, ▁hot ▁water ▁and ▁for ▁whole ▁house . ▁These ▁outputs ▁are ▁obtained ▁in ▁absolute ▁measures ▁and ▁unlike ▁to ▁score ▁rating ▁these ▁outputs ▁can ▁be ▁used ▁to ▁compare ▁houses ▁like ▁that ▁of ▁miles - per - g all on ▁ratings ▁are ▁used ▁to ▁compare ▁the ▁cars . ▁ ▁Re comm end ations : HER S ▁can ▁produce ▁a ▁list ▁of ▁recommended ▁improvements ▁based ▁on ▁some ▁life ▁cycle ' s ▁effective ▁cost ▁analysis . ▁These ▁recommend ations ▁may ▁be ▁per tain ing ▁to ▁any ▁of ▁the ▁in efficient ▁components ▁of ▁a ▁building ▁i . e . ▁ins ulation ▁layer ▁in ▁the ▁composite ▁wall ▁of ▁building , ▁air ▁condition ing ▁equipment , ▁water ▁he ating ▁unit , ▁Double - g laz ed ▁windows , ▁etc . ▁ ▁H ERS ▁types ▁As ▁per ▁the ▁national ▁energy ▁policies , ▁the ▁H ERS ▁are ▁known ▁by ▁different ▁names ▁in ▁different ▁countries . ▁The ▁implementation ▁and ▁promotion ▁of ▁H ERS ▁in ▁a ▁country ▁depends ▁upon ▁the ▁national ▁energy ▁policy . ▁Bes ide ▁all ▁this , ▁the ▁aim ▁of ▁all ▁H ERS ▁is ▁almost ▁same ▁and ▁it ▁can ▁be ▁class ified ▁into ▁three ▁types . ▁ ▁Pers pective ▁H ERS ▁: ▁This ▁H ERS ▁provides ▁minimum ▁standards ▁for ▁the ▁materials , ▁equip ments ▁and ▁methods ▁of ▁efficient ▁design ▁and ▁construction ▁that ▁must ▁be ▁met ▁to ▁qual ify ▁for ▁an ▁energy ▁efficiency ▁rating . ▁▁ ▁Calcul ation ▁based ▁H ERS : ▁This ▁H ERS ▁uses ▁computer ▁based ▁model ing ▁for ▁the ▁prediction ▁of ▁energy ▁performance ▁relative ▁to ▁the ▁requirements / stand ards