicing so the system runs efficiently, sealing the room against heat gain, and running a correctly sized, efficient reverse-cycle system. Cooling a living area costs roughly $2–$10 per day; how you use the system decides where you land in that range.

Set the temperature sensibly

This is the single most effective habit. An air conditioner's running cost is driven by how hard it has to work against the outside temperature — the bigger the gap, the more energy it burns. Every degree matters. In summer, choosing a comfortable moderate setting rather than blasting the coldest possible temperature noticeably cuts your bill, because each degree lower ramps up energy use. In winter, the same logic applies in reverse.

You don't have to be uncomfortable — just avoid extremes. Pairing the system with ceiling fans helps too, letting you feel comfortable at a milder setting.

Only cool the rooms you're using

Cooling empty space is pure waste. For ducted systems, zoning is the key — condition the living area during the day and the bedrooms at night, never the whole house at once. Running an unzoned ducted system that cools rooms nobody's in is the most expensive way to use air conditioning, full stop. For split systems, the same principle is built in: you're only ever cooling the room the unit is in.

Keep the system serviced

A neglected air conditioner is an expensive one. As filters clog and coils foul, the system works harder for the same result, quietly inflating every bill. Regular servicing — and cleaning the filter yourself every few months — keeps it running at peak efficiency. This is one of the cheapest ways to lower your running costs.

Seal the room against heat

You can't cool a room efficiently if the heat keeps pouring back in. Close doors and windows so you're not cooling the outdoors. Draw blinds or curtains against direct sun, especially on west-facing rooms that cop the brutal Western Sydney afternoon sun — that radiant heat can force the system to work far harder than it should. Good insulation and draught-sealing make a lasting difference.

Right-size and choose efficient

Two foundational choices set your baseline running cost. A correctly sized system runs efficiently; an undersized one strains and an oversized one short-cycles, both wasting energy. And a high-efficiency reverse-cycle unit — ideally 3+ energy stars, more if you can — costs less to run every hour it operates. When comparing two units of the same capacity and star rating, the one with the lower annual energy use (kWh) is cheaper to run.

Know what you're actually spending

For context, cooling a single living area typically costs around $2–$10 per day, while a whole-home ducted system can run $6–$25+ per day — the spread depends on hours, settings, efficiency and your tariff. The gap between the low and high end of those ranges is almost entirely about the habits above.

Small changes, real savings

None of this requires suffering through the heat — it's about running the system smartly rather than wastefully. Combine sensible settings, zoning, servicing and a well-sealed room, and you'll feel it on the bill without feeling it in the house.

Want a system that's efficient from the ground up, or a service to get your current one running leaner? Contact BES across Hoxton Park and South West Sydney.