I Need a Solution for a Hot Guinea Pig

The local power company has just sent out an alert warning of black-outs due to excessive heat in the SD area.  I’ve got a heat sensitive guinea pig (Snowball) at home that we leave the AC on for, set at the hairy edge of little Snowball’s survival envelop.  Any ideas out there on how to keep little Snowball alive and cool during this heat wave if the electricity blacks out while I’m at work?  This is particularly important as we are in the middle of  our hottest days of the year in So. Cal — Aug – Oct.  Steve and I were so worried while we were at Dland that we were going to come home to a dead pet.