I have brought this frost guard for my luggage tag. In this electronic equipment is mounted, which is not cool below 0 degrees because of condensation. As experience shows that the built-in thermostats are not very sensitive, a plug thermostat was preceded with a from / to control. Hanger size 2.30 x 1.10 x 1.50 ie just 3.8 m3. Of these, more than half with Techik is full, Blank so about 2 m2. At outside temperatures currently around -1 degree, the heater ca takes 20 minutes to get the temperature level of 2 to 8 degrees to raise. I feel too long. Remedy would create here a device with built-in fan, welchses rapid distribution of heat. So it accumulates very above and yet expresses itself as gradually to all corners.
As I said, the unit is working, ok for small spaces, a small fan would have accelerated in gutgetan and the heat distribution.