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Marblehead, MA

Single family Cape style home, built in 1953 completely renovated in 2012, the system has one 5-ton water-to-air heat pump with desuperheater and ERV system servicing 2 zones. The ground loops consist of one existing 260’ closed loop borehole, and one 450’ closed loop Twister System installed by Skillings & Sons, flow rate is variable using one ECM circulator (flowrate not measured). Cost savings are calculated using measured power consumption.

Westford, MA

A single family residence (3,900 sf) built in 2013. The system has one 3-ton water-to-air heat pump with a desuperheater and a heat recovery ventilation (HRV) system serving 3 zones. The ground loop consists of a single 510 ft deep borehole and is a closed loop system, installed by Skillings & Sons. Flow rate is assumed constant. Cost savings are calculated using measured power consumption.

Rye, NH

A 3,000 sq ft residence built around 1965 with a 6-ton, closed loop, water to air GSHP system. There are two zones serving the main house and an in-law apartment. The system was designed to have 2 x 480 ft boreholes, but ended up with with 3 boreholes (one 480 ft and two 240ft) due to fractures encountered during drilling.

Montvale, NJ

590 feet of TWISTER vertical loop heat exchanger was installed in this (3500sf) single family residence Built around 1970. The system is a 7 ton water to water heat pump serving multiple zones, which is fully monitored including actual system flow rate as well as loop temperature and power consumption.

Southington, CT

A single family residence (3,200 sf) built in 1995. The geothermal system was installed in 2011 and consists of three heat pumps. The ground energy source is a vertical closed loop. This site is monitored for total BTU production by measuring the total flow rate and the difference in entering and leaving loop fluid temperatures. Because runtimes of individual heat pumps are not being monitored, cost and carbon savings cannot be computed.

South Windsor, CT

A single family residence (1,875 sf) built in 1986. The geothermal was installed in 2009 and consists of a single water-to-water (3 ton) heat pump. The ground energy source is a vertical closed loop. Flow rates are set at the constant design rate and cost savings are modeled using measured runtime and heat pump manufacturer specifications.