if your house has doors and you close them on the bottom floors the heat will rise far faster than any from heat scavenged from upstairs
Thank you for the interesting thoughts, is that right that heat from down stairs will rise faster if the doors are closed? It is pretty open plan downstairs however we do close the doors so the stairs are isolated. Orginally I had hoped to see if there as a way I could redistribute some of the excess heat from upstairs back down rather than just venting it, and producing more downstairs.