AC Electricity Cost for 20 Hours Per Day
in India (2026)
undefined. Calculate exact monthly and annual cost for every tonnage and star rating.
Quick Answer
₹4,410
Monthly Cost
630
Units/Month
₹7
Per Unit Rate
Running a 1.5-ton 5-star inverter AC for 20 hours per day costs approximately ₹4,410 per month at India's average electricity rate of ₹7/unit. Over a 6-month summer season, that's ₹26,460. A 3-star AC would cost ₹6,300/month — ₹1,890 more.
AC Electricity Cost Calculator
₹7.3
Per Hour
₹4,410
Monthly
630
Units/Month
AC Cost Breakdown at 20 Hours/Day
Factors Affecting Your AC Electricity Cost
Star Rating: 5-star ACs consume ~43% less than 3-star models. At 20 hrs/day, monthly savings are ₹1,890.
Electricity Rate: India's average rate is ₹7/unit, but it ranges from ₹5.5 (Assam) to ₹8.5 (Maharashtra). Check your state's rate for exact costs.
Tonnage: Correct sizing matters. An oversized AC short-cycles and wastes 20–30% energy. A 1.5-ton AC covers 150–200 sq ft.
Temperature Setting: Each degree above 18°C saves ~6%. At 20 hrs/day, setting 26°C vs 18°C saves ₹1,588/month.
Room Insulation: Sealed rooms with thermal curtains reduce AC load by 15–20%, saving ₹772/month.
AC Maintenance: Dirty filters increase consumption by 10–15%. Regular servicing saves ₹551/month.
How to Reduce Your AC Electricity Bill
At 20 hrs/day, only a 5-star inverter AC makes financial sense. Monthly savings vs 3-star: ₹1,400–2,000. Annual: ₹16,000–24,000.
Set AC to 24–26°C — at 20 hrs/day, each degree above 18°C saves ~6%, meaning 26°C vs 18°C saves ~48%.
Use ceiling fan alongside AC — allows 2°C higher setpoint with same comfort, saving 12–14%.
Enable timer/sleep mode — auto-shutoff during cooler hours prevents unnecessary runtime.
Service AC filters every 3 months — dirty filters increase consumption by 10–15%.
Seal room gaps and use thermal curtains — reduces AC load by 15–20%.
Best ACs to Save Electricity
Daikin 1.5 Ton 5-Star Inverter
Save ₹650/month vs 3★
Voltas 1.5 Ton 5-Star Inverter
Save ₹580/month vs 3★
LG 1.5 Ton 5-Star AI Inverter
Save ₹560/month vs 3★
Find the Most Energy-Efficient AC for Your Usage
We compared 50+ models across ISEER, star rating, and real electricity cost. See the top picks that save ₹7,000+ per year on your bill.
See Best Energy-Efficient 1.5T ACs 2026Related Guides & Calculators
Frequently Asked Questions
AC Electricity Cost for 20 Hours Per Day — Full Guide
Running your AC for 20 hours per day is heavy usage by Indian standards. 20 hours per day is essentially continuous usage with brief breaks. Found in hospitals, nursing homes, and homes with critical temperature needs. At India's average electricity rate of ₹7/unit, a 1.5-ton 5-star inverter AC running 20 hours daily costs approximately ₹4,410 per month. Over a 6-month AC season, the total cost is ₹26,460.
Star rating is the single most important factor at 20 hours/day usage. A 5-star inverter AC saves ₹1,890 per month compared to a 3-star non-inverter model. Over one full year, that saving adds up to ₹11,340 — easily covering the premium cost of a 5-star model within 12–18 years.
Tonnage also matters significantly at 20 hours/day. A correctly-sized 1.5-ton AC for a 150 sq ft room will operate efficiently at partial load. An oversized AC short-cycles, running at full power each startup and consuming 20–30% more electricity than a correctly-sized inverter model running continuously at reduced speed.
State electricity rates create large regional differences. At 20 hours/day, the same 1.5-ton 5-star AC costs ₹3,465/month in Assam (₹5.5/unit) vs ₹5,355/month in Maharashtra (₹8.5/unit).
₹4,410
1.5T 5★ Monthly (20h)
₹1,890
3★ vs 5★ Saving/month
21.0 kWh
Units/Day (1.5T 5★)
Year-round
Peak Season
- Set AC to 24–26°C — at 20 hrs/day, every degree above 18°C saves ~6%.
- Use ceiling fan alongside AC — allows 2°C higher setpoint, saving 12–14%.
- Enable timer/sleep mode — auto-shutoff during cooler hours.
- Service AC filters every 3 months — at high daily usage, filters clog faster.
- Seal room gaps — reduces AC load by 15–20%.
Looking for the most energy-efficient 1.5 Ton AC?
We compared 50+ models across ISEER, star rating, and real electricity cost. See the top picks that save ₹7,000+ per year on your bill.
See Best Energy-Efficient 1.5T ACs 2026 →