Overview

• Heat pump sales in Germany grew by 35% in Q1 2025 compared to the same period in 2024, supported by subsidies covering up to 70% of installation costs.
• A large-scale ETH Zürich study revealed that one in six heat pumps underperformed, with 17% of air-source models failing to meet European efficiency standards.
• Researchers recommend maintaining low, constant flow temperatures (35–55°C) and avoiding oversized systems to enhance efficiency and reduce energy consumption.
• A survey found that 96% of homeowners with heat pumps would choose the technology again, citing high satisfaction rates and reduced emissions when powered by renewables.
• Real-world user experiences underline the technology's reliability and cost-effectiveness over time, though installation costs remain a significant barrier for many.