Hi, the ATO website gives an example of how to calculate the KWH usage for Ben who has a separate work from home office with aircon running when he is working from home.
The example is not clear on how the kw per hour is calculated. In the example the air con unit is a 3.5kwh capacity with an end result of 1.09 kw per hour usage estimate. How is this usage calculated based on the energy efficiency rating.
for example, if a unit has a 15kwh capacity and an EER of 3 does that mean it is calculated to cost 5 kWh to run?
Example: electricity for cooling and heating
Ben works at home several days per week and keeps a record of the total hours he works from home. His record shows he worked a total of 768 hours from home in 2023–24.
When he works from home, Ben sits in a separate room of his house and always uses the air conditioner in the room when he is working. His air conditioning unit is small with a 3.5 kilowatt (kw) capacity. Based on the unit's energy efficiency rating, the unit costs Ben 1.09 kw per hour to run.
Based on his electricity bills, Ben pays 27.81c per kilowatt hour (28 c rounded up) for electricity.
Ben calculates the cost of cooling and heating for the room he uses when he is working from home as:
1.09 kw per hour × 0.28 per hour = 30.52c per kw hour
768 hours × 30.52 c = $234.39.
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