AC Cost Guide Kolkata (West Bengal) 2026
Quick Answer
A 1.5 ton 5-star inverter AC running 8 hours daily in Kolkata costs approximately ₹1000 per month at ₹8/kWh. A 3-star unit costs ₹1380. The hot & humid climate and high (70–85%) humidity directly affect your actual consumption.
Monthly & Yearly AC Electricity Bill in Kolkata
Estimates assume 8 hours of daily AC usage during peak months. Actual bills vary by room size, insulation, set temperature, and usage days.
| AC Type | 1 Ton | 1.5 Ton | 2 Ton |
|---|---|---|---|
| 5-Star Inverter | ₹620/mo | ₹1000/mo | ₹1420/mo |
| 3-Star Non-Inverter | ₹840/mo | ₹1380/mo | ₹1940/mo |
| Yearly Savings (5-Star vs 3-Star) | ₹2640 | ₹4560 | ₹6240 |
Rates based on Kolkata residential tariff of ₹8/kWh. BEE laboratory estimates adjusted for local climate conditions.
West Bengal Electricity Tariff for AC Usage
Kolkata's residential electricity tariff is ₹8 per kWh. This is higher than the Indian national average of ₹7.5/kWh.
ACs typically run on higher residential slabs. If your total monthly consumption pushes you into a higher tariff slab, your per-unit rate may increase. Most households in Kolkata fall into the ₹8/kWh slab during summer months.
The table above shows what different tonnage and star ratings cost at this tariff. These are laboratory-estimate based figures adjusted for Kolkata's actual climate conditions.
Tariff rates are subject to change by West Bengal electricity boards. Check your latest bill for your exact per-kWh rate.
Best AC Type for Kolkata Climate
For Kolkata's hot & humid climate, 5-Star Inverter Split AC and Strong Dry Mode are the top priorities. Anti-Corrosion Coating adds further protection, while carrier or blue star ensures year-round reliability.
For most Kolkata households, a 1.5 ton 5-star inverter split AC is the recommended choice — it balances cooling performance, electricity savings, and long-term durability in hot & humid conditions.
Recommended AC Tonnage for Kolkata
Room size is the primary factor, but Kolkata's climate adds important considerations:
Recommendation:
1.5 ton for 140–160 sq ft
- Room size: 100–130 sq ft → 1 ton | 130–170 sq ft → 1.5 ton | 170–220 sq ft → 2 ton
- Ceiling height above 10 feet adds 0.3–0.5 ton effective load
- West-facing rooms and top floors need 0.3–0.5 ton extra in Kolkata
- High humidity in Kolkata means the AC works on dehumidification alongside cooling — slightly higher tonnage helps
- Multiple heat sources (computers, appliances, glass windows) each add ~0.1 ton equivalent
Real-World AC Usage Insights for Kolkata
Kolkata's peak AC season runs April – October. This extended season means year-round efficiency gains compound significantly.
Households typically run ACs 6–10 hours daily during April – October. Families with elderly members or infants often run them 12+ hours, pushing monthly bills 30–50% above the 8-hour baseline.
Set temperature matters enormously. Running at 24°C instead of 18°C saves 18–22% electricity in Kolkata's conditions. Every 1°C increase above 24°C saves roughly 3–5% more.
HVAC technician observation: In Kolkata, the most common mistake is undersizing the AC for the room + climate combination. A 1.5 ton unit in a 170 sq ft west-facing room during April – October will run continuously, never reach the set temperature, and consume more power than a properly sized 2-ton unit would.
AC Service & Repair Cost in Kolkata
Local labor rates and technician availability affect actual costs. Prices below are based on current market rates in Kolkata.
₹380–₹600
Filter cleaning, gas check, coil inspection
₹750–₹1300
Chemical wash, full coil service
₹1600–₹3000
Includes leak detection & vacuum
₹2000–₹4500
Inverter board or display replacement
₹7000–₹15000
Repair or replacement estimate
Frequently Asked Questions — AC in Kolkata
How much does AC cost per month in Kolkata?
A 1.5 ton 5-star inverter AC running 8 hours daily in Kolkata costs approximately ₹1000 per month at ₹8/kWh. A 3-star unit costs ₹1380. For a 1-ton unit, expect ₹620 (5-star) or ₹840 (3-star).
Which AC star rating is best for Kolkata?
Given Kolkata's ₹8/kWh tariff and April – October season, a 5-star inverter AC is optimal. It saves ₹380 per month versus 3-star. Over the season, savings pay back the premium within 14–20 months.
How many units does a 1.5 ton AC consume per hour in Kolkata?
A 5-star inverter 1.5 ton AC consumes 0.8–1.1 kWh per hour. A 3-star non-inverter uses 1.3–1.6 kWh per hour. High humidity in Kolkata adds 10–15% to these figures.
Is inverter AC worth it in Kolkata?
Yes. Inverter ACs save 30–40% electricity versus non-inverter models. At ₹8/kWh in Kolkata, a 1.5 ton inverter saves ₹304–₹456 per month. The premium pays back within 18–24 months.
Which AC is best for Kolkata climate?
Kolkata's hot & humid climate demands 5-Star Inverter Split AC, Strong Dry Mode, Anti-Corrosion Coating. Strong dehumidification is essential for High (70–85%) conditions. A 1.5 ton 5-star inverter from Carrier or Blue Star is recommended.
Does Kolkata humidity affect AC performance?
Yes. Kolkata's high (70–85%) forces continuous dehumidification, increasing power use by 15–20% and reducing cooling speed by 10%. Models with strong dry modes handle this better.
What is AC service cost in Kolkata?
General AC service in Kolkata costs ₹380–₹600. Deep cleaning is ₹750–₹1300. Gas refill costs ₹1600–₹3000. PCB repair ranges ₹2000–₹4500, and compressor issues cost ₹7000–₹15000.
How much does AC gas refill cost in Kolkata?
R32 gas refill in Kolkata costs ₹1600–₹3000 for a 1.5-ton split AC. R410A costs 10–15% more. Prices include technician visit, leak detection, and vacuum pumping before refilling.
Related Calculators & Guides for Kolkata
Electricity Cost Calculator
₹8/kWh tariff — calculate your exact bill
Service & Repair Costs
₹380–₹600 for general service
Installation Charges
Split AC fitting ₹1400–₹2200
AC Bill Calculator
Free tool with Kolkata tariff pre-filled
Best 1.5 Ton AC
Top picks for Kolkata's hot & humid climate
Inverter vs Non-Inverter
Which saves more in Kolkata
5-Star vs 3-Star
Star rating payback for ₹8/kWh
AC Electricity Guide
How AC units consume power in Indian climates
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