2015 Challenge Participant:

Select Construction - Mastronunzio Residence

Applicant: Andrew Mastronunzio

Project Address: 428 Church Street, Amston, CT 06231

Bdrms./Sq. Footage: 4 BD - 4,553 sq ft

Project Overview Project Specifications Project Team Project Photos
The Select Construction - Mastronunzio Residence project in Amston, CT.

General Project Overview:

Single family custom colonial on 5.01 acres in Hebron, CT, incorporating passive and active strategies for energy efficiency and net zero energy consumption.

Special Features:

  • Super-insulated, air tight shell, with passive and active solar array, and geothermal heat pump

Orientation and Envelope (Windows, Insulation, Framing): 

  • Shell: Oriented due east, with rear facing due west
  • Windows: Kohltech Estate Energlass, U-0.28
  • Walls: R-19 Fiberglass Batts, with Advantech Zip-R Sheathing
  • Attic: R-63 Blown-In Fiberglass, with Truss Roof
  • Framing: 2X6 Exterior, 2X4 Interior, with Truss Roof and I-Joist

Heating, Cooling, and Hot Water:

  • ClimateMaster variable speed 5 ton Geothermal HVAC

  • Phoenix HTP high-efficiency propane water heater

  • Auxiliary heat provided by heat loop from water heater into air handler (hydro-air).

  • All ductwork in conditioned space and Aerosealed to total net leakage of 4 square inches, most or all of which may be attributed to leakage around the foam stops used at the registers during testing. 


  • Lennox ERV3-200 Energy Recovery Ventilator

  • Panasonic Whisper Series bathroom fans 


  • 200A service from Eversource with net metering.

  • Most bulbs and all recessed lights are LED; Some fixtures have CFL.

  • ENERGY STAR® appliances including refrigerator, 2 dishwashers, laundry.   


  • 36 panel PV system on roof.  System was installed and operational early in construction. 1st 12 months of production yielded 12,000 kWh, or average of 1,000 kWh per month, 33 kWh per day.

Resources Sustainability Features:  

  • Low-flow faucets and shower heads, 1.6 GPF toilets, hot water recirculation system set up (piped and wired) 
  • On site well and septic means water comes from the ground and goes back into the ground; we are not importing treated water from some other town and then shipping off waste water to another town. 
  • The best sustainability feature is a household with a culture of not wasting water, not leaving the lights on, setting the thermostat a little warmer in summer and a little cooler in winter.  One can’t overstate the importance and benefit of just a little bit of consumer education and conscientiousness on the part of the homeowner.  
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