The Department for Energy Security and Net Zero (DESNZ) commissioned the DEEP project, which ran between 2019 and 2024. DEEP was undertaken by a consortium led by Leeds Beckett University (LBU) and supported by the University of Salford (UoS), and Loughborough University (LU).
The Demonstration of Energy Efficiency Potential (DEEP) project combines multiple research activities to provide an appraisal of piecemeal and whole house approaches to retrofits in solid walled homes.
The DEEP project, compared EPC-derived HTC (Heat Transfer Coefficients) with those measured via coheating tests (measured HTC) and found EPCs over-estimated HTC by an average of 42%, a phenomenon known as the “prebound effect,” which was more pronounced before retrofit than after.
