Refrigerant - A substance that remains a gas at low temperatures and pressure and can be used to transfer heat. Freon is an example and is used in air conditioning systems.

Neutral wire - Usually color-coded white, this carries electricity from an outlet back to ground. Also see hot wire and ground.

Default - Breach of a mortgage contract (not making the required payments).

Heat loss - Heat escaping from a home usually to outside air. Heat gains and losses are expressed in BTUs per hour.

Square -tab shingles - Shingles on which tabs are all the same size and exposure.

Tip up - The downspout extension that directs water (from the home's gutter system) away from the home. They typically swing up when mowing the lawn, etc.

Blocking - Small wood pieces to brace framing members or to provide a nailing base for gypsum board or paneling.

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