You presume? Is that a statement or a question? If it's a question I can't imagine why I would know. Even if there was heating, a wind which needed five layers of clothes for adults would have been blowing across those kid's backs for 45 minutes and they only had pj's on.
I've um err um read all the tut um statements. Matt thought there were two windows in the room, he got the colours of the curtains wrong and he found a non existent bookcase in the apartment. Very observant. Even he would have felt the wind blowing out the bedroom door I imagine. If it was as cold as we've been told he should have heard the twin's teeth chattering, let alone spotting them breathing.
The McCann's and friends were OUTSIDE that is why they needed layers of clothes, the twins were tucked up in their cots with the heating on. The wind wasn't constantly blowing through the window, as Kate said thee was a sudden gust of wind which blew the curtains out.
If the 'um err um' is a reference to Matt's statement, I would point out to you that everyone uses those when speaking, we don't even notice we are doing it, they had to write down everything said. Listen to Prince Charles the next time he does a speech.
Thing is, Matthew was concentrating on looking at the twins, he saw them they were breathing, there was quiet in the room, he thought they were all asleep, he also thought the room looked light as if the moon had come out.
All your reference to the twins shivering etc. has no bearing on this what so ever.