This book discusses the new retrofits for HVAC SYSTEMS and the new guidelines for facility managers.This is edition one as COVID is still new to our planet and the guidelines keep upgrading regularly.This book belongs on the shelf of every facilities manager, in offices, factories, residential buildings, hotels, shopping malls, airports, supermarkets and so on.Hope you enjoy reading when it will be available soon.The author has 28 years of international experience on mega HVAC projects including 9 years on Facilities Operation & Maintenance.