A mechanical device which uses compression and decompression of gas to heat and/or cool a house. A heating/refrigerating system in which heat is taken from a heat source, such as the air, and given up to the space to be heated. For cooling, it takes heat from the air in the space and gives it up outdoors.

Work performed by the Heating Contractor after the stairs and interior walls are built. This includes installing all duct work and flue pipes. Sometimes, the furnace and fireplaces are installed at this stage of construction.

Work done by the Heating Contractor to get the home ready for the municipal Final Heat Inspection. This includes venting the hot water heater, installing all vent grills, registers, air conditioning services, turning on the furnace, installing thermostats, venting ranges and hoods, and all other heat related work.

Common unit of measure of the quantity of heat is the British Thermal Unit (Btu). One Btu is the amount of heat required to raise one pound of water from 63° to 64°F (1 Btu = 1055.06 J). This is about the amount of heat given off by one wooden match. A pound of coal can produce 13,000 Btu.

Heating and cooling a solid metal to produce changes in physical and mechanical properties.

Glass that has been strengthened by heat treatment.

Heat always flows toward a substance of lower temperature until the temperatures of the two substances equalize. It travels by one or more of three methods: conduction, convection or radiation.

The amount of heating required to keep a building at a specified temperature during the winter, usually 65° F, regardless of outside temperature.

Aluminum alloys whose strength characteristics can be improved by heat treatment.

The amount of heat produced by the complete combustion of a unit quantity of fuel.

Highly fluorinated chemicals are used in cookware, clothing, outdoor apparel, carpeting, and food packaging to provide oil- and water resistant properties. They are persistent in the environment and have been detected in humans and biota all over the globe. In humans, some highly fluorinated chemicals have been associated with kidney and testicular cancer, thyroid disruption, elevated total cholesterol, and obesity. https://healthymaterialslab.org/tool-guides/hml-resources

A roof with four sloping sides. The external angle formed by the meeting of two sloping sides of a roof.

A notch cut in the end of a rafter to permit it to fit flat on a wall and on the top, doubled, exterior wall plate.

A type of wood-frame construction using heavy timbers for the columns, beams, joists, and rafters.

Seat cut in a rafter that rests on the wall plate.

The units of measure of sound frequency, named for Heinrich H. Hertz. One Hertz equals one cycle per second.

A joint that permits some action similar to a hinge and in which there is no appreciable separation of the joining members.

The ability of a paint to hide the previous color or substrate.

A light spot, area, or streak on a painted surface.

Surfaces that are frequently touched by building users and occupants such as door knobs, hand rails and tables. https://healthymaterialslab.org/tool-guides/hml-resources