As another sweltering British summer tests the nation's resolve, a common household dilemma returns: is it more efficient to leave your air conditioning unit running constantly or to turn it off when you're out?
The answer, according to energy experts, might defy conventional wisdom. Leaving your AC on a low, consistent setting could actually be more cost-effective and efficient than the stop-start approach of turning it on and off throughout the day.
The Science Behind Consistent Cooling
Air conditioning units consume the most energy when they start up and work hardest to rapidly cool a hot room. By maintaining a steady, moderate temperature, the system operates more efficiently and avoids these energy-intensive spikes.
"Think of it like driving a car," explains energy consultant Sarah Wilkinson. "Constant speed on the motorway uses less fuel than constant stopping and starting in city traffic. Your AC works on the same principle."
The Optimal UK Summer Setting
For British homes during typical summer weather, experts recommend setting your thermostat to around 24-25°C (75-77°F) when you're at home. When away, increasing this to 27-28°C (80-82°F) maintains efficiency without working the system unnecessarily.
This approach prevents your home from becoming an oven that requires enormous energy to cool down upon your return.
Smart Controls: The Modern Solution
Modern smart thermostats and programmable AC systems offer the perfect compromise. They allow you to:
- Maintain a base temperature throughout the day
- Pre-cool your home before you return
- Adjust settings remotely based on weather changes
- Monitor energy consumption in real-time
These technologies effectively eliminate the guesswork while optimising both comfort and cost.
Additional Energy-Saving Tips
Beyond your AC settings, several strategies can enhance cooling efficiency:
- Close curtains and blinds during the hottest parts of the day to block solar gain
- Use ceiling fans to circulate cool air more effectively
- Ensure regular maintenance of your AC unit, including cleaning filters
- Seal windows and doors to prevent cool air from escaping
As energy prices remain high and British summers grow warmer, understanding how to optimise your air conditioning isn't just about comfort—it's about managing household budgets intelligently while staying cool during Britain's increasingly warm summers.
