As it warms up, even my basement is in the seventies. I don't have a spare fridge, nor several spare coolers. But, the dirt under the basement is about 55' year round. I put a thermometer on the floor, it's about 65. I put the fermenter on the floor, covered it with a styrofoam box. The wort temp dropped three degrees.
In winter I have to carb beer atop the hutch to find air warm enough. In summer, I use dirt.