How is ambient energy relative to whether a reaction is spontaneous?? Does Exothermic reaction that is self-sustaining not have any ambient energy?

I don't know but if there is a higher amount of ambient energy is the reaction spontaneous? I don't think a exothermic self-sustaining reaction has ambient energy since, it is mostly net energy right?
Thanks for the help.

First, I know very little about the term "ambient energy". As I understand it. a wind up system can ge used to store energy in a battery fashion and that in turn can be used to light LED for a room or run a computer monitor display. In that case you are turning mechanical energy into electrical energy and no chemical reaction is involved except for the battery charge and discharge. The charging cycle, of course, is endoergic and the discharge cycle is exoergic. It appears to me that if we think of ambient energy in terms of potential energy, the an exothermic reaction has the ability to do work so it contains potential energy until it is "turned on". Others more knowledgeable about ambient energy may or may not agree.