Place your cold air return vents on the inside walls of buildings at the lowest point.
Central heating air vent location.
Ducts should always be located within the conditioned envelope of the building ideally within the framing of floors ceilings and walls and they should be maintained so air does not leak out of.
Some systems have two sets of return vents one up high for warm air and one low to the floor for cool air.
Try to avoid doing this to your vents as it will reduce their efficiency.
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Many have duct work in crawlspaces so the registers are placed in the floor.
Unlike supply vents return vents do not need to be cased in metal.
Sometimes vents get blocked by rugs couches or the like.
The return vent pulls cold air from the bottom of the room and returns it to the furnace to be reheated and returned as warm air.
For the best energy efficiency what is the optimum place to put the vents in each room for the new a c forced heating system ceiling high on the wall.
Attic systems may use registers placed in the ceiling instead.
The low vents stay closed in the summer and the high vents stay closed in the winter.
In this case their height will be determined by your system.
If it s cooling the return vents should be near the ceiling where the warm air collects but if.
The supply vents which push air through the duct work must be placed properly.