The easiest thing to do is call the company...they have a Customer Service Number....call 800-251-0001 (USA & Canada)
I am sure they don't because I researched them from one end to the other....The Key is is to buy the right BTU's for your space. My high setting is 9,000 BTU's. This is a lot of heat for average weather. Also I only live where the good weather is. However, Wintering in the Desert can be very cold at times. Last year in this area during New Years {Ehrenberg/Quartzsite} we fell to around 21 degrees or so, if my old brain remembers right. Also living in Flagstaff towards the end of Summer and Fall...Very cold weather and even snow can arrive in an instant..