Nationwide House Energy Rating Scheme (NatHERS)

The Nationwide House Energy Rating Scheme (NatHERS) measures a home’s energy efficiency to generate a star rating. It was first introduced in 1993.

The higher the star rating, the less energy needed to heat and cool the home to keep it comfortable. 

NatHERS Assessors currently use the house plans and building specifications of a home to input data into a NatHERS accredited software tool. NatHERS tools estimate the amount of heat that needs to be added or removed to keep that home comfortable. The NatHERS tools then generate a NatHERS star rating out of 10 and a Certificate. This star rating measures the home’s thermal performance, based on its structure, design and materials. 

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