OT: Uneven Heating... Recommendations?

[Dave]

If the duct to the room is accessible, a booster fan in the duct might help. There are a lot of electric heaters made that plug into a wall outlet and really can add a lot of heat to a room. Most would be perfectly safe placed on top of a dresser.

[paredown]

Agree with the criticism of the HVAC folks, and a close second would the crappy insulation installers, followed by the guys installing windows and doors who haven't got a clue...

[Tandem Rider]

If the room is cold in winter, there isn't enough heat getting to the room to overcome the heat loss from the room, I know, duhh. The camera is an excellent idea, it might tell you more than you want to know. Temporary "fix" might be to toggle the fan onto continuous run. You really need to fix any obvious issues with the building itself first and couple that with inspecting your ductwork for any issues. Get up into your attic and look around for insulation pulled back or missing. Check your basement or crawlspace to make sure the box sill got insulated. If that doesn't resolve it, then pay to have a heat loss calculation done and the airflow into each room measured, not guessed at.