Rental property adverts in Ireland should normally display the home’s BER rating, and the landlord or letting agent should be able to provide the BER certificate or reference number. You can also check the SEAI BER register using the property address, where available. A BER estimates the home’s energy performance, but actual heating costs depend on the property, systems and how it is used. If the rating is missing or appears out of date, ask the landlord or agent to clarify it and check the official SEAI guidance.