heat mats dont heat the air they heat the subtrate/tile/hide on top of them. corns are fine to get there heat from the belly up. if you wish to heat the air you will need either a ceramic buld, heat bulb or a reptile raditor
as long as my corns happy im happy just wanted to be sure because i got given him the previous owners used a lamp but ive decided to use the mat because its cheaper on electric
as long as the temps are fine the snake is feeding fine and there seems to be no health complications your snake should be fine. have you got your mat on a stat?