This invention provides a primary uniform heater in the natural temperature preserving main body (100,200) and it is conducted to a room needed to be heated, where the temperature can disperse openly; the temperature is transferred by the heat-conductive fluid by a main pump (104,204), or further by a shunt pump; that is, fresh air enters into the primary uniform air-heater through an open filtered inlet, and enter the primary uniform heater of the natural temperature preserving main body (100,200) and then it is pumped through a transfering tube (102) to a detector in the room needed to be heated. If the conductive tube (102) is long enough to be buried in the natural temperature preserving main body (100,200), the primary uniform heater (101,201) can be omitted and the tube (102) is made of good conductive materials to actuate the function of a primary uniform heating power; a primary filter (106,206), such as active carbon filter, tester for harmful gas (1081), and air fresher, can be attached to the inlet and the outlet of the fresh air.