Ton - A measure of cooling power. One ton equals 12,000 BTU's.

Building insurance - Insurance covering the structure of the building.

Back-up system - Auxiliary heating equipment that kicks in when the main unit--usually a heat pump or solar setup--can't handle the full load.

Capital and interest - A repayment loan and the most conventional form of home loan. The borrower pays an amount each month to cover the amount borrowed (or capital or principal) plus the interest charged on capital.

Furring strips - Strips of wood, often 1 X 2 and used to shim out and provide a level fastening surface for a wall or ceiling.

COP (coefficient of performance) - A measure of the efficiency of any heating unit-- arrived at by dividing its output in BTUs by its input in BTUs.

Wire nut - A plastic device used to connect bare wires together.

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