What Is the Disadvantage in Having Ducts in the Ceiling?

Cons of ceiling vents

Exposes HVAC system to unconditioned spaces – Attics tend to be dusty and prone to extreme temperatures, which can add wear-and-tear on the equipment and increase heat transfer loss.

Is it better to have vents in floor or ceiling?

Ceiling and floor vents are equally as efficient, but floor vents can be slightly more efficient by providing less resistance to airflow. Ceiling-mounted vents generally have better cooling potential, whereas floor vents typically provide greater heat transfer.

Why does my house have vents in the ceiling?

Ceiling Ducts for Cooling

Because cool air naturally sinks, ceiling ducts are preferable where air conditioning takes precedence. Cool air entering through ceiling ducts quickly descends to the lower portion of the room where people are located. Comfort control is more immediate and continuous.