To obtain the first crop of vegetables, a certain air temperature must be maintained in the greenhouse. This will help the "Lazheboque" heat accumulator, which is a sleeve made of black polyethylene. Water is poured into it. During the day the battery warms up, and at night slowly gives off heat, raising the temperature of the air in the greenhouse. It is easy to use, inexpensive, and efficiency can be estimated from reviews on the heat accumulator for greenhouses Lazheboka.