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Energy Savings Calculator

See how much electricity and money you save with a higher star AC, a warmer AC setting, LED bulbs or thermal curtains.

About this tool

Energy Savings Calculator

See how much electricity and money you save with a higher star AC, a warmer AC setting, LED bulbs or thermal curtains.

Pick the change, enter your usage and tariff and see yearly savings and payback. This page brings together 4 separate energy savings calculator pages (AC star rating, AC temperature, Thermal curtains, LED vs CFL bulbs) so you can compare them without hunting for the right one.

How to use Energy Savings Calculator

  1. 1

    Open Energy Savings Calculator on AltFTool — it loads instantly in your browser.

  2. 2

    Choose your upgrade at the top: AC star rating, AC temperature, Thermal curtains, LED vs CFL bulbs. On a phone it is a drop-down list.

  3. 3

    Fill in the energy savings calculator for that upgrade; each of the 4 options keeps its own rules, data and defaults.

  4. 4

    Read the result, then switch upgrade to compare. The page link keeps your upgrade (?v=ac-star-rating), so you can bookmark or share it.

Why use Energy Savings Calculator

  • All 4 in one place

    AC star rating, AC temperature, Thermal curtains and the rest sit behind one picker, so switching upgrade takes a tap instead of a new search.

  • Built for each option

    Every upgrade keeps its own rules, numbers and defaults rather than one generic template.

  • Shareable view

    The link remembers the upgrade you picked, so a bookmark or a shared link opens straight on it.

Common use cases

  • You are standing in a showroom deciding whether a 5-star split at a few thousand rupees more than the 3-star model is worth it for the hours you actually run the AC
  • Settle a household argument about whether 24 °C really saves anything over 22 °C.
  • Comparing a ₹9,000 set of blackout curtains against a sheer net on three west-facing windows before buying
  • Costing a whole-house swap of twelve incandescent bulbs before deciding how many LEDs to buy at once

Frequently asked questions

Which upgrade options does this tool cover?

4: AC star rating, AC temperature, Thermal curtains, LED vs CFL bulbs. Pick one at the top of the tool; the page link updates (for example ?v=ac-star-rating) so you can bookmark or share that exact view.

What is ISEER and why does it matter more than the star count?

ISEER is the Indian Seasonal Energy Efficiency Ratio: the cooling delivered over a season divided by the electricity used, so a higher number means less power for the same cooling. Star bands are just ranges of ISEER, and BEE revises those thresholds every few years — which is why yesterday's 5-star can become today's 3-star, and why the printed ISEER is the number to compare.

How much electricity does raising the AC by 1 degree save?

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.

Do blackout curtains actually reduce cooling costs?

Yes, on a sunlit window. A blackout lined curtain has an interior attenuation coefficient of about 0.35, so it stops roughly 65% of the solar heat that gets through the glass — around 435 W on 2 sqm of single clear glazing in strong afternoon sun, which is about 120 kWh of electricity across a 150-day season at a COP of 3.2.

How much can I save by switching to LED bulbs?

Replacing twelve 60 W incandescent bulbs burning five hours a day with 9 W LEDs cuts lighting from about 1314 kWh a year to 197 kWh — roughly 8900 INR a year at 8 INR per kWh, with the LEDs paying for themselves in about two months.

Embed this tool on your site

Add the Energy Savings Calculator widget to your blog or website — free, responsive, no signup. Just keep the “Widget by AltFTool” credit link visible.

<iframe src="https://www.altftool.com/embed/widget/energy-savings-calculator"
  title="Energy Savings Calculator — free AltFTool widget"
  width="100%" height="640" style="border:0;border-radius:12px;overflow:hidden"
  loading="lazy" referrerpolicy="no-referrer-when-downgrade" allow="clipboard-write"></iframe>
<p style="font-size:12px;margin:4px 0 0">Widget by <a href="https://www.altftool.com/tools/all/energy-savings-calculator?utm_source=embed&amp;utm_medium=widget" rel="nofollow">AltFTool — free online tools</a></p>

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