![Energies | Free Full-Text | It Works—Long-Term Performance Measurement and Optimization of Six Ground Source Heat Pump Systems in Germany Energies | Free Full-Text | It Works—Long-Term Performance Measurement and Optimization of Six Ground Source Heat Pump Systems in Germany](https://pub.mdpi-res.com/energies/energies-12-04691/article_deploy/html/images/energies-12-04691-g010.png?1577817780)
Energies | Free Full-Text | It Works—Long-Term Performance Measurement and Optimization of Six Ground Source Heat Pump Systems in Germany
Climate Impacts on Heating Seasonal Performance Factor (HSPF) and Seasonal Energy Efficiency Ratio (SEER) for Air
![Seasonal performance factor SPF of the heat pump and primary energy... | Download Scientific Diagram Seasonal performance factor SPF of the heat pump and primary energy... | Download Scientific Diagram](https://www.researchgate.net/publication/268191896/figure/fig6/AS:668300820373523@1536346740714/Seasonal-performance-factor-SPF-of-the-heat-pump-and-primary-energy-ratio-PER-h-of-the.png)
Seasonal performance factor SPF of the heat pump and primary energy... | Download Scientific Diagram
![Definition of the seasonal performance factor (SPF) within four system... | Download Scientific Diagram Definition of the seasonal performance factor (SPF) within four system... | Download Scientific Diagram](https://www.researchgate.net/publication/372790195/figure/fig3/AS:11431281211044298@1702302287609/Definition-of-the-seasonal-performance-factor-SPF-within-four-system-boundaries-with_Q320.jpg)
Definition of the seasonal performance factor (SPF) within four system... | Download Scientific Diagram
Climate Impacts on Heating Seasonal Performance Factor (HSPF) and Seasonal Energy Efficiency Ratio (SEER) for Air
![Energies | Free Full-Text | It Works—Long-Term Performance Measurement and Optimization of Six Ground Source Heat Pump Systems in Germany Energies | Free Full-Text | It Works—Long-Term Performance Measurement and Optimization of Six Ground Source Heat Pump Systems in Germany](https://www.mdpi.com/energies/energies-12-04691/article_deploy/html/images/energies-12-04691-g009.png)