[asquabventured]

Large ceramic indoor potted plants are wonderful thermal mass vessels.

[wolverine876]

Do you mean real plants in a ceramic planter? Why is that better than furniture or rugs, for example? Water content?

[asquabventured]

Three dimensional volume for one. Ceramic and soil also will hold the heat you get from sunlight and radiate the heat back out into the environment.

Thermal mass is the key and potted plants provide that with the large volume of soil combined with the ceramicpot that if placed into sunlight will absorb the energy and radiate it back out and keep the room warmer.