We have an older home (1964) with a newer heat pump, 4 to 5 years old. It is a two story house with one unit. Upstairs the duct work is in the ceiling with the vents located in the middle of the room. Would it be worth moving the duct work so we could install ceiling lights/fan. If we do move should we move the duct work near the windows or do I need to call a heating air guy