I understand Rafael.  I took over a separate room in the house and use a space heater in there.  My younger son has allergies, so generally we 
keep the house temps around 68F.  Figs were not liking it so bought a space heater for the room.  Works out well.

Any chance of building some type of temporary enclosure around the whole setup?  Maybe with some heavy gauge plastic and 2x2's.  You could
put a small space heater set really low in the enclosure with the cuttings.  Alternatively, you could purchase one of these:

Delonghi Heater

and just place it in front of the set-up.  It was suggested by rcantor in another thread.  I bought one for the shed and it works great.

Danny - I keep my house on the cooler side because I don't like a warm house and to save a few bucks - and because for space concerns, it's best that I have all my rooting/germination done downstairs. I only have one heating zone...but I've done exactly what you suggested above: I've draped a clear plastic painter's drop cloth over the whole shelf system, which includes heat mats. I don't take temperatures inside the shelves - when I open it up to air it out once/day, I can feel higher heat in there - but I assume it's aiding the rooting process since I'm having decent success so far this year. 

Glad to hear about your success, Arne.  I'm having similar success this year and heat is definitely one of the major factors.
Was thinking about it and in Rafael's case he could probably just get away with using his lights and heat mats to produce
enough heat for the whole enclosure.

Danny & Arne

I am not doing an enclosure, it is way too crowded in my bsmt, last year I knocked over my T5s, damaged bulbs, and then there are the figs which are too delicate to breathe on. I think I will try the space heater, although all that dry heat concerns me a bit as well. The grafting tape is definitely helping me with the cloner, I see a couple of buds breaking through the tape. Danny has a covered cloner I believe. But the transplanted cuttings will have to be watered frequently as the environment is very dry, water evaporates real quick in my bsmt. I will probably transition in the humidity chamber to be safe. Transitioning is a separate can of worms and is off this topic-it gave me fits last year. I lost several nice figs in transitioning, but I feel am ready for the challenge this year.