To be honest greenhouse technology has not changed much in decades apart from toughened glass and polycarbonate glazing.
Greenhouses can become very hot inside. Even in March time the temperature can soar inside greenhouses. The best way to overcome this is to have auto vents or greenhouse shading. However this will cost more money. In the summer months the temperature can be extreme inside greenhouses.
Under these circumstances it is probably best to open the door as well. Leaving the door open for the whole day should help to reduce the temperature inside greenhouses. Extreme temperatures can damage some plants and cause them to become dehydrated. Once this has happened the plant will most likely die. Therefore it is always best to make sure your greenhouses are well ventilated.
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