Hello, I will try to keep this short and to the point. The Geo Install Is located in Eastern Iowa. There are 2 Geostar Geo units with QT flow centers installed in a restaurant (2000 sq-ft) built 2 years ago, One unit is 5 ton and the other is 6 ton. These units have never been capable of keeping the building a comfortable temp since day 1 so after a year, they added an additional 5 ton conventional to the kitchen. The kitchen and dining area are each 1000 sq-ft, the kitchen has the 5 ton geo and the 5 ton conventional, and the dining area has the 6 ton geo, the kitchen and dining area are semi separated. The original contractor is gone so I have no information on loop size or location, I believe the loops to be 80-100 percent covered by the huge concrete parking lot, I wonder if it is holding heat under the slab preventing the heat from dissipating. Info for 5 ton Kitchen Geo unit Geostar Magnolia Model YS060TL140CBDSSA Closed loop Horizontal EAT 75.8F LAT 61.3F EWT 121.3F LWT 132.3F Info for 6 ton Dining Geo Unit Geostar Cypress Model QT072TR131CBDSSD Closed loop Horizontal EAT 72.0F LAT 56.3F EWT 110.3F LWT 122.1F I can't believe its not kicking out on high head. What do you guys think? Let me know if there is any other information I can get. Thanks in advance.