New answers tagged troubleshooting
Start troubleshooting with any recent fixture, switch, or outlet work on that circuit. Then trace the problem circuit from the main box outward removing every junction faceplate and inspecting. Jiggle and twist connections while looking for issues. It may be resolved just by a few turns here and there.
If the vents are blowing the room temperature air weakly, then it sounds like there may be a duct disconnected somewhere that's blowing most of the hot air somewhere that's not useful (into a corner of the basement, into an unconditioned attic, etc). I'd trace the duct path from the furnace to a register and see if you can see where any disconnections might ...
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