Household Appliances – Which Ones Consume Energy The Most? We all have a bunch of appliances at home that we just can’t live without. Almost all of these appliances run on electricity. However, some of these essential appliances tend to eat up a lot more electricity than others. Not all are energy efficient which begs the question of what appliances take up the most energy. This article will list the common appliances and rank them based on their electrical Florence usage. Appliances based on their energy usages HVAC system The first item on the list is the heating and cooling system. According to statistics, heating and cooling systems can take up to 47% of the total energy usage of an entire household. Air conditioning units and heat pumps require a lot of electricity to provide the much-needed heating and cooling during the winter and summer months. These systems also require maintenance to keep them from running inefficiently.