A device using high pressure air to create to both heat and cool If you take a normal air compressor air outlet nozzle and hold it between you fingers and try to restrict the air flow you will notice the pressurised air become hot and you will not be able to stand to hold it for long. In this device air is forced through the centre potion of this gun and air flow is restricted in one end by adjustable screw at one end producing extreme heat whilst at the other end cool air is produced. The placement of the air flow in the centre is critical and some practice and experimentation may be needed to get this device to work. This device has been incorporated in air conditioning system but found not to be efficient compared to other methods at present. An interesting device never the less
