The Old House Eco Handbook seeks to answer the questions homeowners and others are asking about how to make their old houses sustainable and energy efficient. The need for sustainable, energy efficient buildings is non-negotiable. Energy efficiency is vital to cut carbon emissions, a major contributor to global warming. While old houses are, by their nature, a sustainable asset due to the embodied energy contained within their structures, they are not usually energy efficient. For homeowners the question is how should they go about this without devaluing the future sustainability, value and character of their homes due to the use of inappropriate solutions.