Whether or not you need a heater depends on what you want to grow. If your goal is to start your own seeds or to grow winter vegetables and ripen tender crops in summer, then you probably won’t need a heater. Many people germinate their seeds inside the house, in temperatures around 70 degrees F, and then move the seedlings outside to cool, bright conditions in an unheated greenhouse. If you intend to over-winter tender plants in the greenhouse, then a heater will be needed to maintain minimum temperatures.
Ventilation in any greenhouse is absolutely mandatory, and every Halls greenhouse includes roof vents as standard equipment, so a fan may not be needed, as long as there is adequate ventilation. Optional automatic openers are available.
Accessories make greenhouse gardening even more enjoyable, and Halls offers, as optional equipment, a variety of shelving units, shade cloth, watering systems, etc.