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.

Mortgage deed - Legal document establishing a loan on property.

Manufacturer's specifications - The written installation and/or maintenance instructions which are developed by the manufacturer of a product and which may have to be followed in order to maintain the product warrantee.

Rafters - Parallel framing members that support a roof.

Watt (W) - A measure of the power an electrical device consumes. Watt hours (WH) express the quantity of energy consumed. Also see volt, amp, and kilowatt.

Equity - The "valuation" that you own in your home, i.e. the property value less the mortgage loan outstanding.

Heat pump - A mechanical device which uses compression and decompression of gas to heat and/or cool a house.

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