October 2025. TAF commissioned Sustainable Technologies Evaluation Program (STEP) to provide operational analysis and optimization of an air-to-water heat pump retrofit. Key Findings The heat pumps fully met the cooling demand and supplied approximately 70% of the hydronic space heating load, reducing natural gas and carbon emissions by 21,000 m³/year and 30 t CO2e/year, respectively. […]
Publication Type: Case Studies
Home heating and hot water savings from midrise apartment retrofit
January 2024. City of Toronto. In April 2021, TAF joined project partners to retrofit a nine storey 1963 apartment building in Toronto. The objectives were to reduce electricity consumption by 23% by introducing the Innova 2.0 heat pump system into the living room spaces. The project also aimed to reduce gas consumption by 53% by […]
Heat Pumps Add Cooling for Toronto Community Housing Residents
April 2023. City of Toronto. In May of 2019, TAF joined project partners to retrofit a 1987 townhouse complex in Toronto’s east end. We aimed to reduce site-wide energy consumption by 20% by introducing cold climate air source heat pumps (CC-ASHP) into each suite, investigating the opportunity for air source domestic hot water (DHW) heat […]
Stepwise apartment retrofit for savings and comfort
March 2023. City of Mississauga. In August 2020, TAF’s Retrofit Accelerator team joined project partners to retrofit a 12-storey 1965 apartment building in Mississauga, Ontario. The building had recently completed an LED lighting system upgrade, and we aimed to further reduce energy consumption and emissions by introducing energy-efficient heating and cooling, leading to a 27% […]
Lessons from a Heat Pump Retrofit at CityHousing Hamilton
May 2022. Government of Ontario. TAF collaborated with CityHousing Hamilton to plan and implement a pilot project at a three-storey multi-family residential building with 40 units. We installed a heat recovery, variable refrigerant flow (VRF) air source heat pump (ASHP) system in three suites to test the performance of the technology under real-world conditions and […]
Lessons from a heat pump retrofit at Walpole Ave: A case study
January 2021. City of Toronto. To demonstrate the viability of retrofits focused on electric heat pumps, TAF installed and monitored eight cold climate air-source heat pumps (CC-ASHPs) at 66 Walpole Avenue as a pilot project. This case study summarizes the pilot project specifics, results, and learnings.
The Case for Deep Retrofits
September 2020. This report reviews the business case and financing options for deep retrofits in the multi-unit residential building sector, and makes recommendations for improving business case evaluation and financial supports. Some of the barriers to deep retrofits are caused by gaps in information and capability, and can be addressed through education and awareness efforts. […]
Retrofitting Hospital Workers Co-operative: A TowerWise Case Study
March 2020. From 2014-2018, retrofits were undertaken at Hospital Workers Co-operative to improve the energy efficiency of the building. This case study describes the energy efficiency retrofits that achieved major reductions in utility costs and carbon emissions for this 132-apartment building. The retrofit at Hospital Workers Co-op demonstrated that retrofits can provide a compelling return […]
Retrofitting Perth Avenue Housing Co-operative: A TowerWise Case Study
March 2020. In 2014, TAF worked with Perth Housing Co-operative to undertake energy efficiency retrofits in their eight-story building. This case study details the retrofit measures taken at Perth Co-op, which were financed with an Energy Savings Performance Agreement. With this retrofit we: Achieved $84,000 in annual cost savings for the co-op Reduced mobilization costs […]
Retrofitting Trethewey Tedder Apartments: A TowerWise Case Study
November 2019. From 2015-2018, TAF partnered with Toronto Community Housing to undertake energy efficiency retrofits in seven buildings on three sites. This case study looks at one of those sites, Trethewey Tedder Apartments, comprised of two 1970s-era highrise buildings with a joint total of 369 apartments. This work demonstrated that retrofits can provide a compelling […]
