Yep, the ole water bottles work wonders, i remember doing that in the garage even with a chiller while the transition tank was out there during the remodel and new tank build. I finally figured out it was my wifes car when she came home from work and parked in the garage would raise the temp about 20 degrees so i had to ask her to park outside for the summer until the remodel and tank was done, that went over real well!