Hi, We recently moved into a house built in 1998. It has an open great room with few vents and the thermostat is in one corner of the room. Because of the thermostat is in the great room the furnace is turned on quite often, eventhough the other rooms in the house have comfortable temperature. The current temperature setting is 67 F. If we bring the temperature below this the great room is very cold. How can we solve this issue?