Evapolar is cooling me in THE WORST conditions! I started this amazing cooler 3 hours ago in greenhouse conditions. My greenhouse heats my house and I thought....what an Impossible challenge! I threw open my house windows into the greenhouse and was hit by high temp from a greenhouse in bright hot sun all morning and HUMIDITY!! The humidity was so high that the windows were fogged with running water, the roof of the greenhouse was raining and covered by droplets of water and my glasses fogged immediately! I set up the Evapolar because I was Hot from Mowing and now the house temp (and high humidity) felt unbearable. Set up was fast and easy! I wanted to power it with a power source so I could take it camping....how long can it run?.....AMAZING Relief from the heat! I sat facing the fan only 2 ft or a little less away. I set it on 77% for fan because I wanted to have the minimum setting that felt good. And it FELT GOOD! I cooled faster than my battery for lawn mower recharged, in fact I had to back away a little. The drop in temp showed only 3.7 degree drop...BUT Wow that felt good and refreshed! I finished mowing the yard, closing the windows before I left. Surfaces in the house were dripping, doors, faucets, Felt hot and stuffy and humid when I came in again, but surprising the Evapolar had dropped temp 2 degrees and the difference between room temp and coming out of Evapolar had changed to a 4.2 degree change. Sat in front of the cooler really feeling overheated and Ahhhhhh cooled me down ! The sun came thru the windows but I left them closed the temp diffence went between 3.9 to 4.3 degree drop and that FELT GOOD! What a horrible test to do to a machine....worst conditions! I wanted to know right away if I was going to keep it! Even at a 3.4 change in temp when I first started FELT So GOOD! I was looking for something to take camping that would work in mid west hot humid summers that would bring my temp down quickly and WOW! Iowa is never this humid! I know in the past that the greenhouse goes way over 100 degrees on sunny days. So it was a unfair test but I am Delighted that it worked so well. It is 4 hours and water tank is about 1/4 full (so humid it can't use much water) that power pak is still going strong! My unit is built well of sturdy materials. I do wish temps were in F not C. I have no desire to use Aps etc....simple pleases me. I like the operation bec it is logical and did not require a lot of instruction time. I think that it is slowly cooling this whole room....but that is not what it is Good at. What it is GOOD At is Cooling Me in conditions only a 5000 BTU air conditioner could have and I would have had to sit directly in front of it to cool as much as this little Evapolar did!! If that is what you want....Personal Cooling....this is a Wonder! This machine is whisper quiet which I like too. My house is still hot and humid...I find I want to stay in front of the cooler....so if you want to wander around doing other things this is not for you...but if you want quick relief, or good sleeping it is an amazing little thing! Each person should have their own. Update...theRoom IS cooler and the difference in temp from room to what is coming out the Evapolar is 4.5 to 5 degrees cooler and I have to move back now or feel too cool. I LOVE It!No discounts, gifts, or influences! I make my reviews independently.