Thanks for all the suggestions, guys. I will hunt around for vents I can close today, for example my sisters' room backs right up to the HVAC unit so they could probably do with a little less power to their room.

Capn, my windows take up a good portion of one wall in my room, so with the temps outside, I can't tell if the glass is cold or if there are actual drafts. I could probably caulk up all the sealants to be sure. I already have triple-cell sealant tape along the inside of the opening section, but I'm not sure it's actually improved the seal any.

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