Research Article
Italian Residential Buildings: Economic Assessments for Biomass Boilers Plants
Table 5
HDD, heating hours per day, and heating period (Decree 412/93).
| Climatic area | HDD | Maximum heating hours per day | Heating period |
| A | <600 | 6 | December 1–March 15 | B | 601–900 | 8 | December 1–March 31 | C | 901–1400 | 10 | November 15–March 31 | D | 1401–2100 | 12 | November 1–April 15 | E | 2101–3000 | 14 | October 15–April 15 | F | >3000 | No limitations | No limitations |
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