Welcome to the Forum Lazic. Sorry to hear you are having difficulties with your temperature. I just smoked some sausages before Christmas and the temperature outside was an issue for me too. I smoked in my Bradley for around 2 1/2 hours at around 140'F. Removed the sausages and placed on cookie sheets in a preheated oven at 200'F with my meat thermometer probes in a couple of sausages. Once they reached an IT (Internal Temperature) of 155'F I removed from oven and into ice cold water bath. After 10-15 minutes removed from water bath and hung in the basement to bloom. I find using the oven the simplest and quickest way of cooking/smoking my sausages.
Also, as mentioned by Johnny I have done the same, instead of cooking in the oven I did the Hot Water Bath, a very good method. Just keep the water from boiling and try to maintain an even 80'C (176'F) without going over the 80'C/176'F temperature..