Stink bugs

We live in the NNE suburbs of Philadelphia, PA. The last few years my vegetable garden has been overrun with stink bugs. I try not to spray as much as possible but have even resorted to this to try and cut down on the population but to no avail. During this past winter, I've had very large stink bugs just just show up inside our home. We totally cleared the vegetable garden this fall and put this in the composts. My composts are holes in the ground. The top of the compost piles are chopped up leaves from the fall.
Does anyone know why I'm getting overrun with these beasts? Any ideas for cleanup? And why would they be showing up in the house in the middle of the winter?
Thanks for your help.
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