Good question. The uniform temp is really within a room, what you're describing is the not uncommon experience of having unbalanced duct work. A few options for

Good question. The uniform temp is really within a room, what you're describing is the not uncommon experience of having unbalanced duct work. A few options for you (1) DIY or pro duct balancing. You change the position of dampers and vents, might have to modify duct work (2) actuated zone dampers, these live in the duct work and install is expensive (3) a smart vent that you can DIY, battery life is surprisingly good https://flair.co/ https://flair.co/ (4) mini-split system, every major room gets a wall unit connected to an outdoor unit (condenser), and you can control the temperature of each room the mini-split is in. Electric Air offers wall units for this if you're not able to make a ducted install work. (5) hybrid setup, you use a centrally ducted furnace for most of the house, heat pump or otherwise, and use a mini-split in the upstairs rooms that are not reaching the desired temperature.