There's a grocery store that I go to often, and I know the owner. He knows I do HVAC, but I'm more of a resi / light commercial guy. He asked me the other day if:
#1 Do the fans on his rooftop units need to run all day while the store is open?
#2 What the thermostat temps should be set at? (Summer/Winter)
He has them set at around 67-68 degrees.
This is in the Chicagoland area, and during the winter people wear their coats while shopping, being it's cold outside.
He says his electric bills for running all the compressors for refrigeration and cooling is costing him around $15000 a month. This isn't a very large grocery store, more or less a neighborhood grocery store. My guess would be around 50 -75000 sq ft.
My thoughts to the first question was yes the fans need to run all day for MUA.