Darks made at home and at day time with a cooling controlled camera?

Yes this works well.  With some cameras you may need to use the refrigerator as well   Bias frames can be done the same way.

Check your subs to make sure you didn't have any light leaks though.  And cover the camera with a dark jacket or something similar.  But be sure it still has an airflow.

Yes, it will work for flat darks.  Having a dark library will save you a good bit of time in the field.

I once created a darks library with a DSLR in the fridge and different fridge settings when outside temperatures could have fitted but the temperature was usually too much of a miss and I adjusted the exposuretimes of the lights for a session anyway according to sky conditions so the library didn´t help in the end. What other tools and tricks apart from changing the fridge setting between min. and max. do you mean, Diva?A helpful little programm if darks and lights differ in temperature for a single target is Dark Master v1.15. It sorts the lights and darks into matching groups according to temperature and creates a file group list for DeepSkyStacker. The temperature tolerance can be adjusted manually, default setting is 4 °C (= +- 2 degrees). DSS then stacks the whole lot but subtracts the fitting darks from the according lights.

The sensor temperature of a DSLR changes anyway quite a bit during a session, so if one takes the temp. issue seriously Dark Master could also be used for a normal DSLR session without an existing darks library (in theory, in reality some problems arise which can be taken care of partially lowering ease of handling;  if there is interest it can be discussed further either here or via PN). Here is an example of temperaturechanges for a session of 78 x 70 s lights and 27 darks (usually I only take 15) created with exiftool. There were a few shorter and longer pauses in the lights session so the graph goes up and down a few times.