The old argument about cooling again. I just think if your not breeding this year with this male, and you think something is wrong, heat it up, feed it, and monitor it. Take action if things dont improve in a reasonable time frame (a few weeks). Cooling this male this year wont affect next years breeding, so just heat him up and feed as normal. For you to post this thread you must be concerned, so this is your best option.
I also have cooled carpets in the past by turning all heat off, and had no notable weight loss, infection etc, and the female became gravid. I was in Goondiwindi and temps in the cage droped to 3-4 of a morning and ranged from 13 to low 20's during the day and I left them like this for 3 months, july, august and september before heating up again (by this time I noticed the female was already gravid). I have never yet seen a carpet sunbasking in winter and I belive they hide away for the duration, therefor i treat there cooling as such. An insulated bed room or snake room is just as insulated as a deep earth crack, hollow log or rabbit burrow, so I turn all heat off and leave it to nature. I know plenty of people that do this as well with years of sucsess.
Im not saying by any means you have to cool this much to breed, but im saying that in my experience and in the experience of many others, turning heat off, and letting them get cold, will not make a healthy carpet sick! I belive not cooling a snake properly is much worse if you stop feeding them. As ive said before, if the snake isnt cold enough, its metabolism is still charging along, and if you stop feeding( which most people do when cooling), it will loose condition.
I love the way some say "in the wild on cold days they will sunbake and get warm", well what do they do in stanthorpe or gundy or lismore at night when the temps are 1 or 2 or minus 1 or 2??????? and days are like 10 or 15 MAX. I bet you wont be seeing carpets out sunbaking!!!
I dont know how they are going to maintain the ever so popular "safe minimum" of 15 or so.
At the end of the day, this argument will go on and on, as we only just finnished a thread on cooling last week... In my opinion, to solve your problem with your male carpet, heat him up and feed him up if needed, monitor weight, and if you have further weight loss problems worm or see a vet. Also look out for infections like canker, pneumonia and the like, it could be causing the problems... both can be caused from inapropriate heating/cooling techniques. Both will require the heat to be turned back on, this may be enough in mild cases, antibiotic treatment may be needed otherwise...... After all this, your snake is probably fine, just giving you some things to look out for. I wouldnt panic too soon.
Craig