Advanced heat pump technology—including inverter heat pump designs and EVI DC inverter models—efficiently extracts and transfers ambient heat in temperatures as low as –25 °C. Innovations like multi‑stage compression, optimized refrigerants (e.g., R32, R290), and smart defrost control maintain COPs above 2.5 in extreme cold. Both air‑source and ground‑source systems, standalone or hybrid, deliver reliable, low‑carbon heating with economical paybacks in harsh climates globally.