Carefully managing ventilation is the best way to improve air circulation in a winter greenhouse without losing heat. One approach is to install small, adjustable fans that can circulate air without opening vents wide enough to let heat escape. These fans can keep air moving throughout the space, preventing cold spots and helping maintain an even temperature. You can also use low-level, passive ventilation systems such as louvered side vents or ceiling vents that allow air to flow out without causing significant heat loss.
When opening vents, do so only briefly or when the temperature rises above a certain threshold to prevent heat from escaping too quickly. Another strategy is to create a thermal curtain system, where you can partition off colder areas to contain warmth in the central growing space. By carefully balancing air circulation with heat retention, you can maintain a stable environment that encourages healthy plant growth without sacrificing warmth.
