How much does a 1.5 ton AC cost per month in India?

A 1.5 ton 3-star AC costs approximately ₹2,520–₹3,600 per month running 8 hours daily, depending on your state electricity rate. A 5-star inverter model costs ₹1,728–₹2,508 per month — saving ₹800–₹1,100 monthly.

How much electricity does a 1.5 ton AC use per month?

A 1.5 ton 5-star inverter AC uses approximately 252–300 units (kWh) per month when run for 8 hours daily. A 3-star model uses 360–400 units per month. At ₹7 per unit, this costs ₹1,764–₹2,800 monthly.

Does inverter AC really save electricity?

Yes. Inverter ACs save 30–50% electricity compared to non-inverter (fixed-speed) models. The variable-speed compressor adjusts output based on room temperature, avoiding the constant on/off cycling that wastes power in fixed-speed units.

What is the best temperature to set AC to save electricity in India?

The Bureau of Energy Efficiency (BEE) recommends 24°C as the default AC temperature. Each degree below 24°C increases electricity consumption by 6–8%. Setting 24°C instead of 18°C can save up to 36% on your monthly AC electricity bill.

Which state has the cheapest electricity rate for AC in India?

As of 2026, Goa, Himachal Pradesh and Uttarakhand have among the lowest residential electricity rates in India (₹3.80–₹5.00 per unit). Maharashtra and Andhra Pradesh have among the highest rates at ₹8.50–₹12.40 per unit for higher consumption slabs.

Is a 5-star AC worth the extra cost in India?

Yes, for most Indian households. A 5-star inverter AC saves ₹800–₹1,200 per month versus a 3-star model. At ₹10,000–₹15,000 higher upfront cost, the payback period is typically 12–18 months, after which you enjoy net savings for the remaining 8–10 year AC lifespan.

What tonnage AC do I need for my room?

For rooms up to 120 sq ft: 1 ton AC. For 120–180 sq ft: 1.5 ton AC. For 180–240 sq ft: 2 ton AC. Adjust upward if the room is on the top floor, faces west, has large windows, or has more than 2 occupants. Use our free AC Tonnage Calculator for a precise recommendation.

How accurate is the AC bill calculator?

Our calculator uses BEE 2026 ISEER data, real state-wise DISCOM tariff slabs, inverter duty-cycle modelling, and outdoor temperature correction factors. This gives approximately 90–97% real-world accuracy — significantly more accurate than basic watt × hours × flat rate calculators.

Which AC is best for Patna?

The best AC for Patna depends on its Humid Subtropical climate. Top pick: Panasonic CS/CU-SU18XKYW. Value pick: LG RS-Q18YNZE. Must-have features include: HEPA / PM2.5 filter; High ambient (48°C+); Hot & Cold.

What tonnage AC do I need in Patna?

Add 15% for heat + humidity For most 120–150 sq ft rooms in Patna, a 1.5-ton AC is the standard choice.

How much does it cost to run an AC in Patna?

Running a 1.5-ton 5-star inverter AC for 13 hours/day in Patna costs approximately ₹2,457/month. A 3-star model costs ₹3,510/month.

Patna · Bihar · composite climate

Best AC for Patna
2026 Climate Guide

Don't buy the wrong AC for Patna's Humid Subtropical climate. Expert picks, must-have features, and real monthly cost estimates at ₹6/unit.

Patna Climate Guide

Expert Picks 2026

₹6/unit rate

42°C peak summer

See Top Picks Calculate Cost in Patna

₹6

Per Unit

Bihar tariff

42°C

Peak Summer

Humid Subtropical

13h

Avg Usage

Daily peak season

₹12,636

Yearly Savings

5★ vs 3★ 1.5T

Patna Climate Profile

Patna has extremely hot and humid summers — 44°C+ with high humidity. ACs run 12–14 hrs/day. Power cuts are common; inverter ACs with wide voltage range (130V–290V) are essential.

Climate: Humid SubtropicalPeak Season: May – JulyAvg Usage: 13 hrs/dayElectricity Rate: ₹6/unit

Must-Have Features for Patna

HEPA / PM2.5 filter

High ambient (48°C+)

Hot & Cold

Avoid in Patna

Models without air purification

Standard 43°C models

Top Pick

Panasonic CS/CU-SU18XKYW

Best overall choice for Patna's climate. Designed specifically for Humid Subtropical conditions.

Value Pick

LG RS-Q18YNZE

Best bang-for-buck option for Patna residents who want reliable cooling without overspending.

Monthly AC Cost in Patna: 3-Star vs 5-Star

Tonnage

3-Star Cost

5-Star Cost

1.0T₹2,340₹1,638Save ₹702

1.2T₹2,808₹1,966Save ₹842

1.5T₹3,510₹2,457Save ₹1,053

2.0T₹4,680₹3,276Save ₹1,404

Based on 13 hrs/day · ₹6/unit (Patna) · Split AC

Expert Tip for Patna

Patna consistently ranks among India's most polluted cities. An AC with nanoe-X or HEPA filtration is a genuine health investment here.

Composite / Mixed Climate Zone

Hot summers + cold winters — all-season inverter wins

Other cities in this zone:

HyderabadLucknowChandigarhBhopalIndoreKanpur

Patna Quick Facts

StateBihar

ClimateHumid Subtropical

Peak Temp42°C

Peak SeasonMay – July

Avg AC Usage13 hrs/day

Electricity Rate₹6/unit

MaintenanceEvery 6 weeks

Top Saving Tip

Patna's frequent power cuts mean inverter ACs with wide voltage tolerance are critical. They restart smoothly after cuts without compressor damage.

Tonnage Note

Add 15% for heat + humidity

Calculate Your Tonnage →

Patna Calculators

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Best AC for Patna2026 Climate Guide