So I have a 3 bedroom home. One of them is the master, one is the guest bedroom/office/pet room, and the third is for the baby that is on the way. So I have pretty big garage that I don't keep my cars in and would really like to use it to start seeds in January and keep them there till plant out in late April/early May. The temps outside at that time of the year are anywhere from the low/mid teens to mid 30s. Sometimes it even gets colder. I am not a carpenter, but I have access to just about any tool I need and I am pretty confident I could assemble some sort of structure. If not I have buddies that are very good and they work for 
My questions are:
1. Does anyone have any experience with growing in a cold garage/space? Germination, seedlings, etc.
2. What kind of setups could potentially work to achieve a relatively steady heat? Insulation, space heaters, extra lights?
3. Any other tips that I can use? I have about 4 and a half 5 months till I plan on starting, so I have time to gather materials, start construction and test.
Thanks for any help.
Matt

My questions are:
1. Does anyone have any experience with growing in a cold garage/space? Germination, seedlings, etc.
2. What kind of setups could potentially work to achieve a relatively steady heat? Insulation, space heaters, extra lights?
3. Any other tips that I can use? I have about 4 and a half 5 months till I plan on starting, so I have time to gather materials, start construction and test.
Thanks for any help.
Matt