264 Old Wilson Rd - Energy Efficiency Plan - no PV
ENERGY EFFICIENCY PLAN
254 Old Wilson Rd, Lot 2, Northampton MA
Conditioned Floor Area and Volume 3425 ft2, 35,105 ft3 (including basement)
Building Type Single family detached
Bedrooms 3
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 2015.
Building Envelope Specifications Used in Analysis
Foundation Walls R-34 Superior Wall Xi+
with R-15 fiberglass batts in cavities (Grade I)+R7
Under Slab 4” Formular-R (R-20) underneath
Thermal Break at Slab Edge 4” XPS (R-20) camfered down to 2” at top
Band Joists 3” closed cell spray foam (R-18)
Exterior Walls
R19 Bl Cellulose w/ R14 continuous insulation
Walls capped at top plate and insulation enclosed by interior air barrier
(drywall and/or vapor retarder)
Walls to Garage Same as exterior walls
Windows Triple glazed, Argon gas filled, U-value = 0.18, SHGC = 0.20
Glass Doors Low E, Argon filled U-value = 0.29, SHGC = 0.28
Exterior Doors R-5 / U-0.20
Roof R54 Structural Insulated Panel
Air Sealing & Blower Door Test Aerobarrier run until 0.45 ACH50 or better achieved
Thermal Enclosure Checklist Meet all Checklist Requirements as verified by a HERS rater at pre-
drywall and final inspection
Plumbing & Mechanical Systems Specifications Used in Analysis
Heating & Cooling Equipment Multi head ductless mini-split system
11.5 HSPF, 20 SEER
Thermostats Programmable
Water Heating Equipment 3.48 EF heat pump water heater, 80 gallons
Domestic Hot Water Pipes Maximum of 37 feet total distance
from water heater to farthest fixture
Whole House Ventilation
Energy Recovery Ventilator, 48 watts
67% Adjusted Sensible Recovery Efficiency,
58% Adjusted Total Recovery Efficiency
90 CFM continuous airflow
Lighting & Appliances Specifications Used in Analysis
Lighting 100% LED, including interior, exterior, and garage
Refrigerator 550 kWh/year or less
Dishwasher ENERGY STAR certified
Clothes Washer/Dryer Any
ENERGY EFFICIENCY PLAN
Page 2 of 2 ~ The Center for EcoTechnology ~ Tel (413) 586-7350 ext.242 ~ Fax (413) 586-7351 ~ greenhome@cetonline.org
Preliminary Home Energy Rating Results
Based on the assumptions described above, we have calculated the following Preliminary Home Energy Rating results.
Preliminary HERS Index: 41
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: Bill Lafley
Date: 10/23/2020
Job #: 20-06111