In 2009, Lio & Associates proposed a New EnerGuide Rating System to NRCan. The proposed New ERS was developed by considering the data from more than 32,000 HOT-2000 files. These files, extracted from the NRCan database, were representative of new and existing houses from across the country.  Space heating and domestic water heating consumption data were considered.  In addition, the volume, the existing EnerGuide rating, and the number of bedrooms were also considered for each house file. Ultimately the proposed ERS for the building would be the Total Energy Consumption per person in GJ.

The data was analyzed to assess the relationship between the existing ERS and total space and domestic hot water heating energy consumption (S&DHW), the effect of occupancy on the proposed ERS, and frequency of distribution between both the existing and the proposed ERS.

A new ERS system was subsequently developed and was submitted for public consultation. The new EnerGuide Rating System was launched in April 2016.