There are a wide range of ways in which having an answer to this question can help home and property owners. For instance, this can help you predict the cost before fitting a new unit. However, regardless of your purpose, this guide has been created to give you an idea of the energy usage that’s associated with different types of air conditioners. Let’s take a look! First and foremost, it should be said that there’s no straightforward answer to this question as there a number of variables that can affect the energy efficiency of one’s air conditioning unit. As a result, the calculations for your personal space may vary from the estimates you’ll see on the internet. For example, the type of air conditioner you choose to install will be a key determinant of your system’s energy usage.   On the average, a central air conditioning system incorporates within the range of 3000 and 3500 watts per hour during the summer months. However, if you happen to operate the “fan only” mode of your central air conditioning unit, the energy usage will most likely drop to about 750 watts per hour. For a mid sized portable air conditioning unit, you can expect the system to consume an average of 2900 watts per hour. However, large units as you would have expected would exceed the energy usage of central air conditioning units, this can be up to 4100 watts per hour. For a mid sized window air conditioning unit, this will consume about 900 watts per hour. While you can expect the smaller unit to use about 500 watts per hour and the larger ones to consume about 1440 watts per hour.