A/C options:
1. Air movement:
a. Natural circulation (cold air drops down and hot air rises)
b. Forced by a Fan, i. in a window mount or ii. tower fan.
Air movement can cool off your house in the evening. Air moving over water, picks up moisture and can have a cooling effect.
2. A/C
a. A room/window A/C with the exhaust going out the window, (make sure the window is sealed good so hot air does not come back in and there is a place for moisture to be drained to)
b. Split units, a heat pump that pumps refrigerant to a split unit in the room and the refridgerant takes the heat from the room outside to the main unit.
c. For houses with oil/electric furnaces A/C can be installed in the output side of the furnace that takes air to the house.
The dyson air fan (yes those 550-750 fans the clean, and supply cool air and or heat the air): Does anybody know how on what principle it works to cool the air?
The only thing I can guess at it uses a Restriction (all those little holes putting out air at the fan output), using the standard gas law PV =nRT . As air passed through the nozzle(hole) the velocity of the air speeds up and you have a drop in pressure, if the pressure drops so does the temperature. So its like any other fan it just moves air around.
In thermodynamics if the motor of the fan is going and the room is completely sealed off, all the fan (fan motor creates heat) will do is increase the temperature of the room because the motor is running from the electrical plug.... energy transfer is from electrical to mechanical to heat. In thermodynamics heat moves from one place to another.... so with the dyson fan where does the heat in the room go to?
So why are people paying 500.00 for a fan that just moves air and really doesn't cool off your room. its no better than your standard fan that blows air in the room.