How Many Units Does an Air Cooler Use? (Wattage & Monthly Cost)

If you are wondering "cooler kitne watt ka hota hai?" (how many watts does an air cooler use?), the short answer is: between 70 Watts and 250 Watts depending on its size:

A very common myth among Indian consumers is turning off the water pump and running the cooler in "Fan Only" mode to save electricity. Let's look at the actual numbers:

The small submersible water pump in your cooler draws only 15 to 20 Watts. If you run the pump for 10 hours every day for a full month, it consumes only 4.5 to 6 units of electricity (less than ₹35 to ₹45 for the entire month!).

Turning off the water pump saves almost no noticeable money, but completely kills the cooling effect, turning your ₹6,000 cooler into a noisy fan. Keep the pump on—it is well worth the ₹1 per day.

If you are deciding whether to run an air cooler or an AC this summer, here is the direct monthly cost difference for 10 hours of daily use:

• Air Cooler (180W): Consumes ~54 units/month = ₹405 per month
• 1.5-Ton 5-Star AC (550W avg): Consumes ~165 units/month = ₹1,240 per month
• 1.5-Ton 3-Star Non-Inverter AC (1100W avg): Consumes ~330 units/month = ₹2,475 per month

Running an air cooler saves you over ₹800 to ₹2,000 every single month per room during the dry summer months of April, May, and June.

• Ensure Cross Ventilation: Unlike an AC which needs closed doors, an evaporative cooler pushes humid air. Keep a window or door partially open on the opposite side to let humid air escape.
• Upgrade to Honeycomb Pads: Honeycomb cooling pads retain water significantly better than traditional wood-wool (khus), delivering 2°C–3°C cooler air without using any extra electricity.
• Place the Cooler in the Shade: If possible, position window coolers away from direct blazing afternoon sunlight so the water tank stays naturally cool.