There is a significant difference between how homes were built decades ago and how they are designed today. Older homes focused mainly on basic functionality, with simple layouts, limited electrical capacity, and standalone utilities for lighting, ventilation, and water heating. Modern homes, however, emphasize comfort, efficiency, and smart integration through advanced electrical systems, optimized plumbing networks, and energy-saving technologies. One major change is the transition from traditional geysers to centralized hot water solutions that offer greater convenience and efficiency. As homeowners renovate their old homes, the domestic heat pump in India is becoming a popular choice. However, retrofitting a heat pump requires careful planning for plumbing upgrades, space allocation, electrical readiness, and installation requirements.