HVAC sizing for Luxembourg buildings
HVAC sizing uses the EN 12831 standard adapted to Luxembourg's climate (design temperature -12 to -15 degrees C). Heating needs range from 25 kWh/m2/year (class A) to 300+ kWh/m2/year (class I).
EN 12831 standard and Luxembourg climate conditions
Transmission and ventilation losses calculation, design temperature -12 degrees C for Luxembourg City, -15 degrees C for highland areas.
Heat pump vs. pellets: comparison for Luxembourg
Heat pump (COP 3.0-4.0, EUR 15,000-22,000) for well-insulated buildings (A-D). Pellet boiler (85-95% efficiency, EUR 12,000-18,000) for houses with storage space. Hybrid recommended for E-I classes.
Heat recovery ventilation: essential for high-performance buildings
Dual-flow HRV recovers 80-95% of exhaust heat. Cost EUR 5,000-12,000, saves 25-40% of heating needs.
Frequently asked questions about HVAC sizing
How do I size my heating system?
Based on EN 12831: transmission and ventilation losses, considering surface area, insulation and Luxembourg design temperatures (-12 to -15 degrees C).
Heat pump or pellets for Luxembourg?
Heat pump for well-insulated homes (A-D), pellets for older houses with storage. Hybrid recommended for E-I.
Is HRV ventilation mandatory?
Not formally, but practically indispensable for classes A-B.
What budget for a complete HVAC system?
For 150m2: heat pump (~EUR 18,000) + HRV (~EUR 8,000) + distribution (~EUR 5,000) = ~EUR 30,000-35,000 before Klimabonus.
How to optimise system performance?
Insulate first, then right-size the system. Over-sizing reduces heat pump COP. Heating curve adjustment is essential.