PV Gap

Toni Said:

how much would it cost to reduce the carbon footprint of your house?

We Answered:

That has a lot of variables certainly though you would expect compensation in the form of savings from your insulating and glazing much sooner than the exorbitant costs of solar and wind.

Each house or location has to be evaluated as to expected energy consumption, Amount of solar or wind energy expected.
Sites like I source can give you an idea of the proccess needed.