What is a 'green' home and what might you see on the upcoming tour? Typically a 'green' home is one considered sustainable because it conserves energy and water. But what is the core concept behind the idea of sustainability? It can be argued that a truly sustainable home is one that uses ecological principles as a model - no waste, no pollution and resources used to build or power the home are mostly local, renewable or recycled. Energy efficient homes are more economically sustainable, saving the home owner money and conserving the shrinking pool of valuable natural resources. They directly or indirectly reduce the emission of greenhouse gases that contribute to the undeniable occurrence of climate change. Although few houses include all sustainable features that are available, many have several key elements, especially in relation to energy efficiency. Prominent examples include geothermal heating and cooling, photovoltaic solar systems, solar hot water, advanced heat-recovery technologies, and energy-efficient building materials, which taken together can contribute to the reduction of energy consumption by as much as 70%. Let's look in more detail at a couple of energy efficient design features you will encounter on the tour.

Geothermal heating and cooling is becoming increasingly popular and is based on energy exchange between air in a building and the ground where the temperature is reasonably constant at about 10C. The system consists of pipes containing an antifreeze fluid that form a closed loop from the heat pump in the building to the ground and back. In winter the fluid flows in one direction and heat from the ground is extracted by the pump and effectively amplified by a compressor/condenser system. In summer, the direction of the fluid is reversed and the heat from the building is dissipated into the earth. The warm or cool air is distributed in the building via forced air or through water coils in the floor.

Straw bale buildings typically consist of bales stacked on a raised footing. The walls may support the roof or a separate post and beam construction supports the roof. The inside and outside surface of the straw walls are stuccoed or plastered, protecting the straw from moisture infiltration. A membrane vapour barrier is not typically recommended as it may lead to trapping of moisture.

For just $20.00 (or two for $35.00) you can explore homes featured recently in local newspapers and see their green features. In addition, several local businesses that supply 'sustainability' products will be featured at each home. The homeowners and the vendors will be on hand at each location to answer questions. Tickets, which have a map to the sites, can be purchased at Salmon Arm Stationary, Wearabouts or Shuswap Health Foods. Tour includes coffee and cookies. For more information: 250-833-0325.