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SeasonalOctober 15, 202514 min read

Summer Electrical Prep: Air Con Season Guide 2025

Summer heat puts serious strain on your electrical system. Before the temperatures soar, make sure your air conditioning and electrical infrastructure can handle the load safely and efficiently.

Why Summer Electrical Prep Matters

  • • Air conditioning can double your electricity usage
  • • Peak demand often reveals underlying electrical issues
  • • Electrical faults cause more fires in summer than winter
  • • Blackouts more likely during heatwaves
  • • Emergency electrician callouts surge (and so do prices)

Air Conditioning Electrical Requirements

Power Requirements by System Type

System TypeTypical PowerCircuit Required
Small split (2.5kW)6-8 ampsStandard 10A circuit
Medium split (5kW)10-12 ampsDedicated 15A circuit
Large split (7kW+)12-15+ ampsDedicated 20A circuit
Ducted system15-25+ ampsDedicated high-amp circuit

Warning: Circuit Overload Risk

Many homes have air conditioners plugged into standard power points on shared circuits. When the AC kicks in, it can overload the circuit—especially if other devices are running. Signs of trouble: lights dimming when AC starts, circuit breakers tripping, or warm power points.

Pre-Summer Electrical Checklist

Air Conditioner Preparation

Clean or replace indoor filters
Clear vegetation and debris from outdoor unit
Check condensate drain is clear
Inspect power connection for damage or corrosion
Test cooling mode before first hot day
Check circuit breaker in switchboard

Switchboard & Circuits

Test all RCDs (safety switches)
Check for any discoloured or warm breakers
Ensure AC circuit is properly labelled
Consider switchboard upgrade if old or overloaded

Ceiling Fans

Clean dust from blades (dust reduces efficiency)
Check wobble—tighten if needed
Ensure reverse function works (for winter use)
Set to rotate counter-clockwise for cooling effect

Reduce Your Summer Power Bills

Temperature Settings

  • • Set cooling to 24-25°C
  • • Each degree lower = 10% more power
  • • Use "eco" mode if available
  • • Avoid setting below 20°C—inefficient

Timing Strategies

  • • Use timers or smart controls
  • • Pre-cool house before peak heat
  • • Turn off when leaving home
  • • Close doors to unused rooms

Home Efficiency

  • • Close curtains during day
  • • Use outdoor blinds or awnings
  • • Seal gaps around doors/windows
  • • Improve insulation if possible

Fan Strategy

  • • Fans use 10% of AC power
  • • Use fans to delay AC use
  • • Fans cool people, not rooms
  • • Turn off fans in empty rooms

Signs You Need an Electrician Before Summer

Lights flicker when AC starts
Circuit breaker trips when AC runs
Power point feels warm
Burning smell from switchboard
AC taking longer to cool than usual
Unusual noises from electrical fittings

Don't wait for a breakdown in a heatwave. Call an electrician now if you notice any of these warning signs.

Preparing for Power Outages

Beat the Blackout

Know how to manually override electric garage doors/gates
Have battery-powered fans on hand
Keep torches/flashlights in known locations
Consider battery backup for essential medical equipment
Know your electricity distributor's outage number

Key Takeaways

  • Service air conditioners before the first hot day
  • Ensure dedicated circuits for large AC units
  • Set cooling to 24-25°C to save power
  • Use ceiling fans to reduce AC load
  • Call an electrician for flickering lights or tripping breakers
  • Book early—electricians get busy when heatwaves hit

Beat the Rush—Book Your Summer Check Now

Don't wait for the first heatwave to discover electrical issues. Our electricians can check your air conditioning circuits, test your switchboard, and ensure your system is ready for summer demand.

Find an Electrician

TPT Solutions

Keeping homes cool and safe