Claims against mechanical and electrical (M&E) consultants are likely to increase as greater demand for services and design creativity is required to address the effects of climate change. The UK experienced its hottest summer ever in 2025. Indeed, all five of the UK's warmest summers have occurred this century. Climate change is not on the way, it is already here, bringing with it an increased need for powerful cooling systems in both commercial and residential premises, whether new build or by way of refurbishment. Design parameters and capacity for such systems will need to adapt to the changing climate. We have already seen several large claims against M&E consultants for inadequate cooling (and heating) designs. We also predict that new building projects in the UK are likely to become subject to compulsory 'net zero' standards within the next few years. Currently, compliance with the UK Net Zero Carbon Building Standards is not obligatory, but it is unlikely to stay that way. This could well become an evolving source of claims against M&E engineers (and other construction professionals) operating in this space, given that litigation for failure to achieve net zero targets has already begun in other arenas.