you can use ash techniques to make like something like the a dust storm to make it difficult for them to see, the ash could be hot and burn the opponent but it would do that to you too? and you could ignite it any time you wish.
normal fire can be used to make mist, umh... have almost a solid like form like some canon techniques so they can punch through solid techniques.
you cant use heat only since it is temperature release i presume, am i missing something O_O