A ventilation system utilizing fans to bring air into a building and/or exhaust air out of the building powered at least in part by solar panels that can be quickly and easily mounted on the building, such as on roof vents, windows, and the like adjacent to the fans. A sensor may be operatively connected to a controller or logic circuit to measure environmental factors to determine whether to activate the fans. The ventilation system is configured to be a modular device with versatile fasteners for easy installment in windows, attics, or roof tops.