Watch for condensation on windows as your early warning. How much could a tilted window cost me? It depends on wind, outside temperature, and your system. Leaving a tilt open for an evening can pull ...

You tilt the window for a breath of “fresh” without the bother of a gale. The heating hums, the room feels civilised, and you think you’ve found the sweet spot. In autumn 2025, that sweet spot is ...