434 Int. J. Environmental Technology and Management, Vol. 9, No. 4, 2008 Copyright © 2008 Inderscience Enterprises Ltd. Impact of energy efficiency upgrade retrofits on the residential energy consumption and Greenhouse Gas emissions in Canada Burak Guler* and V. Ismet Ugursal Dalhousie University, Halifax, N.S. Canada E-mail: gulerb@aecl.ca E-mail: ismet.ugursal@dal.ca *Corresponding author Alan S. Fung Ryerson University, Toronto, Ont., Canada E-mail: alanfung@ryerson.ca Merih Aydinalp-Koksal Hacettepe University, Ankara, Turkey E-mail: aydinalp@hacettepe.edu.tr Abstract: The impact of various energy efficiency upgrade scenarios on the annual energy consumption and Greenhouse Gas emissions of the Canadian housing stock is assessed using the Canadian Residential Energy End-use Model (CREEM). The energy efficiency upgrade scenarios that are considered include major retrofits, such as the improvement of the house envelope by adding insulation, and the replacement of the existing heating system and appliances by higher efficiency units, as well as minor retrofits, such as lighting fixture, thermostat, showerhead and aerator upgrades that reduce energy consumption. Keywords: residential energy; residential greenhouse gas emissions; energy modelling; greenhouse gas emission modelling. Reference to this paper should be made as follows: Guler, B., Ugursal, V.I., Fung, A.S. and Aydinalp-Koksal, M. (2008) ‘Impact of energy efficiency upgrade retrofits on the residential energy consumption and Greenhouse Gas emissions in Canada’, Int. J. Environmental Technology and Management, Vol. 9, No. 4, pp.434–444. Biographical notes: Burak Guler is a Section Head at Atomic Energy of Canada Ltd. He holds BSc and MASc Degrees in Mechanical Engineering, and is currently working towards a Master of Management of Technology Degree. He has worked in the energy sector in research and development at Dalhousie University while conducting his master’s studies, and afterwards in production at Schlumberger, and for the past five years, in field services at AECL, where he had the opportunity to lead the development of a software