Fridges & freezers
Lastly, fridges and freezers are tested for energy consumption during the first 24 hours of operation. However, if it's a frost-free appliance then the energy efficiency rating tends to be more consistent or more accurate than in a non-frost free appliance. This is because energy efficiency deteriorates as ice builds up in the freezer compartment.
Advances in technology have enabled fridges and freezers to become so energy-efficient that a new class of energy efficiency has been introduced, meaning an A++ or even A+++ appliance is now available. To get the most efficient performance from your appliance, try turning up the temperature of your fridge when you’re on holiday and it’s empty, and remember to avoid leaving doors open any longer than necessary.
And the brick in the oven? According to Electrolux, a brick is placed in the oven at a set temperature, and as it heats up the energy consumption is monitored. The useable volume is then calculated to give the energy efficiency. So now you know!
Find out more about energy efficiency in electrical and technology products in our buying guide.