Tjernlund Products' AireShare transfer fans let you move heated or cooled air from one room or level of your house to another.
The fans help share warmth from such sources as fireplaces, stoves and electric baseboard heaters, as well as coolness from room air conditioners.
Room-to-room models draw air into a wall cavity and send it out through an air diffuser on the other side of the wall. Level-tolevel models move air through a sleeve between floors.
The fans are available at tjernlund.com/retail.
Room-to-room fans sell for $189.95 for a hardwired model or $229.95 for a plug-in type. Level-tolevel fans must be hardwired and sell for $229.95. Shipping is extra.
The company also sells its products to contractors through wholesalers.
