Takahashi Deep Energy Retrofit

Multi-Family Residence - January 2012

My house has all kinds of interesting energy improvements: a tankless hot water system, ductless minisplit heat pumps powered by solar panels, fully insulated basement, R70 roof, and R7 windows!

Quick Facts

Energy Needs Met

100%

or more of space heating

Energy Needs Met

100%

or more of air conditioning

Property

Owner:: Kenji Takahashi
Type:: Multi-Family Residence
Address:: 29 Brimmer Street, Watertown, MA 02472
Size:: 2,700 sq ft
Energy need met:: 100% or more of space heating; 100% or more of air conditioning
Designations:: Deep energy retrofit
Event Participation:: NESEA Green Buildings Open House 2012 Host

Technology

Type:: High Efficiency HVAC
Installed:: January 2012
Size of System:: 5 tons
Purposes:: For space heating; For air-conditioning

Professionals & Suppliers

Energy Auditors:: Building Science Corporation

What You Need to Know

Description:

Roof: R-70 with 2" CCSF (R-13) and 5" OCSF (R-18) between rafters and 6" rigid foam (R-39) on the roof; Attic dormer walls: R-47 with 6" OCSF in cavity (R-21) and two layers of 2" polyiso in the exterior wall (R-26); Basement walls: R-20 with closed-cell spray foam; Basement floor: R-10 with xps rigid foam; Windows: R-7 Intus Windows in the attic and basement; Heating and Cooling: Mitsubishi Hyperheat ductless minisplit for the owner's unit, and a 96& gas furnace/AC system for the tenant's unit; Hot water: a Rinnai tankless unit for the owner's unit, and an AO Smith tank system for the tenant's unit; Ventilation: Balanced ventilation with a 95% efficient Heat Recovery Ventilator; Solar: 5 kW solar PV system connected to the owner's unit serving 100% of heating and cooling

Open House Info:

We are open from 1 to 3 pm on the 13th for the NESEA Open House. You can park your car on the street.

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