1. Çolak L, Kılkış B, Yaltay CE, Dalarslan M (2013) Solar assisted pumping by a PHVT system in rural regions, 2013 ISES solar world congress. Elsevier, Energy Procedia
2. Cowan D, Gartshore J, Chaer I, Francis C, Maidment G (2009) IOR. Real zero- reducing refrigerant emissions and leakage-feedback from the IOR project, Proc Inst R 2009–10, pp 7–1 to 7–16
3. EU (2016) Communication from the commission to the European parliament, The council, The European economic and social committee and the committee of the regions. An EU strategy on heating and cooling, SWD (2016) 24 Final, Brussels, 16 Feb 2016 COM (2016) 51
4. ECBCS, Annex 37. Heating and cooling with a focus on increased energy efficiency and comfort-project summary report.
http://www.iea-ebc.org/Data/publications/EBC_Annex_37_PSR.pdf
. Last visited: 15 Aug 2019
5. EEA (2018) Air quality in Europe-2018, Report no: 12/2018