The Best AC Temperature Setting to Stay Cool and Save on Bills
The Bureau of Energy Efficiency (BEE) in India recommends setting your AC to 24°C as the ideal balance between comfort and energy efficiency. Every degree you lower the thermostat below 24°C increases electricity consumption by approximately 6%. This guide explains the best settings and the habits that waste the most power.
The Recommended AC Temperature for India
- 24°C — BEE’s recommended setting; comfortable for most people and energy-efficient
- 25–26°C — slightly warmer but uses noticeably less electricity; good for nights
- 18–20°C — very cold setting; increases electricity use by 25–35% vs 24°C
Thermal comfort depends on humidity and airflow, not just temperature. At 24°C with medium fan speed, most people feel just as comfortable as at 20°C with low fan speed — at a fraction of the electricity cost.
AC Settings That Waste the Most Electricity
- Setting the temperature below 20°C — the compressor runs almost continuously
- Cooling with windows or doors open — warm air constantly replaces cool air
- Lowest fan speed in a hot room — slow air circulation reduces heat absorption efficiency
- Not using sleep mode or timer — AC runs at full power all night unnecessarily
- Ignoring the dirty filter — a clogged filter makes the AC work much harder for the same output
How to Set Your AC to Save Maximum Electricity
Step 1: Set the Temperature to 24°C
24°C is the sweet spot. Use this as your starting point. If you feel too warm, drop to 23°C — but try 24°C for a week before deciding it is too warm. Your body adjusts to slightly higher temperatures over a few days.
Step 2: Use Auto or Medium Fan Speed
Auto fan speed lets the AC adjust airflow based on how far the room temperature is from the set point — efficient and comfortable. Avoid the lowest fan setting in hot weather; it reduces the rate at which the coil absorbs heat from the room air.
Step 3: Enable Sleep Mode at Night
Sleep mode gradually raises the temperature by 1°C every hour (the exact behaviour varies by brand) as your body temperature drops during sleep. It typically saves 10–15% on overnight electricity use. Most ACs have this on the remote — look for a moon icon or “Sleep” button.
Step 4: Use the Timer
Set the AC to turn off 30 minutes before you wake up or leave the room. A well-insulated room stays cool for 20–30 minutes after the AC stops, so you will not notice a difference in comfort.
Step 5: Keep the Room Well-Sealed
Close all doors, windows, and gaps. Use thick curtains or blinds on sun-facing windows. The AC only has to cool the air inside — every degree of heat that enters through gaps adds to your electricity bill.
Quick Electricity Savings Comparison
| Setting | Approximate Extra Cost vs 24°C |
|---|---|
| 18°C | ~36% higher electricity use |
| 20°C | ~24% higher electricity use |
| 22°C | ~12% higher electricity use |
| 24°C | Baseline (most efficient comfort setting) |
| 26°C | ~12% lower electricity use |
Also see: Sell Your Old AC in Mumbai | Sell Your Old AC in Chennai