Dehydrators work. I just use the oven though, on the lowest setting. However, with peppers; your family will most likely be very unhappy with you.
What I do to asist the drying process is cut the pepper lengthwise and spread it out so that is lies flat. (strips work well). Then, lay the peppers out on a sheet of parchment paper on a cookie sheet (or just in your dehydrator) and dehydrate for about 12 to 18 hours.
Keep checking... might even take a little longer.