acclimating with the heat can be pretty dangerous endeavor if you dont understand what you are trying to accomplish. The wood comes out of the mill 6-9 percent and depending on where you live and the construction of your home that could be perfect, or it could be way too low or way too high. A floor that is already dried to say 7% then you bring it on the job for 3-4 weeks with the heat running. The heat will continue to dry the floor out even more dropping the m/c even more down to maybe 5% thus shrinking the floor just slightly. So you happy, its sat there for x number of weeks and install the floor tight together everything looks good and life goes on. Next summer you notice your floor is a little wavy and the edges are higher than the middle? whats wrong? I let the floor acclimate like the instructions say? What most manufactures dont put in the instructions is that you should acclimate to a year round average/ median temp and humidity not the current conditions.