The secondary loop is typically made of High-density polyethylene pipe and contains a mixture of water and anti-freeze (propylene glycol, denatured alcohol or methanol).
The proposed renovations also include a geothermal heating and cooling system, allowing the project to be certified as LEED gold certified.
Built in 2002-3, its office is heated by a Ground Source Heat Pump, with hot water being partly provided by an evacuated tube solar water heating system.
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