21-24784-5 272 Old Wilson Rd Northampton Energy Efficiency Plan
ENERGY EFFICIENCY PLAN
Project Address: 272 Old Wilson Rd, Northampton, MA
Conditioned Floor Area 2,967 ft2 (includes conditioned basement)
Volume 27,918 ft3
Building Type Single family detached
Bedrooms 2
Assumptions for Preliminary Home Energy Rating
CET has completed a Preliminary Home Energy Rating based on the construction plans you have provided. Any
energy features not listed below are assumed to meet the prescriptive requirements of the IECC 2018.
Building Envelope Specifications Used in Analysis
Foundation Walls
Superior Wall Xi with R-19 fiberglass batts in 6” cavities and R-7
continuous interior foam board;
Batts to be grade 1: fully lofted and fitted around all obstructions with no
gaps, all cavities completely filled with insulation and fully enclosed by
rigid air barrier on all sides.
Lower Level Floor Slab R-5 foam board slab edge insulation; R-20 sub-slab foam board
insulation; Photo-document slab insulation prior to pouring concrete.
Rim & Band Joists R-21 closed cell spray foam including onto top of foundation wall.
Exterior Framed Walls and Walls to
Garage
2x6 stud wall with dense-packed cellulose (R-20+) and exterior R-12
insulated Zip-R sheathing;
Sheathing joints, edges and penetrations taped/sealed.
Walls to Attic 2x4 stud wall with 4.5” closed cell spray foam (studs covered 1” on attic
side).
Windows & Glass Doors U-value = .16, SHGC = 0.32
Solid Exterior Doors incl. to Garage R-5 / U-0.20, fully gasketed.
Flat & Vaulted Trussed Ceilings R-60+ cellulose; sealed wind baffles, full insulation contact with
sheetrock ceiling.
Blower Door Test/Envelope Airtightness 0.6 ACH50 or lower.
Energy Star, IAP, WaterSense, ZERH
Checklists
Meet all Checklist Requirements as verified by a HERS rater at pre-
drywall and final inspections.
Plumbing & Mechanical Systems Specifications Used in Analysis
Heating & Cooling Equipment
Ductless air-source heat pumps condition all 3 floor levels; 12.5
HSPF, 20 SEER;
Any electric resistance heaters to be controlled by push-button timer
switches, not thermostats.
Water Heating Equipment 3.50 Energy Factor 80-gallon heat pump water heater
Domestic Hot Water Pipes Insulated; 40’ maximum horizontal distance between water heater and
any fixture; No recirculation loop.
Showerheads, Toilets, & Bathroom Lavatory
Faucets WaterSense labeled
Whole House Ventilation
High Efficiency Energy Recovery Ventilator, 79% ASRE and 35 watts
at 66 CFM continuous ventilation; Adjustable speed control.
Basis: Broan B160E75R
ENERGY EFFICIENCY PLAN
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Lighting & Appliances Specifications Used in Analysis
Lighting 100% LED, CFL, or pin-based fluorescent
Refrigerator ENERGY STAR certified
Dishwasher ENERGY STAR certified
Range Electric Induction
Clothes Washer & Dryer ENERGY STAR certified
Bathroom & Ceiling Fans (if present) ENERGY STAR certified
Preliminary Home Energy Rating Results
Based on the assumptions described above, we have calculated the following Preliminary Home Energy Rating results.
Preliminary HERS Index: 30
Note that Confirmed Home Energy Rating results may vary from the Preliminary Home Energy Rating results due to
changes in building plans, energy features installed in the home, RESNET standards, software changes, and other
factors.
Preliminary Rater: John Saveson
Date: June 28, 2022
Job #: 21-24784-5