Though it is not technically correct scientific notation, you can think about heat like its own species in an equilibrium equation. If a reaction is endothermic, ( H>0), think of heat as a reactant, and when exothermic ( H<0), consider heat a product. This makes the application of Le Chatelier's Principle much more straightforward, as a change in temperature can now be contextualized as a change in a reactant or product, which I personally find easier to contextualize.
For instance, take the endothermic reaction
. This can be rewritten in the terms explained above to be:
For this new equation, an increase in temperature --> an increase in heat; thus product formation is favored. If temperature is decreased, heat decreases--> reactant formation. It's that easy!