The Mallett Deep Energy Retrofit A Renovation for the Next 125 Years

352 DATE

Peter Troast

• Founder & CEO of Energy Circle

• Information Website and eCommerce store of user-tested Energy Efficiency Gear

• Energy Monitors, Lighting, Smart Strips, Timers & Switches• My house: Kill-a-Watt, Blueline, TED 1000, TED 5000, eMonitor

• Energy Efficiency Auditor/Contractor Web & Marketing Software Platform• 200+ Customers in 46 States, ME to CA to FL to AK

• Passionate About• Deep Energy Retrofits• Real time energy monitoring• Success of home performance contractor sector

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Deep Energy Retrofits& Historic Preservation

Incompatible?

39% 27%

5

Energy Use in the US

34%

18%

21%

27%transportation

residentialindustrial

commercial

Source: US Energy Information Adm.

30%

18%20%

32%transportation

residential

industrial

commercial

Buildings are the single largest user of energy

Buildings are the largest contributor of greenhouse gas emissions

Use of Energy Greenhouse Gas Emissions

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If every home built from now until 2030 was

Net Zero we’d reduce residential building energy by

~8%

124 Million

US Housing Stock

9

0

6,250

12,500

18,750

25,000

Pre1920 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s

Existing US Housing Stock, 1000’s

significant need for energy retrofit

moderate need for energy retrofit

some need for energy retrofit

Sources: US Census Bureau, Annual Housing Survey.

The Challenge of Older Homes

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Use More EnergyPre-1940 homes use 32% more energy than 1980‘sAverage 120MM btu’s/house vs 81MM

Disproportionately Located in Cold Climates

Have Construction Details that are Energy ChallengesBasements and Crawl SpacesHeavier use of fuel oil

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But it’s only 14% of homespre-1940

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14%equals

180 Coal Plants

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“super-insulated houses...an even greater threat to historic housing

stock...than teardowns”

Sally ZimmermanHistoric New England

4.29.09

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Defining Deep

352 DATE

Defining “Deep Energy Reduction”

• DOE Building America Program: 50%+ Reduction Over Code

• ACI 1000 Home Challenge: 75-90% Reduction in Actual Use--Not Modeled

• Measured on Actual or

• Measured Against Modeled based on

• Climate Zone, House Size, Occupants, Heat Sources

• Home Only--no transportation, embodied, durable goods, vacations, consumables

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352 DATE

Beyond Energy & Carbon

• Resiliency

• Affordability

• Durability

• Comfort

• Health

• Value

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57 Depot StreetFreeport, Maine

Naomi C. O. Beal Photo

Oak Street, 1894

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The Life of 57 Depot Street

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1st Half 2nd Half

Day Month Year© 2010Building Science

Corporation

Freeport RetrofitW

arre

n C

onst

ruct

ion

Gro

upFreeport, ME

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Source Energy Savings – 61% Deep Energy Retrofit

Source Energy Parametric Annual Loads Study

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Parametric Energy Modeling

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All About Air Sealing. 26% of Reduction

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Next is Insulation: 8%

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High Efficiency Furnace: 7%

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Lower Impact

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CFL Lighting8%

96% Eff. Furnace14%

Windows5%

Insulation21%

Air Sealing53%

Breaking Out the Reductions

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Insulating In vs Out

Advantages of Going In• Minimizes exterior impact visually

• Siding and roofing not impacted

• Windows remain in place

• Align with interior renovation?

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Advantages of Going Out• Can remain occupied

• Minimize code impact (stair widths)

• No impact to partitions, bearing walls

• Align with New Siding or Roofing or Windows

• Plastic materials to the exterior

• Proven wall & roof assembly

352 DATE

The Cost of Federal Funding

1. Section 106 Review: National Historic Preservation Act

2. HUD Rules: Low Bid Wins

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352 DATE 49

“finding of adverse impact”

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Compromises for Historic Preservation

• 2” Polyiso on Walls

• Insulate IN on Front Facade

• Marvin Triple Glazed vs Serious Windows (Muntins)

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352 DATE

Our Attempt to Scare Off Builders

A Very Aggressive Air Tightness Standard

276 CFM50

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352 DATE

Our Attempt to Scare Off Builders

An Absurd Very Aggressive Air Tightness Standard

276 CFM50

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“A few buildings have achieved air infiltration of less than the target. Very few of these have been retrofit buildings. Buildings built with board sheathing, and with rubble foundations, are inherently more difficult to air seal. A target such as 276 CFM50, referenced in the Specifications, is likely unachievable with the construction as designed.”

Building Science Corporation

352 DATE

Progressive Testing!

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352 DATE

Cost Evaluation

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352 DATE

Biggest Mistake/Lesson: HVAC

Hybrid Gas Furnace and Air Source Heat Pump,fully ducted, with integral HRV

• 2 Ton/15 SEER Trane Heat Pump (X2)

• 97% AFUE Trane Direct Vent Gas Furnace;60,000 BTU/h

• RenewAire EV200 200 CFM HRV(157 W @ 181 cfm)

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Oversized (Manual J Cooling = 1.4 tons)

Hybrid = Expensive

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352 DATE

Thank You!

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Peter Troastptroast@energycircle.com

www.energycircle.com

@EnergyCircle

207-847-3644