Eva's family crunched the numbers and decided to install air conditioning units with heat pumps in the house in Santa Margalida where she, her children, daughters-in-law, and grandchildren live. "It's old and takes a long time to heat up and cool down," she says. Their comfort lasted until their first bill arrived: 384 euros. "It lowered our blood pressure. The impact was very severe. It caused us more headaches than joy. We installed them ourselves, and they had given us one as a gift," she confesses, to justify their investment.