Will this floor hold up well in heat? I need a dance floor that can be installed in an un-airconditioned warehouse and hold up year round without warping.

Our Adagio Tour Rolls would hold up just fine in a non-temperature controlled room. If the rolls are not glued down, what you will see is expansion and contraction of the floor, which won't be an issue as long as you install the flooring with the proper expansion gapping. We would recommend leaving about a 1/2" around your floor to allow the floor to expand and contract properly.