Warm(er) air rises - if vents were high up there would be little circulation without fans.
on the floor on the floor
There are heater doors on the heat blower box that direct the path of the heat. Apparently the heater door to the floor vents is stuck closed.
should be on floor.
Convection is the heat transfer process that causes heating vents to be placed on the floor of a home. Warm air rises, so by placing vents on the floor, cold air is drawn in from the lower part of the room, warmed by the heating system, and then rises to heat the rest of the space.
yes
Heating vents are typically placed on the floor of a home because hot air rises, allowing the warmth to circulate effectively throughout the room. By releasing heated air from the floor, it promotes better distribution and ensures that the upper areas of the room also receive adequate warmth. Additionally, floor vents are less likely to be obstructed by furniture, maximizing their efficiency in heating the space.
the middle vents only supply air from the ac unit using a separate in dash fan. the floor and defrost vents come only from the heater
Heating vents are typically placed on the floor of a home because warm air rises, allowing the heat to circulate effectively throughout the room. By releasing heated air at floor level, it creates a more even distribution of warmth as the air rises and mixes with cooler air above. Additionally, placing vents on the floor helps minimize the disturbance of airflow from furniture and other obstacles, enhancing the overall efficiency of the heating system.
Ceiling. Cold air fails
radiation
Most likely a bad or disconnected vacuum hose to the defrost/floor selector in the heater ducting.
Heating vents should be placed on or near the floor because heat rises. In rising, it will warm the air of the room. If the heating vent were near the ceiling, the room would stay chilly, even though heat was being poured into it.