In winter, we wrap ourselves in sweaters, turn on heaters, and pay exorbitant heating bills. But technology does not stand still. In 2026, new ways to keep the house warm without burning the budget emerged. We tell you about innovative insulators, smart windows, and heat recovery systems. Aerogel: the lightest insulator Aerogel is a solid material that is 99% air. It is almost weightless (1.9 kg per cubic meter), but retains heat four times better than mineral wool. A 1 cm layer of aerogel replaces 5 cm of foam. It is available in the form of mats, granules, and panels. It is non-flammable, does not absorb moisture, and does not shrink. The downside: it is expensive (from 3000 rubles per sheet). But in 2026, the price dropped thanks to Chinese manufacturers. Aerogel is already used in Scandinavia, Canada, and Russia (in expensive homes). Vacuum panels (VIP) A vacuum insulating panel is a sealed envelope from which the air has been evacuated. Its thermal conductivity is almost zero (like a thermos). At a thickness of 2 cm, it replaces 15 cm of ordinary insulation. Ideal for thin walls (historical buildings, balconies). But it cannot be cut, drilled, or damaged — it will lose its vacuum. The price is high (about 5000 rubles per square meter). In 2026, hybrid panels (vacuum + aerogel) appeared — more affordable. They are used in passive houses (Passivhaus). Phase change materials (PCM) These are microcapsules with a substance that melts at a certain temperature (e.g., at +22°C), absorbing heat. When the temperature drops, the substance crystallizes, releasing heat. Such materials are added to plaster, gypsum board, and paint. During the day, walls absorb excess heat, and at night, they release it. It works without electricity. It reduces heating costs by 20-30%. However, it is expensive (50% more than ordinary plaster). It is used in Europe and Japan, and experimentally in Russia. Smart windows with electrochromic dimming Ordinary windows lose up to 40% of heat. Electr ... Read more