Clothes dryer not drying?

I have a Roper dryer and everything seems to work like it always has (tumbling, heating), but it just isn't drying anymore. I checked the lint trap and the hose and there is nothing clogging either of them. The clothes washer is also spinning just as it used to, so that is not the problem either. Any thoughts before we shell out a bunch of money on either a repair or a new machine? Sorry, but I don't have the model of the machine in front of me. Thanks!