We’ve been incorporating current energy saving details into our homes since we built the model home for Northeast Utilities’ Energy Crafted Home Program in 1993. That was a test house for what eventually became Energy Star Homes. This family home in Northfield includes many of the details we learned then and in the years since. Proper site placement, a high efficiency heating system, a well defined building envelope, efficient windows and doors, tight air sealing with an HRV system for fresh air, and plenty of insulation are some of the features that helped earn this house a HERS Index of 51 without increasing the construction cost.