AC Units Per Hour in Pakistan
"How many units does an AC consume per hour" is the most searched AC question in Pakistan. The short answer: a 1.5 ton inverter AC usually uses about 1 unit per hour or less once the room is cool.
Updated 11 November 2026
What is a unit?
One unit on your WAPDA, LESCO, MEPCO, IESCO or K-Electric bill is one kilowatt-hour (kWh): 1000 watts used for one hour.
Units per hour by AC size (approximate)
Inverter AC, room already cool, set at 26°C:
- 1 ton: about 0.5 to 0.9 units per hour
- 1.5 ton: about 0.8 to 1.3 units per hour
- 2 ton: about 1.1 to 1.8 units per hour
- 4 ton floor standing: about 2.5 to 4 units per hour
Non inverter AC of the same size: roughly 1.2, 1.8 and 2.4 units per hour for 1, 1.5 and 2 ton.
First 20 to 30 minutes, very hot afternoons and low set temperatures push the numbers to the top of each range. Exact figures depend on the model; check the rated power in its manual.
How to estimate your monthly AC units
- Units per hour x hours per day x 30 days.
- Example: a 1.5 ton inverter at about 1 unit per hour for 8 hours = 8 units a day = about 240 units a month.
- Multiply by the per-unit rate on your own bill (it changes with your slab and taxes).
10 ways to cut AC units
- Set 26°C instead of 18°C.
- Clean filters every two weeks in summer.
- Keep doors and windows closed; use curtains on sunny windows.
- Shade the outdoor unit.
- Use Eco or Sleep mode at night.
- Use a ceiling fan on low with the AC.
- Do not switch the AC off and on every few minutes.
- Choose the right ton: an undersized AC runs flat out.
- Service the outdoor coil before May.
- Consider a solar AC for daytime use.
How to calculate AC power consumption from watts
- Find the watts on the label or in the specs, for example 1,600 W for TCL TAC-18T3PRO12 1.5 Ton Inverter AC.
- That is the full-power figure: 1,600 W = 1.6 units per hour at most.
- An inverter runs well below full power most of the time. In a cool room it often uses half or less.
- Units per day = average units per hour x hours of use. Multiply the monthly total by your bill's rate.
This is why two 1.5 ton ACs with the same label can give very different bills: room size, sun and set temperature matter as much as the AC.
Do modes and switching off really save power?
- Turbo: uses more, because it runs at full power. Use it only for the first few minutes.
- Sleep and Eco: use less, by raising the temperature or limiting current.
- Dry: often uses less on humid days.
- Switching off and on: with an inverter, turning it off for short breaks saves little, because it uses extra power to cool the room again. Use a higher setting or Eco instead, and switch off only when you leave for hours.
