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I agree - Check the insulation.
I replaced my insulation and ran nylon string in a perpendicular direction to the joists while using roofing nails to 'wrap' the string around as I went (to hold the insulation up. I used Kraft-sided insulation with the Kraft facing UP towards the heated floor.) The duct, itself, should be insulated independent of the floor. You can find duct insulation in the Home Centers.
Also, depending on where you live ..., if you have vents in the crawl, you may be OK to close them in Winter. Do check around.
My best to ya and hope this helps.
Jay J -Moderator
PS: Forget heating the crawlspace. If you want a REALLY warm floor, look into a Warm Floor System. They're AWESOME. I'd do this as a LAST resort since you really won't enjoy the full benefits of it sinc you'll only be 'using' it during sleeping hours. Don't misunderstand me - That's nice. But a warm floor system is really 'cool' underfoot.
PPS: God bless America