They are selling the FARS for $275. I mean you’d almost be better off buying an entirely new sensor suite with FARS for $422 which would give you spare sensors and parts...rain gauge/cone, transmitter, temp/hum, anemometer, etc. Either that or you can try the $97 daytime fan kit add-on. Basically, the fan will run as long as the sun is hitting the solar panel. It isn’t as effective as the regular FARS though.