Warning, long review. And probably TMI. TLDR: Absolutely awesome heater once you figure out the best placing and setting. And it DOES work well even in an RV in below freezing temps. Pro tip: Plug into an outlet, not an extension chord, unless it's a heavy duty outdoor yellow one. Don't plug in other things on the same plug/breaker. This heater is nothing short of amazing. I wasn't impressed with the fans put out by this company, because while they move air you can't really feel it unless you're right in front of it, but this heater is just unbelievable in how well it heats a room. Regular space heaters are dangerous at the Hi temp, do Ok at the Low temp, and only truly can be safely run when you're at home. They also, for all the intense heat they can put out, don't really heat a room that well. I live in an RV and usually ended up using 1 heater in 60 to 70 degree weather, 2 space heaters in 50 to 60 degree weather, 3 in 40 to 50, and 4 in below 40. To be safe, I would buy new ones every year or two and run the 4th one to an outside plug. My electric bill would be as high as my AC bill in the summer. The Vornado heats the ENTIRE room as long as you have it set in the optimum spot and leave it on to regulate temperature. You wouldn't think it could. The first time I tried the 1st one I bought last year, I thought it was broken or defective because it put out very little heat, or so it seemed. But I gave it time to heat the room and when I came back in an hour later, it was almost uncomfortably warm. *TIP: It needs to be set up to where it can blow across a room unobstructed and have air flow to the backside.* I use this in my bigger area (living room and kitchen), which is 20Lx10Wx9H, and keep my ceiling fan on the reverse flow. What I found: The HI (3) setting I reserve for when it's under 50 outside. This is the setting that will allow you to feel some heat if you personally need warming up. The medium (2) setting is great for 45 degrees and up. The low (1) for 55 and up. But that's for me in my RV's main area. It may be different for a better insulated room with lower ceilings. I do have to run a second heater, a space heater, to add some extra heat in the room when it gets below 35, but that's because of my poor insulation, not because the Vornado is in any way a bad heater. It's also so quiet you wouldn't know it's running until you get close to it. Vornado sticks by their warranty and responds fairly promptly. The ONLY con about this heater is finding the optimum setting as it changes depending on room temperature, and if there's a cold wind blowing outside. I tend to run it between 3 and 6 depending on outside temps and what setting I have it on. Other people may find they need to set it differently. I like my RV between 70 and 75 in the colder months for my elderly cat. As of now 10/12/19, we dropped to 48 degrees from 80 in the space of an hour yesterday morning. I left a space heater running in both rooms (at the marked spots I had figured out equalled 70-75), because I couldn't get to my Vornado quickly, and because it had originally said we would get up to 70 degrees. It only got up to 55 outside and I came home to inside being 65, with the heaters likely having run the whole time (On Low). I found my Vornado and set it up on HI, left the space heater on at 70, just in case, and waited. Within an hour, my RV was at 76. I adjusted it to 5 at medium and it dropped to 70 inside in an hour. I left it at 5 but turned on HI and went to sleep, with the space heater still on for support just in case. Woke up to 75 degrees inside, 55 outside. So, I think I've figured out the settings: At HI 4 is 70, 5 is 75, 6 is 80, 7 is 85, when you leave it on constantly to regulate the temperature. Approximately. I'm sure the heat setting makes that vary some, but maybe not. I don't think my space heater has come on since the Vornado got going. This is by far the best investment you could make on a heater for a room. Edit 11/11/19 I left this morning with it being warm at 70. It was predicted to drop to the 40s by 8 pm. No problem, I thought. I left the Vornado on at #2 heat #5 on the dial. I also had a digital space heater set at 72 on Low just in case I got home late. Well, it dropped 4 hours early and I raced home at 6 because I was sure my poor elderly cold sensitive cat would be freezing. I've never had less than 4 heaters going in 40 or under weather. It's a nice 70 degrees inside while it's 35 outside. See pictures. I'm going to try only running the Vornado tonight on #3 heat #5 on the dial and see what happens. It's supposed to get down to 28 tonight. Edit 9/15/20 I dusted off my Vornado and used it last week when we had a cold front blow through. We went from 75 lows to 50s low and a high the next day of 75. It was the only heater on during this 24 hour period of time and with my elderly cat having passed away, heating the place above 70 isn't necessary anymore. The heater worked great. I set it on the #2 setting and put the dial between 3 and 4. With cold wind blowing outside and temps in the 50s the heater managed to heat my RV up to 75. I adjusted the dial a smidge and my place stayed between 70 and 72 all night. I will never buy any other brand of heater ever again as my main heat source. Edit 11/11/22 Still LOVE this brand of heater. Best in it's class plus some! My ONLY complaint is and has been the internal thermostat. We had a drop from 70s to 40s yesterday. I have since purchased a thermostat plug specifically for heaters and ACs, still on the dedicated plug, that more accurately reads temps in the room, particularly in the area I want a certain temperature. Paired together, it's a "set it and forget it" situation. I never again have to worry that as long as the power is on, my RV has reliable heat in cold temps, and that it won't go into roast mode, or shut off too soon. AND my electric bill dove down to below $50. Win win win! I have not received anything at a discount for my review or had any offer of such.