Mayflower Hill House Energy Audit May 8, 2015 Compiled by: George Voigt ’17, Danqing Zhao ’17, Kel Mitchel ’16, Emma Reif ’16, Savannah Judge ’15, Evan LaMarre ’15 and Divya Bisht ’15 CH/EC 278

Overview of the House (3) ●3343 square foot brick home built in 1959 ●Well shaded for cooling ●Roof also has sufficient sunlight

Energy Usage (4) ●Electricity consumption (annual): kWh ●Oil consumption (annual): 2021 gal/yr o 2.8E8 MMBTU ●Annual Fuel Costs: $

Economic Assumptions (4) ●Oil Prices: $3.30 ●Electricity Costs: $.13/kWh ●Pellet Costs: $250/ton ●Discount Rate: 8%

Wifi Thermostats (5) ●Replace all thermostats ●$200 per unit ●1.21yr payback

Efficient Shower Heads (5) ●Simple intervention for water, energy and money saving ●Replace shower heads with those that use 1.5 gallons/minute ●Annual savings: $118 and gallons of water ●Less than a 2 year payback

Current Boiler (6) ●85% efficient oil boiler ●2000 gallons of oil per year ●Provides 2*10 8 BTUs to the home per year

Possible upgrades (7) ●Pellet boiler o Carbon neutral o Low fuel cost and locally sourced fuel ●Natural gas o Cheaper fuel source o Lower carbon output ●Heat pumps o Purchase green electricity o Lower energy cost

Simple Analysis (7) Heating systemKedel k68 Three heat pumps and baseboardSystem 2000 oilSystem 2000 gas Old system cost/yr$ 6, New operating cost$ 4,249.26$ 3,181.07$ 6,800.00$ 4, Cost system$ 13,500.00$ 18,150.00$ 11,800.00$ 12, Savings per year$ 2,350.74$ 3, $ $ 2, Payback (years)65.3none6

20 year horizon (8 and 9) ●Pellet Boiler o NPV = $7,200 o ROI = 250% ●Heat pumps o NPV = $6,900 o ROI = 88%

Cash flow (6)

What if we cut fuel use in half? Pellet 20yr NPV: $2,000 Heat pump 20yr NPV: $1,700

What if oil prices stay constant? Pellet 20yr NPV: $2,000 Heat pump 20yr NPV: $1,700

Roman Shades (10) ●15 windows ●$1500 total cost ●6 yr payback

Roof and Attic Insulation (10) ●R-5 exterior foam insulation o Returns $980 in annual savings o Payback in two years ●R-50 cellulose insulation o Returns $214 in annual savings o Payback in two years

Sealing Air Leaks (10) ●Benefits: improved comfort, reduced risk of moisture damage, improved air quality, prevents pipes from freezing ●Yearly savings of $478 ●Simple payback of 2 years

Ventilation (11) ●Passive ventilation ●Flue savings: 20 gallons of oil ($67) per year ●Options o Chimney pillow: 1 yr o Glass doors: 4 yr o Replace damper: 7 yr o Fireplace insert: 30 yr Top Seal Damper (Lock-top or Hinged) Chimney Pillow Recommendations:

Electrical Systems (12 and 13) ●Install a 13,000 kWh Solar PV system on the southern facing roof ●Initial cost is $24,746 (with a $10,000 government refund) ●This will cover 100% of the electricity consumption ●Estimated savings of $2,170/year ●Simple payback period of 11.4 years

Lighting (14) ●Replace all 78 incandescent bulbs with LED ●Reduction of 2286 kWh energy usage annually ●Annual savings: $148, lifetime savings: $1776 ●3 year payback

Summary (15) 2-Year Plan ●Thermostats ●Shower heads ●Chimney Pillow ●Seal leaks 5-Year Plan ●LED lights ●Insulation (cellulose, foam) 10-Year Plan ●Replace damper ●Roman shades ●Solar PV ●Pellet boiler

Thank you! Questions?