What does HDD stand for?

Heating Degree Days (weather derivatives / insurance index converting temperature into prices)

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.
Business, finance, etc.

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Samples in periodicals archive:

Under the agreement, the United States is divided into three regions: (1) the north, composed of states with population-weighted heating degree days (HDD) equal to or greater than 5,000; (2) the south, composed of states with population-weighted HDD less than 5,000; and the southwest, comprised of Arizona, California, Nevada, and New Mexico.

United States: AHRI, Energy-Efficiency Groups Agree To Equipment ...

Add the heating degree days and cooling degree days, as Sivak’s study does, and you get an idea of how much energy is used year-round in the region.

Study finds no power gluttony here

The Verifier features a complex ultrasonic measurement system consisting of: a loop-powered ultrasonic sensor; a meter configured to produce an electrical indication when a predetermined volume of fuel passes through it; a rewritable memory for storing a look-up table to track the volume of fuel in the tank; systems of calculating and tracking heating degree days and oil consumption and issuing alarms as needed; and a system of remote monitoring for the fuel tank of the building.

Long road to ending oil skimming

In fact, when calculating the heating degree days, the National Oceanic Atmospheric Administration is predicting that this winter will be 5.

Congress shouldn't short-change home heating aid

The 1999 code required slab-edge insulation at 3,000 heating degree days (Atlanta and north).

Out front with building codes: become familiar with the building code ...

Heating degree days (a measure for determining the impact of weather during the heating season) were 11% higher for the period compared to last year.

MGE Energy Reports Fourth-Quarter Earnings

In 2006 there was a mild winter that reduced heating degree days by 7.

Greenhouse emissions decline

Currently, New York is at 68% of normal heating degree days.

Takinging advantage of warm winter's impact on oil prices