Solar heating, PV-generated electricity, composting toilets saved hundreds of thousands of dollars in operating costs over 30 years.

EnergySage Customer
Quick Facts
Energy Needs Met


or more of electricity

Energy Needs Met

75% to 99%

of space heating

What You Need to Know


Solar Heated Rock and Water Tube Heat Storage Sunny Boy and Fronius Inverters Smart Storm Rain Water Collectors Clivus multrum composting toilets Renovation of 100 year old buidling Broadmoor's 1911 horse barn was renovated in 1983 as a solar heated nature center. Sun space with water wall storage tubes and underfloor rock storage are backed up with a small wood stove. Natural day lighting and ventilation and composting toilets are features of the original renovation. In 2005 and 2007 arrays of 128 Evergreen solar panels were added to the roof.

Other Benefits:

a model for individuals and organizations reduced operating costs

Maintenance Requirements:


Efficiency or Sustainability Improvements:

Batt/Blanket Fiberglass R 28 - 40 blown cellulose and a mix Composting toilet, Daylighting, Rain Barrels, Sunspace, Super Insulated Walls/ Roof

My Motivation:

Mass Audubon commitment to energy efficiency

Open House Info:

Directions: FROM COPLEY PLACE USING MAPQUEST FOR 280 Eliot St., Natick, MA 01760-5513 1: Start out going NORTH on DARTMOUTH ST toward STUART ST / MA-9 E. 0.2 miles Map 2: Turn SLIGHT LEFT onto ramp. 0.1 miles Map 3: Merge onto I-90 W / MASS PIKE / MASSACHUSETTS TURNPIKE (Portions toll). 9.8 miles Map 4: Take the I-95 / RT-128 exit- EXIT 15- toward WALTHAM / DEDHAM. 0.3 miles Map 5: Merge onto I-95 S / MA-128 S toward SOUTH SHORE / CAPE COD. 0.7 miles Map 6: Take the RT-16 W exit- EXIT 22-21B- toward GROVE ST. / WELLESLEY. <0.1 miles Map 7: Take the ramp toward RT-16 W / WELLESLEY. 0.1 miles Map 8: Take the RT-16 W exit- EXIT 21B- toward NEWTON LOWER FALLS / WELLESLEY. 0.1 miles Map 9: Turn RIGHT onto WASHINGTON ST / MA-16. 3.0 miles Map 10: Turn LEFT onto WASHINGTON ST / MA-16. Continue to follow MA-16. 3.8 miles Map 11: End at 280 Eliot St Natick, MA 01760-5513, US Map Total Est. Time: 31 minutes Total Est. Distance: 18.69 miles Visitors are welcome to explore the building. The sanctuary consists of 624 acres with 9 miles of walking trails. For non-MassAudubon members there is a nominal fee ($5 and $4) to walk the trails. Come visit the building and enjoy the beauty of nature in fall!

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