Mike Cappuccio of N.E.T.R. shows the value of regular maintenance on your rooftop commercial AC unit, and walks you through the areas that are cleaned and checked during a maintenance visit.
Source
Commercial AC Maintenance – Complete Walkthrough

Mike Cappuccio of N.E.T.R. shows the value of regular maintenance on your rooftop commercial AC unit, and walks you through the areas that are cleaned and checked during a maintenance visit.
Source