New research reveals significant disparities in energy performance between older and newer homes in New South Wales, with over 850,000 properties rated below 2 stars on the NatHERS scale.Homes built before 2004 lack basic insulation and efficient appliances, leading to higher heating and cooling costs.The study, analyzing 1,091 older homes, found that 72% of fixed heating systems and 60% of cooling appliances had medium or below efficiency ratings.Renters face worse conditions, with rental properties averaging 1.6 stars compared to owner-occupied homes at 2.1 stars.The government's Home Energy Saver scheme offers loans and discounts to improve energy efficiency, but cost remains a barrier.Upgrades like insulation, sealing gaps, and switching to efficient appliances could reduce energy use by up to 39%.The findings underscore the urgent need for retrofitting older homes to enhance comfort and lower energy bills.