When you are in a hot room and turn on a fan, why does it feel cooler?
605559
It does heat up the room, but it has two other effects: the constant stream of relatively dry air it evaporates moisture from your skin faster. Also conduction.  If the air and you are still, the air right next to your skin will be a bit warmer than the air further away, because it is colliding with your warm skin and takes some heat from you, but warms up in the process.  Cooler air blowing past will conduct heat from your skin more efficiently.\n\nThe molecules in water move at a variety of speeds. The "average" speed determines the temperature (it isn't exactly an average, but sort of is) but some move faster and some mover slower.  The faster ones escape and go flying into the room, and that brings the "average" energy of the water left a down a bit. This is why when you are wet after bathing, a humid room feels MUCH warmer than a dry room that is the same temperature; water molecules in the air stick to your skin just as often as the quick ones leave.  In a dry room this does not happen so the net effect is the higher energy (faster) water molecules leave preferentially and what is left is a bit cooler.\n\nIf the air is still, you end up with a bit more water in the air right next to, kind of like being in a humid room.\n\nThe second reason, increased conduction is similar, except the air is warmer right next to your skin because air molecules near your skin tend to collide with the ones IN your skin.  The ones in your skin, being a bit warmer, tend to lose energy to the air.  It cools, and the air warms, BUT conduction is more efficient when the temperature difference is larger. So, once the air next to you warms up a bit, you lose heat energy more slowly. Now, if you have a breeze, there is a steady supply of cooler-than-next-to-your-skin air coming in contact with your skin, so the cooling rate is larger.\n\nYou are correct that the fan will on average heat the room up more, but your body may end up cooler.\n\nThis reminds me of people who sit in front of the refrigerator with the door open on a hot day.  You might feel cooler, but the inefficiency of the fridge compressor means more heat goes into the room than the room is cooled off, but you, being right next to the fridge will be cooler perhaps than otherwise.
765995
I would say "Please turn the A/C down" if I wanted the room to be warmer, since the A/C cools the air, and the more it's turned up, the cooler it makes the air.\n\nAnd to answer your last question ... ALL THE TIME! :)  Whether it's A/C or something else, often two people will have different ways to say or ask the same thing, and one or the other of us will have to clarify.  I don't think that's just you or me, but happens to everybody at one time or another!  \n\n.
379311
sundevil is right, it has to do with the ability of matter to conduct heat away from your body. Since your body is always generating heat by cellular respiration (your cells burning food in order to function), your body will increase in temperature if there is nothing to take away the energy, causing you to feel hot. Gases are poor conductors of heat, so they have to be much cooler than you to be effective coolants. Once you transfer some heat to the air near you, that air has to transfer heat to other air near it before it can absorb any more. Gas molecules are far apart and  transfer energy betwen each other much less than solids and liquids. Your body will keep making itself hot faster than the air can cool it down. Liquids and solids have much larger heat capacities, so they can absorb energy without much raising in temperature and are much better conductors of heat, transfering energy to other molecules so they can absorb more.
876859
Heat is actually a feeling and that has something to do with brain.
1031711
Your body is an engine which continuously produces heat, so it needs to stay in an environment cooler than itself to stay comfortable. \n\nEnergy flows from high to low (or in this case warm to cold), and there are ideal temperatures for your body to operate at. If it's too warm outside then your body can not cool itself as efficiently, so it is uncomfortable. On the other hand, if it's too cold then your body is giving off more heat to the environment than it can generate to keep comfortable. For many people this "ideal" temperature (room temperature) is about 68-72 degrees Fahrenheit, but based on a persons ability to generate heat and their circulation, this value will change.
587432
Colder air is "thicker," moves much more slowly than does hot air, and is heavier than warmer air...Air will set up a gradient from the coldest at the bottom to the hottest at the top in a container...
861849
The fan on your desk takes energy in the form of electricity out of the wall socket. At the motor this energy is transformed into rotational kinetic energy that moves the shaft and the fan blades around. The shape of the fan blades cutting through the still air transfers energy into the air to make it move also.\n\nThere are more energy transfers taking place when that moving air hits your face and makes you feel cooooool.
1009034
No.\nThe computer works better when it is warm.\nIt's a hardware thing.
615523
There is a fan in your PC that cools down your computer since keeping it on all day will heaten up your hardware. It is probably defective.
787743
my room is so hot coz its my room!!! im hot!
1159227
As a general rule, warm air rises and cool air sinks\nit expands and becomes lighter as the molecules of air move farther apart
440343
There are several fans inside for cooling.  There is one on your processor (the actual computer chip inside), power supply and probably your video card.  If you are just beginning to notice it, there may be a cable or something that is brushing against the fan.  You might consider opening the case and just making sure nothing is rubbing.
552768
If you're using a laptop, your battery is probably dying or the cooling fan isn't working properly. You'll need to take it to a shop to get it cleaned properly - don't pop the case open yourself.\n\nIf you're on a desktop, you're probably overheating, either the power supply or the CPU. You need to open the case and blow out all the dust, especially around the CPU and fans, and make sure your fans are running properly, especially on your power supply.
776045
When air is warmed up, its molecules move faster and faster and as a result they move further from each other.  They still have the same mass, but they now occupy a larger volume.  This means that its density is smaller.\nThe opposite when air is cooled off.  The molecules slow down, get closer together, occupy a smaller volume and therefore its density is bigger.\n\nWhen air is warmed up, it goes up.  Once it's up there, is cools off and goes back down.  Near the heated surface the air gets warmed up again, goes up, cools down, goes back down, and again and again.\nThat's called a convection cell.
1170375
That could happens in some fans because they come with a special  switch to  change the rotation of the blades. The  warm air always are near the ceiling where the fans is and the cold air is at the floor level.During the winter what the fan do is  generate  a circulation path from  top to bottom like a clockwise movement from the floor to the roof bringing  the heat to the floor; on the  summer, when you switch the rotation,  you invert the process. When you go to the store you can see a diagram on the side of the box that illustrate this...
1093016
Did you check the fan? It may be getting overheated for some reason.
15646
Humidity adds to the heat as well as the cold. \nIf the air is saturated with water, and it's also cold outside it will make it so much colder. When it's hot outside and there's high humidity it also makes it hotter, you wouldn't think so, but it feels a lot like a sauna.