A heat pump circuit is installed into the inner cavity of a chimney servicing
a
dwelling with the exterior heat pump coil mounted in an annular gap formed around
the upper chimney end. A fan driven by the chimney draft then rotates an exterior
rank of blade segments above the annular space to draw ambient air across the exterior
coil. A set of gated apertures in the chimney wall both above and below the flue
damper then directs zoned airflows up into the chimney and across the inner coil
that is deployed at the lower, interior chimney opening.
