Heat pumps are gaining popularity in Europe despite a sales dip, with 24 million units installed, significantly reducing greenhouse gas emissions. They work by extracting energy from air, ground, or water, and can operate efficiently even in cold climates. While installation costs are high, they can save money in the long run and are suitable for various building types. Noise levels are generally low, especially for ground-source heat pumps. Teljes cikk (Euronews.com)