1. “Natural Gas Facts | Natural Resources Canada.” https://www.nrcan.gc.ca/science-data/data-analysis/energy-data-analysis/energy-facts/natural-gas-facts/20067 (Accessed 12 July 2020).
2. “Integrated Environmental Control Model.” https://www.cmu.edu/epp/iecm/(Accessed 30 June 2020).
3. Flexible heat pump integration to improve sustainable transition toward 4th generation district heating;Abokersh;Energy Convers. Manag.,2020
4. “Air-Source Heat Pumps | Natural Resources Canada.” https://www.nrcan.gc.ca/energy/publications/efficiency/heating-heat-pump/6831 (Accessed 12 July 2020).
5. Life cycle sustainability assessment (LCSA) for selection of sewer pipe materials;Akhtar;Clean Technol. Environ. Policy,2014