David ...
Let me answer your last question first ... yes, this post goes to all as it is on a public forum. Anyone can read it and answer it.
6C = 43F and 14C = 57F.
From what I have read, temperatures lower than 13C or 55F will harm a dracena, so at 14C the temperature is just above the point where it could cause harm to the plant. These plants are happiest if kept at about 24C or 75F.
Normal humidity is fine, but you can mist the plant to increase the humidity around the plant.
I found this site on Google that has a lot of climate information for Jerusalem that shows temperatures in both Celsius and Fahrenheit. It appears that Jerusalem has a cold zone similar to the US cold hardiness zone 10 which has a cold hardiness temps between 1C to 4.4C or 30F to 40F.
These hardiness zones are for outside temperatures.
http://www.jerusalem.climatemp...
There is a lot of good climate information on that site that should help you answer some of your questions in general.
I don't grow houseplants as I heat with wood and parts of my house are warmer than others and maintaining the proper temperature is tricky for me, much less for plants. Wood stoves don't have thermostats, so how one builds one's fire and the kind of wood used makes all of the difference ...
I hope this helps.
Smiles,
Lyn
PS ... if you want a specific person to read a response all you do is type
@username. In my case you would type
@RoseBlush1. I will receive a system message that you have typed a response to a post I have made.
