Heat Lightning: Lightning that appears as a glowing flash on the horizon. It is actually lightning occurring in distant thunderstorms, just over the horizon and too far away for thunder to be heard.

 

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Heat Lightning: Lightning that appears as a glowing flash on the horizon. It is actually lightning occurring in distant thunderstorms, just over the horizon and too far away for thunder to be heard.

Heating Degree Day: One heating degree day is given for each degree that the daily mean temperature is below 65°F. It is used as an indication of fuel consumption.

Heathland: Open uncultivated land (particularly in the british isles) having sandy soil and dominated by small shrubs with small hard leaves (e.g., heather)

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

Latent Heat: The energy released or absorbed during a change of state.

Lightning: A sudden and visible discharge of electricity produced in response to the build up of electrical potential between cloud and ground, between clouds, within a single cloud, or between a cloud . . . View Full Definition

Heat Wave: A period of abnormally and uncomfortably hot weather. It could last from several days to several weeks. The Weather Channel uses the following criteria for a heat wave: a minimum of ten stat . . . View Full Definition

International Wheat Agreement (IWA): Replaced in 1995 by the International Grains Agreement.

Heat Trim: 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 cond . . . View Full Definition

Heat Rough: 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 insta . . . View Full Definition