home heating

tom mcintyre

i've been asking about this for years without much luck, maybe someone there could provide an answer. compressed air in diesel engines creates a tremendous amount of heat in their cylinders 18:1 = 1200 degrees to ignite fuel, etc.
question 1 - how long can this compressed air retain its heat while being compressed? air conditioning works on just the opposite if not mistaken, after being compressed the expanding gases from being compressed turns cold. the
point of all this, question 2 - if compressed air could be compressed once and retain its heat or compressed over and over, again and again, as a compressor works can heat be taken from the result of this air compression process and
hopefully energy source ?
if you get a chance would appreciate a reply tom mcintyre