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.

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): 12748 kWh● Oil consumption (annual): 2021 gal/yr

o 2.8E8 MMBTU● Annual Fuel Costs: $7073.50

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 16425 gallons of

water● Less than a 2 year payback

Current Boiler (6)● 85% efficient oil boiler● 2000 gallons of oil per

year● Provides 2*108 BTUs to

the home per year

Possible upgrades (7)● Pellet boiler

o Carbon neutralo Low fuel cost and locally sourced fuel

● Natural gaso Cheaper fuel sourceo Lower carbon output

● Heat pumpso Purchase green electricityo Lower energy cost

Simple Analysis (7)

Heating system Kedel k68Three heat pumps and baseboard System 2000 oil System 2000 gas

Old system cost/yr $ 6,600.00 $ 6,600.00 $ 6,600.00 $ 6,600.00

New operating cost $ 4,249.26 $ 3,181.07 $ 6,800.00 $ 4,528.93

Cost system $ 13,500.00 $ 18,150.00 $ 11,800.00 $ 12,500.00

Savings per year $ 2,350.74 $ 3,418.93 -$ 200.00 $ 2,071.07

Payback (years) 6 5.3 none 6

20 year horizon (8 and 9)● Pellet Boiler

o NPV = $7,200o ROI = 250%

● Heat pumpso NPV = $6,900o ROI = 88%

Cash flow (6)

What if we cut fuel use in half?

Pellet 20yr NPV: $2,000Heat pump 20yr NPV: $1,700

What if oil prices stay constant?

Pellet 20yr NPV: $2,000Heat 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 savingso Payback in two years

● R-50 cellulose insulationo Returns $214 in annual savingso 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 yro Glass doors: 4 yro Replace damper: 7 yro 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?