Bought as a frost guard for the plants in the garden house (double wall) this device. The garden house has the dimensions B 2.2 x D 2.4 x H 2.4 m. The heating is switched on being assigned to frost guard, even at a temp. Of + 9 ° C, at. Have tried everything and have decided me after long for another device. Conclusion: The temperature setting is flawed; switched on, even at temperatures of more than 9 ° C.