TABLE OF CONTENTS
COSTIC Data Source
The integrated COSTIC data pertains exclusively to Unified Degree Days (DJU), or heating degree days based on 18°C, calculated using the "energy professional" method.
These data are sent every ten days at a daily time interval from September to June. There are no COSTIC data available for July and August.
Degree Day Calculation Method
Heating Degree Days (Deficit)
- S > Tmax (common in winter): DJ = S - Tm
- S < Tmin (exceptional at the start or end of the heating season): DJ = 0
- Tmin < S < Tmax (start or end of the heating season): DJ = (S - Tmin) × [0.08 + 0.42 × (S - Tmin) / (Tmax - Tmin)]
Cooling Degree Days (Surplus)
- S > Tmax: DJ = 0
- S < Tmin: DJ = Tm - S
- Tmin < S < Tmax: DJ = (Tmax - S) × [0.08 + 0.42 × (Tmax - S) / (Tmax - Tmin)]