The Henger St project marks E3’s first collaboration with our new partner, Hilltop Alliance. This vacant, overgrown home requires significant attention! Due to its small and compact size, it is well-suited for heat pump space heating with a furnace backup.
Our typical set of improvements all apply to this projects:
- Upgrading to high-performance triple-pane windows instead of standard windows.
- Insulating walls with dense-packed cellulose.
- Insulating and air sealing attic slopes and flats, extending insulation along the roofline down to the eaves. Since the knee walls are now within the thermal boundary, they are not insulated. Dense-packed cellulose is covered with 1″ of rigid foam board with taped seams to reduce thermal bridging through roof joists, improve air sealing, and provide additional insulation in this finished attic.
- Insulating the floor over the garage with dense-packed cellulose.
- Air sealing and insulating rim joists in the basement.
- Adding moisture protection around the house with a 10 mil poly skirt, buried below ground.
- Replacing the gas storage water heater with a hot water heat pump.
- Installing a heat pump for air conditioning and partial heating, integrated with a smaller new furnace.
As the result of these enhancements to energy efficiency, this home is expected to use 36% less energy, reduce CO2 emissions by 3 tons, and save future homeowners $530 in annual utility bills.