Hi Stephanie, My GH is only heated slightly with heat bulbs when I want to add about a degree or so and they do increase the light on the baby seedlings. It's about a 12 x 30 with the North side against the back of the storage shed. Since one side is closed to light, I get most of my light from above and the 30' on the South side in the winter really gets a lot of light. When the sun is shinning it will raise the temps in the GH by about 15 degrees from 50 outside to 65 or so inside. This is an average winter day for us. The only bad thing, in our winters, it stays overcast a lot, so I don't get the sunshine heat everyday. Now, in the summer, the sun will raise the temps over 20 degrees if the doors are closed. This is when my GH being on the South side of the shed helps. It keeps it cooler since the sun in the summertime is way North of the shed and doesn't shine into the GH directly but just a few hours aday.
I've been out in the GH the last 3 weeks nearly everyday. Since I have used up most of the space for my seed cups to set, I can't plant anymore seeds until the ones growing get big enough to put up into gallon size pots and can be put outside safely. So, this past week, I've been working on getting the rest of my pots repotted that are outside. Last week it was really warm inside the GH. We had one day over 70 degrees outside and its in the upper 80's inside for a while that day. I was sweating and it felt sooooo good!! Now this week we haven't had any sun at all so it's basically been the same temp inside and out which has been from 41 today to about 55 earlier in the week. It's comfortable in their since the wind isn't blowing inside as long as I'm working on repotting the plants. Sometimes it will take as much as an hour or longer just to get the roots apart on the 4 or 5 fans in a 3 gallon pot. The more fans of course the longer and worse a mess I have. I treat the plants like glass and try not to break anymore roots than possible, but sometimes it's just not going to happen. I have to break the plants apart with my knife or pry bar that I use. I have a set of different size very small, maybe 6" to about 20" pry bars that I find very helpful in getting some fans apart. I use the smallest one some to get the soil off but I have a metal oyster tool that I use most of the time to remove the soil and to get the roots apart. Most of these pots haven't been repotted since 2007 and 2008 and few from 2006. So, needless to say, they reallllly need it!!
One that I did today had 6 fans in a 3 gallon pot. It took me nearly an hour to get them clean. 3 of the fans had a stolon growing from the crowns. I was lucky enough not to break them off before I found them. It's just plum neat the way they grow out the side of the crown. One of the stolons was about 8" long and was beginning to turn upwards in growth. The other two were still very small, only about a half inch long and they hadn't yet turned to grow out from the crown. This is one thing that I get to see by growing in pots that most wouldn't get to see growing in the soil.
Have fun, Mona
My daylilies are either still sleeping or looking like the pile of mush that evergreens tend to look like at winters end for me. I can't wait to see pics of your blooms this year 
And here is a Pic. of seedliongs that year 2010.
