Calculate your energy savings with different door options
This calculator helps you estimate the energy savings you can achieve by choosing a more energy-efficient door or window. The calculator is based on Maltese weather conditions and typical energy prices.
U-value: 1.4 W/m²K
Air leakage: 0.6 m³ @ 50Pa
U-value: 0.8 W/m²K
Air leakage: 0.25 m³ @ 50Pa
U-value: 0.6 W/m²K
Air leakage: 0.1 m³ @ 50Pa
U-value: 0.5 W/m²K
Air leakage: 0.08 m³ @ 50Pa
U-value: 1.0 W/m²K
Air leakage: 0.3 m³ @ 50Pa
U-value: 0.7 W/m²K
Air leakage: 0.2 m³ @ 50Pa
U-value describes the thermal insulation capability of a structure. The lower the U-value, the better the insulation. U-value indicates the density of heat flow that passes through a building component in a steady state when the temperature difference between the air spaces on different sides of the building component is of unit size. The unit is W/(m²K).
Air leakage describes the air tightness of the building envelope. The air leakage number n50 tells how many times the air volume of the building changes per hour through the leakage routes of the building envelope when a 50 Pa under or over pressure is created in the building. In a passive house, the air leakage number is ≤0.1 m³ @ 50Pa, in a low-energy house ≤0.25 m³ @ 50Pa.
Energy consumption varies significantly according to the seasons. In winter, the need for heating is greatest, which emphasizes the importance of energy-efficient doors and windows. In summer, on the other hand, solar heat radiation can cause a need for cooling, in which case solar protection glass can help reduce energy consumption.
Energy saving calculations take into account heat losses caused by both heat conduction and air leakage. The calculation is based on the degree day number, which describes the difference between indoor and outdoor temperatures as a function of time.