Landlords are required by law to obtain a Energy Performance Certificate in order to rent out their property and indicate to the potential tenant what band the property is assessed at. This helps the potential tenant to understand what their commitment will be towards future bills. This Certificate is also required by law if a Landlord or a Vendor decides to sell their property and indicate to the potential buyer or tenant the rating the property is assessed at. The lower the rating, the more efficient the property is against loss of heat from the dwelling, thus lowering future bills for the tenant or buyer.