Aircon Watts: How Many Watts Does an Aircon Use?

Watts tell you what the unit draws. What you pay depends on how many hours it runs and the rate on your bill, which is what the aircon running cost calculator works out from your own figures.

Aircon watts and kWh per hour, by size

Typical ranges for units sold in the Philippines, the same figures our size calculator and running cost estimator use. Your unit’s nameplate is the one that counts.

1. 1About one unit an hour per horsepower. A non-inverter draws roughly a kilowatt hour for every hour its compressor runs at 1.0 HP, and close to three at 3.0 HP.
2. 2The inverter bar is shorter on every row. It slows down once the room is cool instead of switching off and on, so it settles lower. It draws more than this while it is pulling a hot room down.

1 HP aircon power consumption per hour

About 0.6 to 0.9 kWh for every hour a 1 HP unit runs at full output, and as little as 0.15 to 0.2 kWh an hour for an inverter that has already cooled the room. Those figures come from published spec sheets. LG Philippines lists two of its 1.0 HP inverter split types at 630 and 840 watts rated, and 150 and 200 watts at their minimum. Divide by 1,000 for kWh per hour.

1 HP unit	Watts	kWh per hour
Inverter, rated, spec sheet A	630	0.63
Inverter, rated, spec sheet B	840	0.84
Inverter, at minimum, A and B	150 and 200	0.15 and 0.20
Our typical range, non-inverter	950 to 1,150	about 1.05

The last row is the wider typical range this site's calculators use, which allows for older and non-inverter units. The two inverter spec sheets sit below it. Your own nameplate beats every figure here.

Why real use differs from the nameplate

The nameplate is the unit working at its rated point. Over a real night it is rarely there for long, and what pushes it up or down is mostly the room and the unit's state.

• Inverter or not. An inverter pulls a hot room down near its rated draw, then slows toward its minimum. A non-inverter runs at full draw whenever the compressor is on and drops to the fan alone when it stops, so what counts is how many minutes of each hour the compressor runs.
• The setting. Every degree colder is more compressor time. Our guide to the best temperature for an aircon covers it.
• Heat coming in. Afternoon sun, a roof with no ceiling insulation, more people, a door left open. The same 1 HP unit uses more in a hot room than a shaded one.
• The wrong size. A unit too small for the room runs flat out and never settles, which is the expensive case. The aircon HP calculator finds the size for the room.
• A dirty filter or coil. Less air across the coil means longer running for the same cold. An aircon cleaning brings it back.
• An outdoor unit that cannot breathe. Boxed into a corner or baking in the sun, it struggles to get rid of the heat.
• Low refrigerant. A unit that has leaked gas runs longer for weaker cooling. Why that means a leak rather than a refill is in what is freon.

How to read the watts on your own unit

Look for the nameplate, a sticker on the side of the indoor or outdoor unit. The figure you want is often labelled rated input or power input, in watts. If the label gives only amperes, multiply the amperes by the voltage printed on the same label. Virginia Cooperative Extension gives the same method for any appliance.

1. 1Volts. The supply the unit is built for.
2. 2Amperes. The current it draws while running. Volts times amperes gives watts if the next line is missing.
3. 3Watts. The figure you want. Divide it by 1,000 for kWh per hour of running.

The nameplate figure is the unit at full work. What it actually draws depends on the setting and on how hot the room is, so a unit set to 25 in a shaded room draws less over an hour than the same unit set to 18 in an afternoon-sun room. Our guide to the best temperature for an aircon explains why.

From watts to the units on your bill

Electricity is billed in kilowatt hours, written kWh. Multiply the watts by the hours the unit runs and divide by 1,000. A 1.0 HP non-inverter at around 1,050 watts, running 8 hours, uses about 8.4 kWh. Multiply that by the rate per kWh printed on your bill and you have the cost of the night.

When the rate goes up, the watts stay the same. The things you can change are the hours, the setting, and how hard the unit has to work. A clogged filter or a dirty coil makes it run longer for the same room, which is why a unit due an aircon cleaning costs more to run than the table says.

Starting watts: generators, power stations and solar

The table is running watts. A compressor and a fan are motors, and a motor draws far more for a moment as it starts. Panther, which makes voltage regulators, sizes for motor loads at three times the running figure. A generator, a portable power station or a solar setup that can carry the running watts may still trip on the start. Give the seller your unit’s nameplate and ask what starting or surge rating it needs.

The same rule sizes an AVR. Whether your unit needs one at all is covered in the AVR for aircon guide.

Questions people ask

How many watts is a 1 HP aircon?

Typically 950 to 1,150 watts for a non-inverter while the compressor runs, and 600 to 950 watts for an inverter, which settles toward the low end once the room is cool. The nameplate on your own unit gives its exact figure.

How many kWh does an aircon use per hour?

Divide the running watts by 1,000. Published specs for 1 HP inverter split types put it at about 0.6 to 0.9 kWh an hour at full output and 0.15 to 0.2 at minimum. An older 1 HP non-inverter can use about 1 kWh for every hour its compressor runs, and a 1.5 HP about half as much again.

Where do I find the watts on my aircon?

On the nameplate, the sticker on the side of the indoor or outdoor unit, often labelled rated input or power input, in watts. If it only gives amperes, multiply them by the voltage on the same label to get watts.

Does an inverter aircon use fewer watts?

Once the room is cool, yes. An inverter slows its compressor down instead of switching it off and on, so its draw settles lower. While it is pulling a hot room down it can draw as much as a non-inverter of the same size.

What size generator or power station runs a 1 HP aircon?

One that can handle the start, not just the running watts. A motor draws about three times its running figure for a moment as it starts, by the rule AVR maker Panther uses. Compare that against the starting or surge rating the seller gives, and ask them before you buy.

Choosing a unit, or using less

The biggest decision about watts is the size, and it is made before the unit goes up. The aircon size calculator finds the size for your room. For a new unit, the aircon installation visit checks the wiring and the circuit it goes on. For a unit already running, the running cost calculator shows what your hours and your rate add up to.

Other guides

• Aircon capacitor: what it does and the signs it has failed

  The humming outdoor unit, the fan that will not spin, and why the capacitor is tested first.

• Aircon freezing up: why ice forms and what to do

  Ice on the indoor coil or the pipes, how to thaw it safely, and the three causes behind it.

• Aircon making noise: which sounds are normal and which are not

  Clicks and water sounds that are normal, and the rattles, hisses and squeals that need a technician.

• Aircon not turning on: what to check, and the 3-minute wait after a brownout

  Remote, breaker, the compressor’s restart delay, and the flashing lamp that means a technician.

• AVR for aircon: when you need one and how to size it

  What an AVR does in a brownout, which units already protect themselves, and sizing it from the nameplate.

• Types of aircon: split type, window type, portable and centralized

  How each is installed, how noisy and costly to run it is, which rooms suit it, and what a clean has to reach.

• What is freon, and why your aircon should not need a yearly refill

  The sealed loop, why low gas means a leak, the three refrigerants in Philippine units, and the refill myth.

• Aircon HP and room size: what each size cools, 0.5 to 2.5 HP

  The square metres each size suits in a shaded room and a hot one, with the arithmetic behind 0.6 HP.

• Aircon cleaning schedule: what to clean, and how often

  The filter every two weeks, a full clean by how hard the unit works, the deeper clean, and when in the year to book it.

• Common aircon problems, symptom by symptom

  Not cold, weak air, water inside, a smell, ice, noise, tripping and blinking: what each points to and what you can check.

• Aircon lifespan: how long it lasts, and repair or replace

  How many years a unit usually gives, what shortens it, and the signs that a repair is no longer worth it.

• Inverter vs non-inverter aircon: which costs less to run

  Kilowatt hours side by side at 2, 4, 8 and 12 hours a day, and the kind of use where a non-inverter is still fine.

• What size aircon for a bedroom, living room or kitchen

  Room by room: what each kind of room adds to the size you need, worked through for a sample two-storey house.

• Aircon energy saving tips that lower the bill

  Where the heat gets in, the setting and the fan, the timer, the cleaning, and reading the DOE energy label.

Sources: Virginia Cooperative Extension, “Estimating Appliance and Home Electronic Energy Use”; Panther Products Philippines, “Buyer’s Guide to Purchasing the Best AVR”; LG Philippines product specifications for the HS-09IPX2 (spec sheet A) and HS-09ISY2 (spec sheet B), read 8 October 2026, named as the source of a figure and not recommended. The watt ranges are typical figures for units sold in the Philippines, the same ones used across this site.