I think growing them in my greenhouse last year made a huge difference. They stayed much warmer at night then they would have outside. My plan is to devote all the space I can in the greenhouse this season to just peppers after I move the other plants outside around mid-late May.
I was thinking of buying a The Affordable Hobby Greenhouse from Growers Solution (10x12) for more greenhouse room. It sells for $599, but I could get 10% off, but they want $430 to ship it!
I'm going to keep looking.