I bought this and the Hi/Lo switch (sold separately) specifically for a 4' x 4' chicken coop and it worked perfectly.
Since I wasn't familiar with how it would perform, the first night I plugged it in inside where I could monitor it for a few hours.
I used a digital thermometer to find out just how hot it would get.
I learned that the backside of the heater stays very cool as well as the edges.
The majority of the heat comes from the center front of the unit. With the Hi/Lo switch on the low setting, the heater reached 115° F and stayed there. Though it was warm, it was not too hot to touch or leave my hand on.
On the high setting, the unit reached about 140° F and maintained that. It was pretty warm to the touch, you could still place your hand on it without burning yourself.
Since I intended to have it in close proximity to hay I did some investigating on the combustion point of hay and found that only after reaching about 150° do you even begin to enter the danger area and only after extended exposure.
Depending on the moisture content, hay typically ignites above about 170° or better, so at the low setting of 115°, you should be well in the safe zone.
Since the manufacturer does not offer a mounting system, I used galvanized plumber's strapping with nuts and bolts to strap the heater securely to the inside of the main door.
The temperature got down to about 21° F last night and using a wireless thermometer with the sensor in the coop, I was able to keep an eye on the internal temperature, which at it's coldest was 29°, which is no problem for most chicken breeds.
I might add that this was with a dormer vent and one window open to insure ventilation.
So, I'm not sure about how well it works under a desk, but in a coop as an alternative to dangerous heat lamps, it's a winner.

My floor is chilly, my room is admittedly drafty, but the heat from this thing is only detectable if I put my bare foot right on the surface, and then it's a little too hot for comfort. Ridiculously impractical. I also bought the separate stand, which was not the greatest quality BTW. It holds the heater right next to my legs, and still I cannot feel a bit of heat! If I can't send this heater back (and I guess I don't know on what grounds that would be, since it's probably not defective, just utterly inadequate for my workspace), maybe I'll see if I can use it in a DIY kotatsu. Not happy though!

Last year, for another space, I bought an Econ-Heat wall panel. In comparison, that one works great to heat up a small room. Of course, the EH has higher wattage than this CL product. Silly me, I thought they'd perform in a similar way, and that the CL would be great if it were right next to my legs and feet. Nope.

Got this to heat up our dogs kennel in winter. It doesn't put out a lot of heat, but the panel is merely hot to the touch. Your pet won't burn himself by bumping it. It you're more than a couple feet from it you won't feel anything directly, but it'll take the edge off in an enclosed space. Think of it like add 2-3 extra large dogs worth of body heat to a space. The mounting options that came with it are crap though. I built a wooden frame to contain it and prevent it resting directly on the cage.

I was looking for an economical way to give my birds some warmth in the winter months. I bought 2 of these and my husband and I hung them on the back of my bird cages with wire. We used aluminum rods @ 1" width and ran wires through them that we used to tie them to the cages. We placed a rod at the top and bottom between each heater so that there is a little space between the heaters and cage bars. I have Quaker parrots and Indian Ringneck parakeets. They do well in extreme temperatures when introduced gradually. I plan to keep them in an insulted room our garage all year. I thought my birds would enjoy a warm area in their cage. For the price I think these heaters are better and cover more area then expensive heated perches and heaters made specifically for bird cages. These are working out very well so far. They should be inexpensive to keep on in the colder months. When left on all day and night it takes the chill out of the garage room that is @ 14' x 18' . I expect that these 150 watt heaters should help with keeping the birds water from freezing also.

i bought this for my chicken coop and am very happy with how it performs. I used a thermocube to plug in with so its not on all the time. But it is working well to keep them cozy when it gets super cold. The sticker/Velcro tabs provided for mounting on the wall did not work even with proper preparation. But that's okay. I devised an easy way to mount it and have had no problems yet. I purchased this based on the other reviews that used it their coops and am glad I did...and so are the girls.