The Multi-source Heat Pump is a smart, scalable heating and cooling solution that draws thermal energy from multiple reservoirs (air, geothermal water and solar) switching or combining sources to maximize efficiency and reliability. It stores heat locally and uses intelligent control logic to select the most favorable source based on season and temperature. Compared with single-source systems, it can achieve higher seasonal performance factors, provide redundancy for continuous operation, and reduce peak electrical demand. The system uses low‑GWP refrigerants and can reach a COP of up to 4.5 (varying with source and operating conditions). Scalable from a few kilowatts to several hundred kilowatts, it is suitable for both new and renovated buildings, including cold climates.

The main innovations of the proposed system are the following:

1. multi-source operation of the heat pump, combining many natural heat sources
2. use of thermal energy storage systems as heat source for the heat pump operation
3. energy management and control system of the heat pump, resulting to more efficient and reliable operation
4. selection of HFO refrigerant, allowing the use of the heat pump in the future according to F-Gas regulation
5. integration of thermal solar panels with heat pumps leading to a higher temperature operation of the heat pump.