O guia de instalação diz
"Under normal conditions, Harmonics® flooring requires no acclimation period. Normal conditions are defined as a difference of no more than 25°F and 20% relative humidity between the stocking/transportation environment of the flooring and the final installation environment of the flooring. Outside of normal conditions, let the planks acclimate for 48 hours in the unopened packaging at the normal room temperature in the middle of the room where the floor is to be installed.Allow air space between packages"
Parece que você pode instalar imediatamente.