It was a pleasure working with Building Efficiency. From the informative energy audit that they performed at the beginning of the project (required and rebated as part of the PG&E rebate process) through the abatement of the old asbestos covered ducts to the installation of the new furnace / ducting system Building Efficiency was thoroughly professional and effective. We’re thrilled with the improvements to our house, and look forward to the next phase (insulation) soon.