We design our systems to cope in the normal range of weather for your region and based on the information to hand at the time, but sometimes changes occur during the building process that affect the performance of the heating system. This can happen when alterations to the building elements are made either after we have designed the heating system or after the installation of the system. Should there be significant changes to the glazing or insulation specification to be installed in your project compared to that either advised or shown on the plans used for the heating design and quotation please advise our engineering team. The engineering team can then re-evaluate the design to ensure it is still appropriate to satisfy your heating requirements. Also, unforeseen behaviour, such as thermal bridging, can occur during the building process, which affects the performance of the heating system.