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    Glossary

    This glossary provides definitions of common terms used in home construction, repair, and maintenance. It is intended as a quick reference to foster clearer communication between homeowners, builders and contractors.
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    Air duct

    Air change

    Air conditioner

    Air exchanger

    Air intakes

    Air register

    Air-Source Heat Pump

    Appliance energy efficiency ratings

    Appliance standards

    Attic

    Attic bypass

    Attic vent

    Backdrafting

    Backfill

    Ballast

    Baseboard

    Baseboard radiator

    Batt/blanket

    Beam

    Bearing wall

    Boiler

    Bypass

    Casement

    Caulking

    Central heating system

    Chimney

    Chimney effect

    Circuit breaker

    Coefficient of performance (COP)

    Combustion air

    Combustion by-products

    Compact fluorescent light

    Condensation

    Condenser

    Condenser coil

    Coniferous tree

    Conservation Improvement Program (CIP)

    Crawl space

    Deciduous tree

    Degree day

    Dehumidifier

    Dehumidistat

    Dew point

    Direct gain

    Door threshold

    Double hung windows

    Double-pane window

    Downspout

    Drywall