Ok so I have a question and comment in one. Your oldschool sterling engine changes temperature differences into mechanical energy. My theory is in the winter, when you are heating your home anyways. Can you use the temp difference between the cold outside and the warm inside to produce electricity? Is the temp difference big enough?

I am fully aware that you will never produce the amount of energy that it took to heat the house but your using the heat for another reason entirely, to stay warm.

Also it may work better if applied to furnaces and ovens directly. Let the heat pass over the engine as it makes its way to heat the house.

Appreciate the feedback.

Perhaps one could attach a wind driven turbine to the output of the ac/heater... perhaps a reconstructed blower itself... Heck of an Idea to toy with.

Though this may look good at first glance, the flow of heat from warm to cold (to power the engine) will only cause the need for more heat production for the interior.

Short story - you won't save any energy. In fact, you'll likely lose in the deal due to conversion losses.

Now, if you can use heat normally lost through a chimney, that's a different story....