AC Running Cost Calculator India — 1.5 Ton 3★ vs 5★ Monthly Electricity Bill
Simulate real-world electricity costs for 1 Ton, 1.5 Ton, and 2 Ton Inverter ACs based on thermostat setting, ambient Indian summer heat, daily usage, and your DISCOM tariff rate.
Air Conditioner Specifications & Climate Inputs
120–180 sq ft (standard bedroom)
Inverters consume 30%–40% less power by throttling speed.
BEE recommends 24°C for peak thermal health & power savings.
Average night runtime is typically 7 to 9 hours.
Temperatures >38°C increase heat rejection work on condenser.
3-Star vs 5-Star Inverter AC: Is the Extra Price Worth It?
Lower initial purchase cost (~₹32,000–₹35,000), but burns more units annually in hot summer months.
Saves ₹5,700 every year on electricity bills. Recovers its ₹8,000 purchase premium in just ~1.4 years!
Frequently Asked Questions
Q:How much electricity does a 1.5 Ton Inverter AC consume per hour in India?
A 1.5 Ton 3-Star Inverter AC consumes approximately 1.0 to 1.3 units (kWh) per hour initially when cooling a hot room, and stabilizes to around 0.5 to 0.7 units per hour once the room reaches the set temperature (e.g. 24°C). Over an 8-hour night, it consumes approximately 5.5 to 7.0 units.
Q:Should I buy a 3-Star or 5-Star AC for home use?
If you use your air conditioner for more than 1,000 to 1,200 hours per year (around 5–6 hours daily for 6+ months), a 5-Star Inverter AC easily recovers its ₹7,000 to ₹8,000 price premium in roughly 2.5 to 3 years. After that, you earn pure savings of ₹3,000+ every single year for the remaining 7–10 year lifespan of the AC.
Q:Does room size affect AC electricity consumption?
Yes. Installing an undersized 1 Ton AC in a 180 sq ft room forces the compressor to run at 100% capacity continuously without cycling down, consuming more electricity than a properly sized 1.5 Ton Inverter AC that reaches temperature quickly and then runs at reduced modulated power.
Q:Why does changing the AC temperature from 20°C to 24°C save so much money?
Bureau of Energy Efficiency (BEE) and ASHRAE thermodynamic research shows that every 1°C increase in AC set temperature reduces compressor load by approximately 6%. Increasing the thermostat from 20°C to 24°C reduces electricity consumption by ~24%, saving an average Indian household ₹3,200 to ₹5,400 across summer months — with zero lifestyle compromise.
Q:What is ISEER rating and how does it differ from the old EER/COP rating for ACs?
ISEER (Indian Seasonal Energy Efficiency Ratio) is the BEE's India-specific efficiency metric for ACs, introduced in 2016. Unlike the older EER (measured at a single fixed test condition of 35°C outdoor / 27°C indoor), ISEER calculates weighted average performance across the range of Indian seasonal temperatures (20°C to 43°C outdoor). A higher ISEER means more cooling for less electricity. 5-Star ACs must achieve an ISEER of 4.50 or higher.
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