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Net Positive Energy Home

Mount Vernon, New Hampshire

3 bedroom, 2 bath, 2 floors, 2,130 sq. ft.
Climate: IECC 5A, cold
HERS Score with PV: -9
HERS Score without PV: 38
Category: Custom for Buyer
 

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Hollis Zero Energy Home

Hollis, New Hampshire

Layout: 4 bedroom, 3.5 bath, 2 floors, 4,850 sqft.
Climate: IECC 5A, cold
Category: Custom for Buyer

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Hollis Zero Energy Ranch

Hollis, New Hampshire

Layout: 3 bedroom, 2.5 bath, 1 floor, 3,185 sq. ft.
Climate: IECC 5A, cold
Category: Custom for Buyer

Modeled Performance Data

• HERS Score with PV: 3
  
• HERS Score without PV: 41
• Annual Energy Savings: $7,359

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Hollis Net Positive Home

Hollis, New Hampshire

Layout: 4 bdrm, 2.5 bath, 2 floor, 3,197 sqft.
Climate: IECC 5A, cold
Category: Custom for Buyer

Modeled Performance Data

• HERS Index: without PV 26; with PV -7
• Annual Energy Costs: without PV $1,650; with PV $200
• Annual Energy Cost Savings: (versus typical new homes) without PV $4,850; with PV $6,500
• Annual Energy Savings: without PV 8,800 kWh; with PV 27,750 kWh
• Savings in the First 30 Years: without PV $19,750; with PV $264,250

Key Features

• Walls: 2x6, 24 in. o.c., total R-41: 5⁄8" drywall; 1-1⁄2" service cavity, vapor-open membrane, 5-1⁄2" dense-pack fiberglass in wall cavity, 1⁄2" CDX plywood, vapor-open WRB, 5" mineral wool board, 3⁄4" furring strips/drainage plane, cedar siding.
• ​Roof: Truss gable roof, 5⁄8" CDX sheathing, self-adhered bituminous membrane over whole roof, fiberglass shingles; 22" raised heel trusses.
• Attic: Vented attic with 18" R-38 blown fiberglass.
• Foundation: Basement, 5⁄8" drywall, 2x4 24" o.c., vapor-open membrane, 1" Type IX closed-cell EPS, 10" concrete, self-adhered membrane, 5" mineral wool, dimple mat.
• Windows: Triple-pane, low-e2, argon-filled, vinyl-framed, tilt-turn; U=0.15, SHGC=0.51.
• Air Sealing: 0.60 ACH 50. Sub-slab poly and vapor-open wall and ceiling air barriers were taped together at seams. All penetrations sealed with tape and fluid-applied flashing.
• Ventilation: ERV, 116 CFM, 44 Watt, SRE 83; separately ducted, MERV 13 filter, CO2 sensor. 
• HVAC: Ducted mini-split heat pump; 11 HSPF, 18 SEER, 3 indoor air handlers, 3 outdoor compressors. Rigid metal ducts, sealed and insulated, compact design, in conditioned space.
• ​Hot Water: Heat pump water heater, 65 gallon, EF 3.85; in basement.
• Lighting: 100% LED, large windows used throughout the home.
• Appliances: ENERGY STAR refrigerator, dishwasher, clothes washer, primary water heater. 
• Solar: 9,75-kW of solar panels; installed on barn roof.
• Water Conservation: EPA WaterSense certified whole house.
• Energy Management System: PV software tracks production. Wi-Fi HVAC controls.
• All materials Green Guard Gold Certified. No Redlist products were used.

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Wilton Net Positive Home

Wilton, New Hampshire

Layout: 3 bdrm, 2 bath, 1 floor, 2,001 sqft.
Climate: IECC 5A, cold
Category: Custom for Buyer <3,000 sqft.

Modeled Performance Data

• HERS Index: without PV 30; with PV -25
• Annual Energy Costs: without PV $1,450; with PV $200
• Annual Energy Cost Savings: (versus typical new homes) without PV $3,900; with PV $5,100
• Annual Energy Savings: without PV 14,100 kWh; with PV 28,400 kWh
• Savings in the First 30 Years: without PV $157,900; with PV $207,300

Key Features

• High-performance insulation system for enhanced quiet and comfort
• Comprehensive draft protection
• Fresh air system for cleaner indoor air
• High-efficiency comfort system
• Energy-efficient appliances and advanced lighting technology for energy and water savings
• Low-flow water fixtures
• 11.5 kW, rooftop panels
• Cool-Roof certified
• EV charging station

MORE DETAILS

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Zero Energy Ready Home

Mont Vernon, New Hampshire

Layout: 3 bdrm, 2 bath, 1 floor with loft and walk out basement, 2,614 sqft.
Climate: IECC 5A, cold
Category: Custom for Buyer <3,000 sqft.

Modeled Performance Data

• HERS Index: 35
• Annual Energy Cost Savings: $5,450 (relative to an average U.S. home)
• Air Change per Hour: 0.68  (at 50 Pa)
• Above grade walls: R-50
• Below grade walls: R-30
• Roof: R-60
• Windows: U-value: 0.14, SHGC: 0.45
  

Key Features

• Exposed beams
• High ceilings

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