Typical energy efficiency of heating is comparable to AC. The baseline solution is using waste heat from electricity generation and industrial processes. Geothe

Typical energy efficiency of heating is comparable to AC. The baseline solution is using waste heat from electricity generation and industrial processes. Geothermal heat pumps have become popular in the past decade or two, and lake/seawater heat pumps are seen as the future of district heating systems in dense cities. The big difference is insulation. On the average, houses that need heating are better insulated than houses that need air conditioning.