we are excited! The quality is very good.We use the small greenhouse for overwintering potted plants and our have set it on the balcony. As underground, we used polystyrene, a coconut mat and a board. The shelf is not required, the appropriate on the one hand and a picnic table on the other hollow blocks with a board over it. Both sides are now a number of potted plants, daytime burning over time a lamp circuit. We are monitoring the temperature via a simple wireless thermometer, previously we had the door open on the day. With the heating we are testing different methods. The mitgekaufte frost guard seemed not suitable, because the heat that's not so well distributed. We are testing at the moment a simple electric heater with thermostat and fan, on the lowest level, actually it was not urgently needed because of the mild temperatures. A bubble wrap is available for superimposing on frosty nights. What is a bit disturbing, is that condensation may form when heated, but that's normal, and we ventilate during the day. If necessary, we'll have to cut a window on the back, as recommended by another reviewer. We are excited to see how the matter further works, the winter will be probably a little colder.