I'm Headed Back To Reefer World

It depends how your company has the units setup as far as automatically selecting cycle or continuous.

Welcome back. Ready for some more abuse? Lol

 

The TK units are quieter, Carriers still sounds like a turbo prop winding up for a short field take-off.(at least at my company, and most of our trailers are fairly new)

 

Depends on shippers requirements usually, lots of produce is required to be run continuously because of temperature sensitivity &/or fresh air circulation/humidity requirements while other products such as some class 3 flammables I just hauled can afford to have a 10 degree temperature swing on start/stop cycle.
Some carriers just don't want to risk start/stop so they use continuous all the time.
Also, riskier to use start/stop in low temperatures because of the negative effects on battery start power, short run times, & fuel gelling.

Depends also on if your company has "smart presets" installed on their reefers. On Carrier reefers they are referred to as "Intellisets" & determine a whole host of effects based on the Intelliset parameters such as start/stop or continuous, min/max temps, start temps, stop temps, defrost cycles, recirculating or using fresh air, RPM limits/priority/ramp up, ect.

The older carrier reefers sound like a roaring tornado while the newer emission ready X4 7300/7500 & Vector 8500/8600 use a DPF filter so they have a much lower note that sounds like a slow, droning giant bumblebee & the lower Hz sound travels though barriers (truck cab) better, vibrating & droning into your eardrums much more effectively.

Taking a wild shot that you are going to work for Davis Express out of Starke, FL?