I have one purchased for my 5th wheel. Wife passed and downgraded to a small travel trailer. The unit comes with it's own thermostat, digital. Won't work right unless it is installed. Mine is complete, never installed and has the exterior cover, ...
http://www.amazon.com/gp/product/B00EDFM83A/ref=oh_details_o06_s00_i00?ie=UTF8&psc=1Got these to replace all 921 bulbs and work great. Used 18 bulbs and at 25.00 per 10 a good deal
