The specific job title of a person who can help you improve the energy efficiency of your residential building would likely be an "Energy Efficiency Consultant" or an "Energy Auditor". These professionals are trained in assessing the energy performance of buildings and identifying cost-effective measures to improve energy efficiency. They can provide you with a comprehensive energy audit report that includes recommendations for improving the energy efficiency of your building, estimating the potential energy savings, and calculating the payback period for each measure.

You can also contact a licensed contractor who specializes in building energy upgrades and retrofits, such as a "HVAC Contractor" or a "Building Performance Contractor". These professionals can provide you with a detailed proposal for the upgrades and retrofits recommended in the energy audit report, including the cost of materials, labor, and other expenses.

If you are looking for a more comprehensive solution, you may also consider hiring a "Sustainable Building Consultant" or a "Green Building Consultant". These professionals specialize in designing and building energy-efficient and sustainable buildings and can provide you with a comprehensive plan for improving the energy efficiency of your building, including the integration of renewable energy sources and other green technologies.
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