Hello all, I am currently converting my garage into a living space and I will be adding an HVAC duct line to this room from the main. I have a few questions and I have pictures to accompany them: 1. Attachment 1: Supplies for the rest of the house overtake the whole supply section of the furnace so I cannot pull a new line directly from the furnace. Can I pull the line from Attachment 2 (before fork) or Attachment 3 (after fork) locations? 2. What should the diameter of the new line be considering the fact that both supply and exhaust lines will have to fit through a 9"x 12" opening in a crawl space (Attachment 4)? 3. After the crawl space, there will be an opening under the floor (between concrete and sub-floor) into the garage for the new supply line between one row of joists and for the new exhaust line between another row of joists (Attachment 5 -- only supply line shown). The joist opening dimensions are 4.5" x 14" (Attachment 6). Considering this, what should be the dimensions of the duct line through here? Also, what would be the transition fitting between the crawl space line and under floor line? 4. In the garage there will be spray foam insulation in the floor. Do I still need insulated ducts for the supply and exhaust line considering the insulation can be sprayed under the duct? Attachment 7 I really hope that I didn't make it too complicated and if you have any other input, I would appreciate it. Thank you!

I have an old Trane XL90 furnace/AC unit. The fan runs but you the condenser never kicks in to pump cool air. Where do I start to trouble shoot before calling a pro? Thermostat, outside unit, etc? [IMG]https://i.imgur.com/DahWyri.jpg[/IMG]