One thing to note, for future reference if you ever have it agai, or for those reading this. Te main reason to raise the temperature while treating ich is to speed the life cycle of the ich. It would be best to either add the salt first , the raise the temp, or do them simultaneously. I personally have never raised the temp in my tank when treating for ich, takes longer for the ich to complete its cycle..thats just a preference I have as I have no heaters in my tanks. Raising the temp alone will kill the ich if held at a certaing temp (84 i think) til seven days after all spots are gone. It would be virtually impossible to be certain your temperature hasn't dropped without special equipment to test the temp of the water, and lots of fish don't do well with temps that high (goldfish for example).
In simple terms, when using the salt heat method, the salt is used to kill the ich, the temp is raised to speed the life cycle of ich and is not a must (will have to treat for ~ an extra week if temp isnt raised)
Blue