Which solar attic fan is best? As most homeowners already know, attics can get extremely hot. Lacking the proper ventilation found in the rest of the home, these upper rooms can feel like they’re baking in the sun, sometimes leaving you with room temperatures that regularly exceed 100 degrees in the summer. Hoping to take advantage of the sun rays that relentlessly beat down on their roofs, many consumers are purchasing solar attic fans because they require no electricity, reduce their carbon footprint and perform just as well as conventional fans.