First off, you're jumping the gun. You need to allow your beers to sit for a few weeks before worrying about it. The airlock is NOT a good way of checking whether it's fermenting or not. Even if it's not bubbling, the yeasties could still be hard at work.
As for your temps...depending on your style, it's probably fine. For future reference, it's not recommended that you move a fermenter from a warm enviornment to cold. If it's going from cold to warm, it's fine. Unless it's a lager, just let it finish out at the higher temps or you'll risk confusing the yeast into settling out early.
As for your krausen...some yeasts work fast, some don't.