Which clause in a maintenance agreement saves the most in the field? From the service sales side, my vote is quarterly coil cleaning with documented filter swaps — one university client saw emergency calls drop 38% over 12 months and signed a 5-year renewal; curious if your numbers tell a different story.
Quarterly coil cleaning pays, but the clause that’s saved us most is an annual economizer functional test with damper calibration and OA sensor swap if drift >2°F — economizers are the silent saboteurs of RTUs (DOE’s Advanced RTU Campaign backs this up: https://www.energy.gov/eere/buildings/advanced-rtu-campaign). We also write in a temporary lockout until it’s fixed to stop short-cycling; @OP do you bundle that test in your PMs?
The clause that’s saved us most is an annual electrical torque and contactor audit. Torque all line/load lugs to spec, log phase imbalance, and preemptively replace any noticeably pitted contactors; after adding it, nuisance trips fell about 30% across nine grocery sites and we caught a cooked lug before it took a compressor. Pairs well with @blee908’s economizer checks, and if you bundle a quick IR scan it amplifies the hit rate — loose lugs are sneaky gremlins.