What It Actually Costs to Run an AC Per Hour in Pakistan
Between Rs 6 and Rs 79 an hour, depending on two things — and only one of them is your air conditioner. Here is the full calculation, and how to measure your own in thirty minutes.
"How much does it cost to run the AC for an hour" has no single answer in Pakistan, and the reason is the interesting part. Across realistic combinations of unit size and tariff slab, the honest range is roughly Rs 6 to Rs 79 an hour — a thirteen-fold spread.
Most of that spread is not the air conditioner. It is which tariff slab your household falls into. This article does the arithmetic for every combination, then shows you how to measure your own unit tonight, because your actual AC is the only one that matters.
The two numbers you need
The calculation itself is trivial:
Cost per hour = power draw in kilowatts × your per-unit tariff rate
Everything hard about this is getting the two inputs right.
Number 1 — your AC's actual power draw
Tonnage describes cooling capacity, not electricity consumption, and the relationship between the two depends on the unit's efficiency. As working figures for the compressor running:
- 1.0 ton, non-inverter: around 1.2 kW
- 1.5 ton, non-inverter: around 1.8 kW
- 1.0 ton, inverter: around 0.6 kW averaged over an hour once the room is cool
- 1.5 ton, inverter: around 0.9 kW averaged over an hour once the room is cool
Why the inverter figures are averages and the others are not. A non-inverter compressor is either fully on or fully off; an inverter modulates its speed, running hard during the initial pull-down and then throttling to hold temperature. So an inverter's first hour costs close to a non-inverter's, and its fifth hour costs far less. Averaging over a full night is the fair comparison — which is why short bursts of AC use are the worst way to run an inverter unit.
Number 2 — your tariff slab
This is the number that actually decides your bill. Domestic rates run roughly Rs 7.74–10.06 per unit for protected consumers and Rs 23.59–43.95 per unit for unprotected consumers.
A protected consumer pays about a quarter of what a top-slab unprotected consumer pays for the identical electricity. Same AC, same hour, same room — four times the cost. No efficiency upgrade available anywhere comes close to mattering this much.
The cost table
Power draw × rate, computed across every combination. Figures in rupees per hour:
| Unit | Draw | Protected (Rs 10.06) |
Unprotected low (Rs 23.59) |
Unprotected mid (Rs 35.00) |
Unprotected top (Rs 43.95) |
|---|---|---|---|---|---|
| 1.0 ton inverter | 0.6 kW | Rs 6.04 | Rs 14.15 | Rs 21.00 | Rs 26.37 |
| 1.5 ton inverter | 0.9 kW | Rs 9.05 | Rs 21.23 | Rs 31.50 | Rs 39.56 |
| 1.0 ton non-inverter | 1.2 kW | Rs 12.07 | Rs 28.31 | Rs 42.00 | Rs 52.74 |
| 1.5 ton non-inverter | 1.8 kW | Rs 18.11 | Rs 42.46 | Rs 63.00 | Rs 79.11 |
Read across a row to see what your slab costs you. Read down a column to see what your AC costs you. The rows vary by a factor of three; the columns vary by a factor of four. Your slab is the bigger lever, and it is the one nobody advertises.
What that means over a month
A realistic summer pattern is eight hours a night — roughly 240 hours a month.
| Unit | Units used/month | At Rs 23.59 | At Rs 43.95 |
|---|---|---|---|
| 1.5 ton inverter | 216 | Rs 5,095 | Rs 9,493 |
| 1.5 ton non-inverter | 432 | Rs 10,191 | Rs 18,986 |
Two warnings about these monthly figures. First, they are the energy charge only — your actual bill adds fuel price adjustment, taxes, and various surcharges on top, so the amount you pay will be meaningfully higher. Second, and more importantly: adding 432 units to a household's consumption can push it into a higher slab, and the higher rate then applies to the whole month's usage, not just the extra units. That is why an AC switched on in June can appear to double a bill rather than add to it.
Measure your own — thirty minutes, no equipment
Every figure above is an estimate from rated power. Your actual unit, in your actual room, at your actual outdoor temperature, will differ. Here is how to get the real number.
- Turn off everything else you reasonably can — other ACs, water pump, geyser, washing machine. The fridge will cycle; accept a small error from it.
- Photograph your meter reading with a timestamp.
- Run the AC for exactly one hour at the temperature you normally use.
- Photograph the meter again.
- Subtract. The difference is your real kWh for that hour.
- Multiply by your per-unit rate — take it from your own bill, not from this article.
Do it twice: once starting from a hot room, once after the room has been cool for a few hours. On an inverter unit those two numbers will differ substantially, and the gap between them is the single most useful thing you can learn about your own AC.
What actually reduces the number
Ranked by how much they move the figure, not by how often they are repeated:
- Raise the thermostat. Every degree cooler costs roughly 3–5% more energy. Running at 26°C instead of 20°C is a large saving for a difference most people stop noticing within a week. This is the highest-return change on the list and it costs nothing.
- Stay in your protected slab if you are anywhere near the boundary. Worth more than any other single action, because it reprices every unit in the month. Check your bill for how close you are running.
- Run a ceiling fan alongside the AC. A fan costs a fraction of an AC per hour and lets you hold a higher thermostat setting for the same comfort.
- Close the room properly — door, curtains against direct sun, and any obvious gap. You are paying to cool whatever volume is connected to that room.
- Clean the filters monthly. A clogged filter makes the unit work longer for the same result.
- Run longer sessions rather than short bursts if you have an inverter. Repeated pull-downs are where inverter efficiency is thrown away.
- Service the outdoor unit. Blocked or filthy condenser coils cost you continuously and invisibly.
Notice that the two biggest items are a thermostat setting and a tariff slab — neither of which requires buying anything. The full ranking across every household appliance, with the same measured approach, is in our guide to cutting your electricity bill.
Is an inverter AC worth replacing a working unit for?
On the numbers above, a 1.5 ton inverter saves roughly Rs 5,000–9,500 a month against a non-inverter at eight hours a night — but only across the cooling season, which is not twelve months, and only if the old unit is genuinely going. Against the purchase price plus installation, that is a payback calculation with a real answer, and it deserves its own article rather than a paragraph here.
What is clearly worth it: choosing an inverter when you are buying anyway.
Frequently asked questions
How many units does a 1.5 ton AC use per hour?
Roughly 1.8 units an hour for a non-inverter with the compressor running, and roughly 0.9 units an hour averaged for an inverter once the room is cool. Your unit's rating plate gives its actual figures.
Does setting a lower temperature cool the room faster?
No. The compressor runs at the same capacity either way; setting 16°C instead of 26°C does not accelerate the pull-down, it simply means the unit keeps running long past the point you were comfortable. This is the most expensive misunderstanding in household cooling.
Is it cheaper to leave the AC on all day or switch it on and off?
For an inverter, fewer and longer sessions generally win, because each restart forces another high-power pull-down. For a non-inverter, switching off when the room is genuinely unoccupied for a long stretch wins. Neither answer justifies running an AC in an empty room.
Why did my bill jump so much more than the AC's own cost?
Most likely a slab change. The higher rate applies to your entire month's consumption rather than only the units above the threshold, so crossing a boundary reprices everything. Fuel price adjustment and surcharges also move independently of your usage.
Do stabilisers or "energy saver" devices reduce AC cost?
A stabiliser protects the unit; it does not reduce consumption. Plug-in devices marketed as energy savers for domestic supply do not deliver meaningful savings. Spend the money on servicing instead.
What temperature should I actually set?
26°C with a fan running is the setting most households find they can live with, and it is dramatically cheaper than 20°C. Try it for a week before deciding it is not enough.
Sources and method. Tariff bands are published NEPRA 2026 domestic schedule rates — Rs 7.74–10.06 per unit for protected consumers and Rs 23.59–43.95 for unprotected. These exclude fuel price adjustment, taxes and regulatory surcharges, which are applied separately on your bill; the Rs 35.00 "unprotected mid" column is an illustrative intermediate rate, not a specific published slab. Power-draw figures are typical ratings for the stated tonnages; individual units vary and your rating plate is authoritative. Every cost figure in this article is an original calculation (kW × rate) performed for this post, not survey or measured data — the meter method above is how you obtain measured data for your own unit. Verify your slab and rate on your own bill before acting on any of it.
