As the government continues to push for ever more stringent energy saving measures in the housebuilding industry in its bid to meet carbon targets, the detrimental unwanted side effects of inefficient ventilation systems in airtight homes are still making their presence felt, says Aereco.<br> <br> New, sealed buildings provide better conditions for condensation to occur if the ventilation is not sufficient and efficient.<br> <br> The main cause of condensation is the generation of moist warm air caused by everyday domestic activities such as cooking, bathing, washing and drying clothes. A humidity operated demand controlled ventilation (DCV) system adjusts air flow based on the number of occupants and the ventilation demands that those occupants create, making it the most effective form of whole house ventilation on the market today, Aereco claims.<br> <br> But there is no recommendation for DCV in SAP Appendix Q as SAP lacks the methodology by which to test variable ventilation depending on occupancy, Aereco explains. The company says that there appear to be moves to rectify this situation.<br> <br> www.aereco.co.uk or enter E0246 on the reader enquiry card