A man with eyeglasses wearing an N95 bifold respirator holds up a CO2 meter displaying 471 ppm. In the background is a radiology monitor with a test patter

David Elfstrom, P.Eng, CEM, CMVP

Independent Energy Engineer

With a career spanning medical physics, systems administration, and energy management, David is the “go-to” resource for projects requiring independent professional assistance.


  • Facility Energy Audits
  • RETScreen Expert Software and Training
  • Energy Project Measurement & Verification
  • Compressed Air Systems
  • Ventilation Assessments
  • Portable Air Cleaner Performance Evaluation
  • Digital Mammography Physics Assessments


David Elfstrom, P.Eng, CEM, CMVP
Stratford, Ontario
Professional Engineers Ontario

Authorized by the Association of Professional Engineers of Ontario to offer professional engineering services.