Need Help With Insulating Ceiling Of Enclosed Porch

Hi,
I have a room which is about 14 x 10. It used to be a porch, but the previous owner enclosed it. The room is finished with drywall for both the walls and the ceiling. The room has 6 windows and large sliding glass door which lets in a lot of light. Currently there is no ductwork run to the room, but I plan on having this done when I get my furnance replaced. The problem I have is that I was working on installing a ceiling fan in the room today, and upon removing the old electrical box, I peeked up into the open space to find that there is no insulation in there. Obviously this could be a major problem if I wish to heat/cool the room. So at this point, I'm thinking I have two options: 1.) demolish the ceiling, insulate as necessary, then put new drywall up (not an ideal option to say the least) or 2.) use a loose type insulation such as cellulose and spray it into the ceiling
The roof over this area is slightly angled. Then there are joists that run parallel that the drywall ceiling is attached to. Because of the angle of the roof, it appears that there is open space between the roof and the joists. Would I be able to use the hole (about 4" in diameter) that is currently exposed for the ceiling fan to blow cellulose insulation into the ceiling? Would there be any reason I couldn't do this? What about a vapor barrier since I can't actually put anything down as I don't have access to the entire ceiling? Also will ventilation be an issue? Any other suggestions on how I could approach this?
Thanks.
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blowing insulation is a good option. You can use that 4" hole and fill it up. Drill the same hole under each section of joists. Then you can patch it back up when you're finished. You may want to calculate how much cellulose insulation each section should hold, and then make sure you use that much per section. That way you ensure that you get enough in there.
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