Not sure about heat,down here we don't have long spells of cold but this is what I used in my shop to keep it(me) cool in the summer;
They work good and don't tear you up with the power bill.
I've heard they actually work better in dryer,more arid environments than in our pretty much 70% year round humidity. Brother in law was out in Arizona for awhile and said they use them in a lot of warehouses. He said you'd catch a chill walking in to those places. I've still got mine but now I have a heated/air conditioned shop so I don't run it anymore.
The few times it did get unbearable cold I just threw a piece of 1" steel plate up on a turkey fryer burner and things got toasty quick,
Way Cool Evaporative Coolers - Big Fogg Misting Systems & Solutions
WayCool® portable evaporative coolers use the natural cooling process of evaporating water to reduce temperatures up to 30°F at a fraction of the cost of air conditioning
bigfogg.com
They work good and don't tear you up with the power bill.
I've heard they actually work better in dryer,more arid environments than in our pretty much 70% year round humidity. Brother in law was out in Arizona for awhile and said they use them in a lot of warehouses. He said you'd catch a chill walking in to those places. I've still got mine but now I have a heated/air conditioned shop so I don't run it anymore.
The few times it did get unbearable cold I just threw a piece of 1" steel plate up on a turkey fryer burner and things got toasty quick,