The usual solar applications, photovoltaic cells that create electricity or solar hot water systems that heat water, often are expensive propositions.
But there is a new alternative: solar heaters.
Panels attached to exterior walls or roof take air from a building and use the sun's energy to heat it before pushing it back into the structure. It's simple and apparently effective.
"Free heat, what's better than that," said local builder Peter Scott Lord, whose family company is now a dealer and...
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