AC Installation & Service Cost Calculator India

The right standard number for a home AC — and the one that isn't

Room air conditioners sold in India carry a mandatory BEE star label under section 14(a) of the Energy Conservation Act, 2001, administered by the Ministry of Power in consultation with the Bureau of Energy Efficiency. The gazette notification governing that label states the reference standard as "IS1391 (Part I and Part II) with all amendments" for Room Air Conditioners — the standard split and window units installed in most Indian homes.

A separate BEE document, Schedule 24 for Light Commercial Air Conditioners, covers a different capacity band entirely — units above 10.5 kW up to 18 kW cooling capacity, the kind found in server rooms and shop floors, not the 1–2 ton (roughly 3.5–7 kW) splits and windows sold for a bedroom or living room. If a quote or an article cites a specific ISEER star band for a home AC, check which schedule it's actually citing: Schedule 24's own voluntary-phase band (1-Star 2.70–3.09, up to 5-Star ≥4.00 ISEER) was valid only from 2 March 2020 to 31 December 2022 and applies to light-commercial units, not the split AC in your living room.

One rule genuinely does apply across the room-AC labelling programme: BEE requires that "all star labelled room air conditioners manufactured, imported, commercially purchased or sold in India, shall have a default setting of 24°C without any manual intervention". That default is set at the factory, not by your technician during installation — if your unit starts up at a different temperature every time, that is a remote-setting or firmware behaviour, not a compliance failure your installer can fix.

ISEER — the Indian Seasonal Energy Efficiency Ratio — is the ratio of total annual heat removed to total annual energy consumed, measured across a bin temperature range of 24–43°C at 1,600 assumed operating hours a year. It is the number behind every star rating, but the current numeric thresholds for a standard residential split AC were not published in a form this registry could verify: the label-validity period BEE last confirmed by gazette amendment for Room ACs — 1 July 2022 to 31 December 2024 — has since expired, and no updated 2025/2026 residential star-band table was found. Read the actual sticker on the unit in the shop; do not rely on a cached ISEER number from an old article.

The label's validity dates have themselves moved three times by gazette amendment, which is worth knowing if a dealer tells you a rating is "about to expire" as a sales tactic: the original notification S.O. 2528(E) (8 August 2017) set two validity bands; an amendment S.O. 4485(E) (10 December 2020) adjusted them; and a further amendment S.O. 4634(E) (10 November 2021) set the bands actually in force before this registry's retrieval date — 1 January 2018 to 30 June 2022 for one, 1 July 2022 to 31 December 2024 for the next. Both are now expired, which is a separate fact from whether your specific unit's cooling performance has degraded.

What the label proves, and what it doesn't

The star label is a statement about the unit as manufactured — tested and registered against IS 1391 before it left the factory. It says nothing about whether the technician who installs it gets the vacuum and pipe-run right, and a badly installed 5-star unit can run less efficiently than a well-installed 3-star one. Brand-authorised AMC and independent technicians are both working on the same labelled hardware; the label is not a way to verify installation quality, only unit efficiency at the point of manufacture.

What the September 2025 GST reform changed on AC purchase — and what it didn't

The GST Council's 56th meeting cut "Air-conditioning machines, comprising a motor-driven fan and elements for changing the temperature and humidity" (HS 8415) from 28% to 18%. Cement used in the same reform round also moved from 28% to 18%, part of the same September 2025 rationalisation.

The legal instrument is Notification No. 9/2025-Central Tax (Rate), dated 17 September 2025, which supersedes the earlier Notification No. 1/2017-Central Tax (Rate) — the number and date to check for if you want to verify a dealer's invoice against the official rate change yourself.

What the cut is worth on an actual purchase, worked step by step from the sourced rate change: a 1.5-ton split AC listed at ₹30,000 before tax attracted ₹8,400 GST at the old 28% rate, for a total of ₹38,400. At the current 18% rate the same ₹30,000 unit attracts ₹5,400 GST, for a total of ₹35,400 — a saving of ₹3,000 on this one unit, purely from the rate change and before any dealer discount. Scale the same 28%-to-18% arithmetic to whatever pre-tax price your dealer quotes.

Worked example: what running an AC actually adds to a Mumbai power bill

Running cost is the piece no installer's quote covers, and it depends entirely on your local tariff slab. Tata Power's distribution licence for Mumbai publishes its residential (LT I(B)) rates for FY2025-26: ₹2.00/kWh energy charge plus ₹2.76/kWh wheeling charge for the first 100 units (fixed charge ₹90/month), rising to ₹5.20 + ₹2.76 for 100–300 units, ₹10.79 + ₹2.76 for 301–500 units, and ₹11.79 + ₹2.76 above 500 units.

The arithmetic that matters: this is a slabbed tariff, so the units your AC adds are priced at whatever slab your total monthly consumption reaches, not at the average rate on your bill. A household already near the top of the 100–300 unit slab that adds, say, 150 units a month of AC running in peak summer pushes most of that additional load into the ₹13.55/unit slab rather than the ₹7.96 one — nearly double the marginal cost the household may be expecting. That 150-unit figure is an illustration to show how the slab structure bites, not a claimed AC consumption figure; check your own meter reading before and after switching the AC on regularly to see where you actually land.

This table is Mumbai and Tata Power-D specific. Maharashtra alone has multiple discoms — MSEDCL, BEST and Adani Electricity — each with its own MERC-approved tariff, and every other state has its own regulator entirely. Do not use these ₹/unit figures for a Bengaluru, Delhi or Chennai household; check your own DISCOM's published tariff order instead.