Rooftop HVAC units: do you use gauges or instruments?

[kshepard (Kenton Shepard, CMI)]

… or do you keep it purely visual?

[dtews (Darren Tews, P.E.)]

Depends on the scope of work. Some clients are ok with checking dates and RUL, some want to know if the equipment has any current issues.

[kshepard (Kenton Shepard, CMI)]

What is RUL?

[dtews (Darren Tews, P.E.)]

Remaining Useful Life.