If you are interested in buying or selling a zero energy or zero energy ready home, consider engaging a real estate agent who has certification or training in energy efficient homes. Several organizations provide a “green real estate agent” designation to those who have completed their advanced training in energy efficient homes and sustainable building practices.

Real estate agents trained in sustainable building can help determine the true value of a zero or near-zero energy home. He or she can ask the owner or builder the right questions and explain the value of zero energy homes to loan officers and building appraisers. Here are 21 questions about zero energy homes to ask your real estate agent.