Joel, hey bro...I don't have a window unit but you are more than welcome to bring any stock you want me to hold. We have an entire 220g with nothing in it....just cycled water under 2 x 250w MH.

Another thing to do is to bag ice and put it in your sump, use a couple of bags though to be sure the water doesn't leach into your tank. I keep large plastics bags of water in the freezer for emergencies just like this.