Posted by:


Utility Cost Savings and Near Zero Carbon: Come see what an array of renewable energy and energy efficiency projects can do for an existing dwelling.

What You Need to Know


To complement the PV power system, a Water Furnace 7 Series Continuously Variable GSHP was installed. This system includes a closed loop, horizontally-trenched Ground Heat Exchange (GHEX) pipe, with 5 x 125' trenches, 5000' of pipe, unpressurized variable speed flow center, slaved to the GSHP system. De-superheater DHW, MERV11 Air Filter and Performance monitoring options.

Other Benefits:

Replaced noisy external compressor unit, freed space adjacent to house.

Maintenance Requirements:

Semi-annual filter replacement, had to add some water to flow center.

Efficiency or Sustainability Improvements:

External sun screen, lighting upgrade to LEDs, upgraded interior blinds, insulated garage door, bamboo flooring, upgraded windows, etc.

My Motivation:

(1) Sustainable future concern (2) Energy cost savings


Had to go beyond local contractors to get significant systems. Some extra effort and time required to work with Building and Safety, due to uniqueness of system.

Experience with Installer:

Excellent team. Worked with me on hiring local backhoe operator. Primary goal was to obtain most efficient system available.

Additional Notes:

Due to lack of local climate/soil data, I did extensive research prior to signing the contractor. Trenching was very challenging due to step slopes and tough digging (decomposed granite).

Open House Info:

9:00 AM to 5:00 PM on Saturday, 3 October 2015 and Sunday, 4 October 2015, The house is on a ridge several hundred yards off of Munz Ranch Rd on a private road. Limited parking right at the house, but we will ask neighbors to assist in providing overflow parking.

View Other Case Studies
annual savings
1720 Federal Colonial Rehab - Weymouth - MA
1720 Federal Colonial Rehab - Weymouth - MA

Residential|High Efficiency HVAC

Search for Other Case Studies
EnergySage Marketplace
Get the best deal on solar.
Get Started