This wireless network monitors temperature in a warm vegetable storage are for squash and potatoes, and two walk-in coolers.  The walk-in in the barn may need to be heated during very cold temperatures.  An outside temperature sensor is provided along with one in the barn but outside of the walk-in to allow the farmer to tell whether the walk-in needs to be heated.  Both Wifi and sensor radio range extenders are required in this installation because of the amount of interference from stone and concrete block walls in this 200 year old farmstead.