I know this sounds funny but it is very true. My downstairs will be 80 and upstairs is like 65. I Live in Minot ND. It gets around -60 in the dead of winter. But I have a problem with heat upstairs, I have closed all of the vents downstairs and have all of the vents open in the upstairs. I live in a duplex w/out a basement. The furnace is on the floor with the living/family/kitchen/dining rooms. My thermostat is downstairs as well. I can never seem to get upstairs warm can someone help me. The house is brand new. I am the first person to own the house. Any help would be great. Thanks in advance.