Cooler vs AC — running cost in Indian summer

Quick frame: A symphonic air cooler runs at ~150-200 W; a 1.5-ton 3-star AC runs at ~1,500 W. Over 10 hours a day for a 90-day Indian summer, that is the difference between ₹500/month and ₹4,000/month on your electricity bill.

Running cost math

For 8 hours/day usage at ₹8/kWh tariff:

Appliance	Power	Daily	Monthly	Summer (90 days)
Symphony Diet 22T cooler	170 W	1.4 kWh × ₹8 = ₹11	₹330	₹990
Pedestal fan	70 W	0.6 kWh = ₹4.5	₹135	₹405
1.5-ton 3⭐ non-inverter AC	1,550 W	12.4 kWh = ₹99	₹2,970	₹8,910
1.5-ton 5⭐ inverter AC	950 W (avg)	7.6 kWh = ₹61	₹1,830	₹5,490

Use the Cooler vs AC Tool — it factors in your tariff, hours, and unit choice.

When a cooler is enough

• Dry climates: Delhi, Jaipur, Lucknow, Ahmedabad, most of MP/Rajasthan
• Outdoor temperatures < 42°C
• Open-window setup (cooler needs cross ventilation to push humid air out)
• Single room target

When AC is necessary

• Coastal cities: Mumbai, Chennai, Kolkata, Goa (humidity > 60% makes coolers ineffective)
• Bedrooms in 30°C+ nights
• Closed offices / multi-room cooling
• Health (sleep apnoea, asthma — drier AC air helps)

Inverter vs non-inverter

Non-inverter ACs run at full power then shut off. Inverter ACs ramp down to maintain temperature, using 30-40% less over a 10-hour run. Cost difference: ~₹8,000-12,000 upfront. Pays back in 2-3 summers.

Hybrid: cooler + AC

In Delhi/NCR, run the cooler for the first 2-3 hours of evening (when outside drops to 35°C) then switch to AC at bedtime. Saves ~30% bill versus AC-only.

Buy criteria

• Cooler: Honeycomb pads (last 5 years vs cheap pads' 1 year), 3-speed pump, water-level indicator, ~50 L tank for 6+ hours backup
• AC: 5-star BEE rating, R-32 refrigerant, copper coil, 10-year compressor warranty, anti-bacterial filter

FAQ

Q: Does cooler raise humidity? A: Yes — that is its mechanism. In humid cities (Mumbai), this makes you feel hotter. Coolers are designed for dry-air zones.

Q: How much bigger AC for a hall vs bedroom? A: Rule of thumb: 1 ton per 100 sq ft (closed room, normal sun). 1.5 ton bedroom (~150 sq ft), 2 ton living room (~200 sq ft) typical for North India.

Q: Solar AC — worth it? A: With 3 kW rooftop solar (~₹1.5 lakh) you can offset 10-12 hours of inverter AC daily. Payback ~5 years if you already need solar; otherwise standalone solar AC products are still cost-prohibitive.