Welcome to ATP,
lthomas56 !
We added a sunroom to our house a few years back -- mostly because summer often means too many mosquitoes to enjoy actually sitting outside! One problem I've had in terms of even overwintering plants such as geraniums (Pelargoniums), as well as with seedlings, is that we used windows with "low-E glass," which is great because the sun isn't so harsh coming in during the summer, but not so great for the plants, which tend to grow leggy and weak. Here in the north, though, our winter sun is at a lower angle than where you are, so that might make a significant difference as well, but you may find it necessary to supplement with fluorescent lights for seedliings.
