The residence of Brian K. Nelson and familly, and office of NMD, Inc., houses a very unique mechanical room. For years, the basement of the Nelson Residence has been used as the heating, cooling, and domestic hot water plant for their home. But it has also been used as a testing grounds for new heating and cooling technologies and control systems.

Currently, an eight ton horizontal geothermal DX ground to water system provides all of the heating, cooling, and domestic hot water pre-heat for the Nelson familly. Two four ton heat pumps take turns raising the temperature of the heating tank or lowering the temperature of the cooling tank to provide warm air heat and air conditioing. This hot or chilled water is sent to two air handlers and run through oversized hydronic coils. This sytems preheats the domestic hot water in conjunction with an AET solar hot water panel system. As a backup, a Noritz tankless hot water system boosts the domestic hot water when needed.

A Direct Digital Control System, or DDC, controls every aspect of the homes heating, cooling, and solar hot water systems. A flat screen display shows tons of carbon dioxide and money saved, as well as current function of the system. Both the DDC and traditional guages and meters display ground, water, and air temperatures throughout the system as well as water and air pressures. This allows us to measure the performance of the system and compare real world data with our software projections.