How Many Watts Does A Window AC Use? An Estimate Cost

Are you wondering how many watts your window ac uses? Or do you want to know what factors affect air conditioner power consumption? Well, look no further! This blog is dedicated to helping homeowners understand the basic concepts of window ac energy usage and costs.

By understanding these concepts, you can better estimate your monthly air conditioner electrical bill costs. Additionally, this blog provides information on different air conditioner ratings and how thermostat settings can impact ac energy use.

So whether you’re simply curious about air conditioner power consumption or you want to save energy in your home, this blog is for you!

How many watts does a window AC use?

Window air conditioners are a great way to keep your home cool during summertime. However, they use a lot of electricity – about 120 watts on average. That means that window air conditioners will use about two hours of electricity each month – and that’s if you have a 2000-watt AC unit.

If your home has a bigger room or you have multiple window air conditioners, the estimate cost may be higher. But don’t worry, window air conditioners are a very energy-efficient appliance and they can help you save money on your energy bill over the long run.

Window AC Unit (BTU)Estimated Watts
5,000 BTU Window Air Conditioner550 Watts of electricity
8000 BTU Window Air Conditioner660 Watts of electricity
100000 BTU Window Air Conditioner900 Watts of electricity
12000 BTU Window Air Conditioner1100 Watts of electricity
150000 BTU Window Air Conditioner1500 Watts of electricity
Small Window AC Unit (5,000 BTU)550 Watts of electricity
Medium Window AC Unit (8,000 BTU)660 Watts of electricity
Large Window AC Unit (15,000 BTU)1,500 Watts of electricity
Small Central Air Conditioner (10,000 BTU)3,000 Watts of electricity
Medium Central Air Conditioner (14,000 BTU)4,000 Watts of electricity
Large Central Air Conditioner (18,000 BTU)5,000 Watts of electricity

How to Install a Window AC Unit – Do and Don’ts

Read on for all the tips you need to make the installation process go smoothly!

How to compute a window AC monthly electrical bill cost?

If you’re wondering how much your window AC costs each month, it’s fairly simple to compute. Just subtract the window air conditioner energy consumption from your total monthly electricity bill.

The formula for determining the hourly cost of operation includes:

  • # of watts x 1 (hour of use) ÷ 1,000 x 0.13 (kWh) = hourly cost of operation

Here’s an example of an air conditioner that uses 550 watts:

  • 550 x 1 ÷ 1,000 x 0.13 (kWh) = $0.071 hourly cost of operation

If that was confusing, here’s a break down of each step of the formula for you:

  • 550 (watts) x 1 (hour) = 550
  • 550 ÷ 1,000 = 0.55
  • 0.55 x $0.13 (kWh) = $0.071

Once you know the hourly cost to run your window AC unit, you can easily find out the total per day, month, and year.

If we assume that you run the unit for eight hours per day, here’s how much electricity it costs to operate a 550-watt window AC unit:

  • $0.071 x 8 (hours per day) = $0.57 per day
  • $0.57 x 7 (days per week) = $4 per week
  • $4 x 4 (weeks per month) = $16 per month
  • $16 x 4 (for the months of June, July, August, and September) = $64 cost per season (or year)

What are the factors that influence how much energy that air conditioner uses?

Summertime is the time of year when air conditioners come in handy. However, knowing how much energy your AC unit uses can help you save money on electricity bills.

To get an estimate, take into account the weather outside, the size and type of window AC unit, and your lifestyle. For example, if you live in a hot climate, a window AC unit that uses less energy would be a better choice.

Additionally, be sure to read the manufacturer’s instruction manual before installing your air conditioner. Knowing how much electricity your air conditioner consumes can help you save money this summer!

What is the difference between EER, SEER, and CEER ratings of AC units?

Window air conditioners come in three energy efficiency ratings: Energy Efficiency Ratio (EER), Seasonal Energy Efficiency Ratio (SEER), and Continuous energy efficiency ratio (CEER). The rating is based on the cooling capacity of an air conditioner unit. For window AC units, EER equals 10, SEER equals 13.3, and CEER equals 16.7.


Energy efficiency rating (EER) – AC unit that has a higher EER is more energy-efficient and uses less power, compared to an AC unit with a lower EER. – SEER rating is also important as it tells you how efficient your air conditioner will be during the winter months, when cooling needs are highest. – Ceiling mounted air conditioners (CMACs) have a Certified Energetic Retrofit (CER) rating which signifies that they have been designed to use less power than traditional models.


AC units have improved in efficiency significantly over the years, but there are certain units that still manage to save more energy than others. The Seasonal Energy Efficiency Ratio (SEER) is one of these gauges and measures how much energy a particular AC unit can save over a given period of time. The higher the SEER rating, the greater the efficiency of that unit becomes. In addition to this, EER also considers noise levels and cost-of-ownership when measuring an AC unit’s performance. Commercial Energy Efficiency Ratio (CEER) takes all these factors into account to give an overall score for each brand of air conditioner.


CEER (Cooling Economy Efficiency Rating) is an air conditioner efficiency rating system that helps you find the cooling capacity of an air conditioner in units of watts. Higher ratings mean better cooling power and a higher unit price. The rating also determines how much energy the AC will use in order to achieve a certain temperature. To calculate your CEER, first identify the wattage of your current air conditioner and then consult one of the following calculators: – SEER (Standard Energy Efficiency Rating) calculator for central heating systems – EER (Efficient Energy Ratings) calculator for window units

How does thermostat setting impact air conditioner’s power consumption?

Most air conditioners use electricity to power the cooling unit. The thermostat can impact this usage by altering how much air conditioning is actually turned on when it’s hot outside. For instance, if you set your air conditioning at 66 degrees and it’s already 85 degrees out, the AC will run constantly in an effort to maintain that temperature which could use more energy than necessary. When setting your thermostat, aim for a comfortable temperature rather than one that falls within a specific range or uses precise wattage numbers to activate the AC unit.

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In this blog, we have provided you with an estimate of how much power an air conditioner uses depending on the thermostat setting. This information is important in order to help you calculate your window AC’s monthly electrical bill cost.

By understanding how the power consumption of your air conditioner is impacted by your thermostat, you can make informed decisions about cooling your home in the most energy-efficient way possible. Thank you for reading!

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