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About this tool
See the units and rupees saved for every degree you raise the AC thermostat, with a full setpoint table from 18 to 30 °C.
This simulator shows the electricity and money a higher AC setpoint saves, using the fact that heat leaks into a room in proportion to the temperature difference across its envelope: the energy ratio is (outdoor − new setpoint) ÷ (outdoor − old setpoint). On a 38 °C day, moving from 22 °C to 24 °C gives 14/16, a 12.5% cut — about 6.25% per degree, which is why BEE's 24 °C default-setting advisory quotes roughly 6% saved per degree. Both the model figure and the published rule of thumb are shown, with a full table from 16 to 30 °C.
Open AC Temperature Savings Simulator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Uses the temperature-difference load relationship and prints the per-degree figure it produces.
Shows the official 6%-per-degree rule of thumb next to the model result.
Every setpoint from 16 to 30 °C priced at your tariff and run hours in one scrollable table.
Roughly 6% per degree, which is the figure BEE cites for its 24 °C default-setting advisory. The exact number depends on how hot it is outside: at 38 °C outdoors, going 22 °C to 24 °C is a 12.5% cut, or 6.25% per degree, because the cooling load falls from a 16 °C gap to a 14 °C gap.
BEE mandated 24 °C as the factory default temperature setting for room air conditioners sold in India, on the reasoning that most people are comfortable there and each degree lower costs around 6% more energy. The setting is a default, not a lock — you can still change it, but the unit starts at 24 °C.
No. A thermostat is a target, not a throttle: the compressor runs at the same capacity whether you set 16 °C or 24 °C, so the room cools at the same rate until it reaches the setpoint. Setting 16 °C only means the compressor keeps running past the point you were comfortable.
Treat it as an estimate of the sensible cooling load. Real savings tend to be slightly larger because a higher evaporating temperature also raises compressor efficiency, and slightly smaller on humid days when the machine spends energy condensing moisture. Sun on the walls, how many people are in the room and how well it is sealed all move the figure.
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