Updated: August 2026
A 1.5-ton AC power consumption per hour is roughly 1.5 units for a non-inverter unit and about 1.0 unit for a DC inverter running at a 26°C set point. Over an 8-hour night that works out to around 360 units a month for the non-inverter and 240 units for the inverter. At the unprotected domestic rates in force as of August 2026, that single AC adds roughly Rs 18,000 to your monthly bill on a non-inverter and about Rs 12,000 on an inverter, once GST, duty and the fuel surcharge are counted. This guide shows the exact units-per-hour, per-day and per-month figures, prices them at current tariff rates, and works through a real household bill so you can see where the money goes.
The AC is the single biggest line on almost every summer bill in Pakistan. In a home billing 600 units in July or August, one 1.5-ton unit run every night is easily 60% of the total. Get the numbers right and the ways to trim it become obvious.
How many units does a 1.5-ton AC use per hour?
“1.5 ton” describes cooling capacity, not electricity use. One ton equals 12,000 BTU per hour, so a 1.5-ton AC delivers 18,000 BTU, about 5.3 kW of cooling. The power it draws to produce that cooling depends on its Energy Efficiency Ratio (EER) and, above all, on whether the compressor is fixed-speed or inverter-driven.
A non-inverter (fixed-speed) 1.5-ton AC has a rated input of roughly 1.5 to 1.8 kW. Its compressor is either fully on or fully off. In Pakistan’s summer, with outdoor temperatures near 45°C and rooms that are rarely well sealed, the compressor runs close to continuously, so real consumption sits around 1.5 units per hour, climbing toward 1.8 for older or oversized units in peak heat.
A DC inverter 1.5-ton AC draws a similar 1.5 to 1.8 kW at startup, then ramps the compressor down once the room reaches temperature. Instead of switching off, it idles at 400 to 900 watts to hold the setting. Averaged over a night at 26°C in a reasonably sealed bedroom, that comes to about 1.0 unit per hour, in a real range of 0.8 to 1.2.
| Type | Rated input | Real average at 26°C | Units per hour |
|---|---|---|---|
| Non-inverter (fixed-speed) | 1.5–1.8 kW | Runs near-continuously in heat | ~1.5 (up to 1.8) |
| DC inverter | 1.5–1.8 kW peak, 0.4–0.9 kW idle | Modulates down once cool | ~1.0 (0.8–1.2) |
Three things push the figure toward the top of each range: a set point below 26°C (each degree colder adds about 6% to consumption), an unsealed or sun-facing room, and a low refrigerant charge that makes the compressor run without cooling properly. A star-rated, high-EER model does the opposite. Pakistan’s National Energy Efficiency & Conservation Authority (NEECA) now runs a star-labelling scheme for split ACs, and a label above 3.3 EER is worth looking for when you buy.
1.5-ton AC units per day and per month
Multiply the per-hour figure by your daily run hours and by 30 days. Most households run the AC 6 to 10 hours a night, so those are the rows that matter.
| AC type | Run hours/day | Units/day | Units/month (30 days) |
|---|---|---|---|
| Non-inverter (~1.5 u/hr) | 6 hours | 9 | 270 |
| 8 hours | 12 | 360 | |
| 10 hours | 15 | 450 | |
| Inverter (~1.0 u/hr) | 6 hours | 6 | 180 |
| 8 hours | 8 | 240 | |
| 10 hours | 10 | 300 |
Read this as a budget, not a promise. A worn 12-year-old non-inverter cooling a west-facing room at 20°C can burn 500-plus units a month at 8 hours. A 5-star inverter in a curtained, insulated room can dip under 200. The machine sets the baseline; the room and the thermostat decide where inside the range you land.
What a 1.5-ton AC costs per month at 2026 rates
Now put a rupee figure on those units. A home running an AC every night is almost always an unprotected consumer using well over 300 units a month, so its units are billed in the higher slabs. The energy charge in the 501-600 unit slab is Rs 40.22 per unit under SRO 279(I)/2026, the tariff NEPRA has kept in force through August 2026. Add 18% GST, about 1.5% electricity duty and the Rs 3.23 per-unit financing surcharge, then subtract this quarter’s Rs 1.9857 relief, and the all-in cost of a marginal unit works out near Rs 50. The table below uses Rs 50 per unit for the all-in column.
| AC type | Hours/day | Units/month | Energy charge (@Rs 40.22) | All-in bill impact (~Rs 50/unit) |
|---|---|---|---|---|
| Non-inverter | 6 | 270 | Rs 10,859 | ~Rs 13,400 |
| 8 | 360 | Rs 14,479 | ~Rs 17,900 | |
| 10 | 450 | Rs 18,099 | ~Rs 22,300 | |
| Inverter | 6 | 180 | Rs 7,240 | ~Rs 8,900 |
| 8 | 240 | Rs 9,653 | ~Rs 11,900 | |
| 10 | 300 | Rs 12,066 | ~Rs 14,900 |
Your own rate depends on which slab your total lands in. A lighter user whose bill sits in the 301-400 slab pays Rs 36.46 per unit before tax, so their AC costs a little less; a heavy user past 700 units pays Rs 47.20 and every AC unit costs more. The full slab ladder is in our guide to the electricity per unit price in Pakistan, and you can price your exact bill with the electricity bill calculator.
Worked example: a Lahore household in August
Take a LESCO household in Lahore that would bill 240 units a month without air-conditioning, from fans, a fridge, lights, a TV and a water pump. As an unprotected consumer, those 240 units are charged at the Rs 33.10 slab rate: an energy charge of Rs 7,944, or roughly Rs 10,000 all-in.
Now add a 1.5-ton non-inverter AC run 8 hours a night. That is another 360 units, taking the month to 600 units total. Here is the part most people miss: unprotected billing gives no previous-slab benefit, so the whole 600 units are now charged at the 501-600 rate of Rs 40.22, not just the AC’s share.
- Energy charge, 600 units × Rs 40.22 = Rs 24,132
- Energy charge without the AC, 240 × Rs 33.10 = Rs 7,944
- The AC’s added energy charge = Rs 24,132 − Rs 7,944 = Rs 16,188
Of that Rs 16,188, about Rs 14,479 is the AC’s own 360 units and Rs 1,709 is the base load being re-priced from Rs 33.10 to Rs 40.22. Once you layer GST, duty and the surcharge on top and net off the quarterly relief, that AC has added roughly Rs 19,000 to Rs 20,000 to the month’s bill. This slab jump is exactly why a bill can double the month the AC comes on. If your bill has spiked and you are not sure why, walk through our checklist on why your electricity bill is high.
Swap the same household to a 1.5-ton inverter at 8 hours and it adds 240 units instead of 360, landing at 480 units total in the Rs 38.95 slab. Its energy charge comes to 480 × Rs 38.95 = Rs 18,696, so the AC’s share is about Rs 10,752, roughly Rs 13,000 all-in. That is close to Rs 6,000 to Rs 7,000 a month cheaper than the non-inverter, in the same room, for the same hours.
Inverter vs non-inverter: is the upgrade worth it?
Over a five-month Pakistani summer, the inverter’s saving in that example is around Rs 30,000 to Rs 35,000 a year. Whether that justifies a purchase depends on your starting point, and the honest answer is not always yes.
Buying a new AC anyway? Pay the inverter premium. A 1.5-ton inverter runs about Rs 135,000 to Rs 170,000 in 2026, against roughly Rs 95,000 to Rs 125,000 for a comparable non-inverter. The extra Rs 35,000 to Rs 45,000 pays for itself inside one or two summers, and the saving repeats every year after.
Already own a working non-inverter? The maths is tighter. Scrapping a functioning unit to buy a Rs 150,000 inverter, purely to save Rs 30,000-odd a year, is a four-to-five-year payback. If the old unit is efficient and the room is small, keeping it and fixing the room (sealing, curtains, a fan) may save nearly as much for a fraction of the cost. Replace on running cost only when the old unit is genuinely tired, gas-leaking or oversized.
The side-by-side unit and rupee comparison, brand by brand, is in our dedicated guide to the inverter vs non-inverter AC bill.
Seven ways to cut a 1.5-ton AC bill
The AC’s number is not fixed. These moves work whether your unit is inverter or fixed-speed, ranked roughly by rupees saved.
- Set 26°C, not 20°C. Consumption rises about 6% per degree below 26°C. Running at 20°C instead of 26°C costs roughly a third more, around Rs 5,000 a month on a heavy non-inverter load. Add a ceiling fan on low and the felt temperature matches 23-24°C anyway.
- Shift off the peak window if you are on a TOU meter. Time-of-use connections pay Rs 46.85 per unit in the evening peak against Rs 34.53 off-peak, a gap of Rs 12.32 on every unit. Pre-cool the bedroom from 5pm to 7pm, then ease the set point up during the 7pm-11pm summer peak. Current windows are on PITC’s peak/off-peak page and explained in our electricity peak hours guide.
- Service before and mid-season. Choked filters and dirty condenser coils force longer compressor runs. A proper service usually claws back 10-15%, worth 40 to 65 units a month on heavy use.
- Seal the room. A door-gap strip, thick curtains on sunny windows and a closed door keep cooled air in and cut compressor time more than any gadget. These are the cheapest cooling upgrades you can buy.
- Check the gas if cooling feels weak. A low refrigerant charge makes the compressor run flat-out for half the cooling. You pay full rate either way.
- Use sleep or timer mode. Shutting the unit at 4am, once the night has cooled, trims two hours off the run, about 60 units a month on a fixed-speed AC.
- Right-size the unit. A 1-ton AC in a small bedroom uses a third less than a 1.5-ton; a 2-ton in a hall uses a third more. Match the tonnage to the room instead of over-buying.
For the whole-home version of this, including fridge, fans and standby loads, see our guide to reducing your electricity bill in Pakistan.
The 200-unit trap
If your bill normally sits below 200 units, one 1.5-ton AC will almost certainly break it. A single non-inverter AC at even 4 hours a night adds around 180 units, and crossing 200 in any one month strips your protected status: that month, and the six that follow, get billed at the far higher unprotected rates. For a low-usage home, the switch from protected to unprotected can cost more than the AC’s own electricity. Our guide to protected vs unprotected consumers has the full mechanics. If you are near the boundary, run fans and a cooler and keep the AC for the worst nights only.
Where solar fits in
At Rs 40 to Rs 50 per unit, the AC load is exactly what makes rooftop solar pay in Pakistan. A 1.5-ton AC does most of its work when the sun is up or in the early evening, so a modest array can carry a large share of it directly, and every unit the panels supply is a unit you do not buy at Rs 50.
The 2026 rules change the design logic. As of August 2026, new rooftop connections are settled on net billing: units you export are bought back at roughly Rs 10 to Rs 11 (confirm the current rate with your DISCO), well under the Rs 21 to Rs 27 that pre-2026 net-metering agreements still earn until they expire. The value now sits in self-consumption, running the AC off the panels in real time rather than exporting a surplus, so a system sized for your daytime and early-evening cooling, ideally with a battery to reach the 7pm-11pm peak, pays back fastest. The eligibility and buyback rates are in our full guide to net metering in Pakistan 2026, and whether the sums add up for your own roof is covered in is solar worth it in Pakistan 2026.
Check your own numbers
Read your meter tonight, then again after one night of AC use, and you will see your real per-hour figure in seconds. Compare it against the ~1.5 and ~1.0 benchmarks above to know whether the unit or the room needs attention. To turn units into a rupee estimate for your city, run them through the national bill calculator or your DISCO’s version, such as the LESCO bill calculator. The AC is the largest lever on your summer bill: a 26°C set point, a sealed room and an honest look at run hours are worth thousands of rupees a month, before you spend a single rupee on new hardware.
FAQs
How many units does a 1.5-ton AC use per hour?
A 1.5-ton non-inverter AC uses about 1.5 units per hour in real Pakistani summer conditions, rising toward 1.8 for older or hard-run units. A 1.5-ton DC inverter averages about 1.0 unit per hour at a 26°C set point, in a range of 0.8 to 1.2. The inverter draws a similar 1.5-1.8 kW at startup, then idles at 400-900 watts once the room is cool, which is why its average is lower.
How much does it cost to run a 1.5-ton AC for a month in Pakistan?
At 8 hours a night, a non-inverter uses about 360 units a month and an inverter about 240. Priced at the unprotected 2026 rates with GST, duty and the fuel surcharge, that is roughly Rs 18,000 a month for the non-inverter and about Rs 12,000 for the inverter. Run 10 hours a night and the non-inverter climbs past 450 units and Rs 22,000.
Is a 1.5-ton inverter AC really worth the extra cost?
If you are buying a new AC, yes. The inverter premium of roughly Rs 35,000 to Rs 45,000 pays back in one or two summers through lower bills. If you already own a working non-inverter, the case is weaker: replacing it purely to save around Rs 30,000 a year is a four-to-five-year payback, so keep the old unit and improve the room unless it is genuinely worn out or oversized.
How many units will a 1.5-ton AC add to my bill at 8 hours a day?
About 360 units a month for a non-inverter and 240 for an inverter. But an unprotected bill has no previous-slab benefit, so those extra units also re-price your existing units into a higher slab. In a worked example, adding a non-inverter to a 240-unit home pushed it to 600 units and raised the energy charge by Rs 16,188, more than the AC’s units alone.
Does setting the AC to 26°C actually cut the bill?
Yes, and it is arithmetic rather than a myth. A compressor uses roughly 6% more energy for every degree below 26°C, so 20°C costs about a third more than 26°C. On a non-inverter running 8 hours a night, that difference is around 120 units, roughly Rs 5,000 a month at 2026 rates. A ceiling fan on low makes 26°C feel like 23-24°C.
Does running the AC only at night save money?
It saves money if you have a time-of-use meter and you keep the heavy cooling out of the 7pm-11pm summer peak, where units cost Rs 46.85 against Rs 34.53 off-peak. Pre-cool before 7pm and raise the set point during peak hours. On a normal single-rate meter the clock does not change your rate, but fewer run hours still means fewer units.
Will one 1.5-ton AC push me out of protected (below-200-unit) rates?
Almost certainly. A single non-inverter AC at just 4 hours a night adds around 180 units, and crossing 200 in any one month moves you to unprotected rates for that month and the next six. For a household that normally stays under 200 units, that jump can cost more than the AC’s electricity, so heavy AC use and protected status rarely coexist.
How much can solar cut my AC bill?
A rooftop system sized to cover your daytime and early-evening cooling can offset most of a 1.5-ton AC’s units, each worth about Rs 50 off your bill. Under the 2026 net-billing rules, exported units earn only about Rs 10 to Rs 11, so the value is in running the AC off the panels directly rather than exporting. A battery to cover the 7pm-11pm peak improves the return further.