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Location & Climate
Set the external design temperature for heat loss calculations
Use the 99.6% winter design temperature for the site. For MCS work, use the figure MCS 031 gives for the property's postcode. The presets below are close approximations.
External Design Temp-1.8 °C
-2010 °C
🌡️ Design conditions represent the coldest expected outdoor temperature. The ΔT (Delta T) between indoor target and outdoor design temp drives the entire heat loss calculation.