Case Study

Calgary Board of Education - Multiple Locations

Calgary, Canada

$14,413 (CAD)


90,400 kg CO2e

The performance of EndoTherm was piloted by the Calgary Board of Education in four schools. These were selected as a representation of schools across their district.

The chosen pilot sites were paired with alternative sites of similar size/age and boiler specifications. A control analysis will be conducted at these four sites to act as a comparison to the EndoTherm pilot sites.

The 8 sites that were selected that had no significant changes in operation (bar initial COVID lock-downs) or new technology implementations.

The analysis methodology takes guidance from IPMVP (Option C) looking at gas bills. Space heating is the dominant load for each of these school facilities.

A baseline was created using monthly billing data from March 2019 to November 2021 normalized using Heating Degree Days date from nearby Calgary International Airport (CYYC) at a baseload of 18.5°C.

Figure 1: The baseline analysis at HD Cartwright.

The baseline was split into various time periods including data pre-COVID, data during the initial lock down period and finally data since Fall 2020 which was often in line with school re-openings and ASHRAE guidance. For the most part, schools showed changes in their natural gas consumption from Fall 2020 and thus this shorter baseline was used for the EndoTherm analysis.

The chosen analysis uses the trend-line from the baseline to predict gas consumption for each monthly period. This is compared to the recorded values to determine changes in system efficiency. All sites were monitored up to the end of April 2022.

Figure 2: A comparison of pre & post consumption data normalized with Heating Degree Days at Churchill High School.


EndoTherm Site Saving % Energy Saving (GJ)
Sir John A MacDonald 3.90% 97.92 GJ
Bob Edwards 5.03% 128.77 GJ
Clarence Sansom 8.70% 215.17 GJ
Sir Winston Churchill 18.39% 1,359.88 GJ
Control Site Saving % Energy Saving (GJ)
Wilma Hansen -64.07% -1,045.69 GJ
Sir John Franklin -5.06% -152.17 GJ
H D Cartwright -1.56% -40.10 GJ
Annie Gale -5.97% -116.32 GJ
Average of EndoTherm Sites 9.01%
Average of Control Sites -4.19%
Difference 13.20%



Total Saving:


Total Financial Saving:

$14,413 (CAD)

Total CO2e Saving:

90,400 kg CO2e


Carbon Reduction Equivalents:


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