I have a few pizza prep tables that we are servicing. The bottom temps 38 degrees however the top bins will not pull down below 45-48 degrees. Both units are open top air cooled (not cold rails) w/ a flip down cover. One unit is a BEVERAGE AIR - MOD#SUR72-18 & the other is a TRUE (model number not know, 2 door prep table open top as well) The kitchen is in Arizona, cooled by a swamp cooler (over 55-65% RH @ anywhere from 85-100 degrees & next to fry hood, pizza oven, etc) The condensate pan is flowing over & these units are heavily used. The humidity is so bad that the exterior of the cold top area sweats & condensed water all over. I have attempted to change the thermostats from the A12-701 to the A12-700 for a lower cut in, however the tops are the issue. I did also notice that the bev air unit has a center mounted back wall evaporator that sucks from the middle area and blows to the bottom, not making it up to the top. I have over 7 years in commercial refrigeration and this seems to be related to the external sources of heat and moisture being generated. Any suggestions would be appreciated, this customer has been tagged by the heath dept for revocation of the license if not taken care of ASAP. Other than installing a/c & shutting off the swamp cooler, anyone have good ideas? I welcome anyone's input.