Weather has changed dramatically in the last few years, Heavy winters have severally damaged our crops. The belief that in our country we have many places with a "perfect climate"has led many growers to think that they don´t need heating equipment and had suffered the consequences of such "perfect climate".When temperatures are too low,plants reduce their metabolic activity,growth slows down, the leaves are smaller,foliation gets late and the fruits grow smaller too, on top of that fungus problems may appear.Greenhouse producers need to have optimums conditions for vegetable production. You don´t need a heavy winter to ruin your crop,all you need is a few days at 10 oC.