What type of return is sufficient for air movement in small houses with limited conditioned area?

A central return is considered sufficient for air movement in small houses with limited conditioned areas because it efficiently serves the entire space from a centralized location. In smaller homes, the layout typically permits effective air circulation through a single return, which can pull air from various rooms into the central return duct. This helps maintain balanced airflow, ensuring that conditioned air is evenly distributed throughout the home.

The design of a central return also helps simplify the HVAC system, making it easier to install and maintain. While multiple returns, wall-mounted returns, and floor-mounted returns can be effective in larger or more complex systems, they may not be necessary or practical in a smaller home with limited space. These alternatives often require a more intricate duct design and can introduce additional costs and installation challenges that are not justified in a compact environment. Thus, a central return is the most appropriate choice for ensuring adequate airflow in small houses.