Common mistakes in using air source heat pumps can lead to unexpectedly high electricity bills in Finland. According to Jussi Hirvonen of Sulpu, several misconceptions about heat pumps are prevalent among consumers. One frequent error concerns cooling; many believe summer cooling negates winter savings. However, Hirvonen explains that cooling typically consumes only 200-300 kilowatt-hours annually, representing roughly five percent of the winter savings. This indicates that utilizing the cooling function does not significantly impact the overall energy efficiency benefits of the heat pump. Consumers in Finland should be aware of these common misunderstandings to maximize the energy-saving potential of their heat pumps.