For cooling ceiling would be better.
Hvac ducts ceiling or floor.
Heat vents are better in the floor if possible.
Functional troubles such as lack of air flow or collapsed ductwork and environmental problems such as radon odors flooding mold insects and where transite cement asbestos ductwork was used asbestos particle contamination.
This isnt the main concern however.
The placement of your return is.
As warm air rises cool air falls so the cool air from your ceiling registers will pass through your whole living space instead of pooling near the floor.
The optimal placement of hvac supply registers in your home or building depends upon the building s design and your unique comfort needs.
Neither is better per se.
Ceiling ducts for cooling.
For example owners of multiple story homes might use a combination of floor ducts for heating and ceiling ducts for cooling.
In some situations such as when the ducts must run perpendicular to floor or ceiling joists the ductwork can t be fit within the framing of the building.
As for pros and cons of either.
Because cool air naturally sinks ceiling ducts are preferable where air conditioning takes precedence.
Homeowners can also combine the two types to generate the best efficiencies.
Which is better hvac supply registers grilles in the floor or the ceiling.
The physics reverse when it comes to air conditioning.
Vents in the ceiling will work.
In climates where heating is the predominant hvac function floor ducts are usually preferable.
Is there even a difference between hvac supply registers grilles in the floor or the ceiling.
Cool air entering through ceiling ducts quickly descends to the lower portion of the room where people are located.
It may not be possible to install them in the floor or the additional work required may make it cost prohibitive.
In a warm climate where you need cooling most of the year ceiling registers are generally preferable.
For heating vents in the floor would be better.