To properly size a cold plunge tub for your space, there are a few factors you need to consider.First and foremost, you need to assess the available space where you plan to install the tub. Measure the area carefully, taking into account any restrictions such as walls, doors, or other obstacles that may affect the size of the tub. Additionally, consider the height of the ceiling in the space, ensuring that it allows for proper installation of the tub and any necessary equipment.