Growing out tomato seedlings in green house

[snappybob]

This year I was wanting to grow my seedlings in a green house. I plan to get them started inside under lights and then move them outside in the green house. I would bring them in if it was going to get too cold to manage the temperature in the greenhouse overnight or if we were experiencing really cold weather. My reasons for this are because I am running out of room inside and I am trying to get stalkier, stronger plants. I read an article on the web last year about how professional nurseries start seeds in warm conditions and then fairly quickly move the seedlings out into greenhouses for their sunlight but the temperature was fairly cool. I thought I had saved the link to my favorites but I can't find it now. Does anybody know where I might find this information.
Thanks