I broke down and bought the Cool Brewing chiller bag that is sold online. It works great for both heat and chilling. Kind of expensive, but my summer ales are much happier chilled down with a couple small water bottles that are frozen and swapped out daily. For lagers, I use a chest freezer on an external thermostat.
My kids are out of the house now, so no one to blame about lights left on but me and the wife (make that me....)