I mean nothing by it, and don't want to be too harsh, but to be frank and straight forward with you: the time spent describing your house and setup here, and back and forth about doors and having to clarify size, this is all valuable time that you could be finding the snake before he moves deeper into a nook you cannot find.
Unless you find one of us to be a neighbor in your locale to come over and help search, we're not going to be able to help you find your snake.
For the sake of having the best chances of being found, get off the computer and search every nook and cranny, drawers in dressers (don't just move furniture, look indide it), undersides of thing... EVERYWHERE big and small, infront of and behind things.
This just feels like when a person posts a question about a sick snake, every response says "go to the vet" and teh poster waits until the last minute to make a vet appointment thus the snake has to wait another day to be treated. In that case time is health, in your case time is health (due to cold) and is time the snake can spend hiding better than it is now.
Like I said, I don't want to be harsh, only straight forward for teh sake of the snake and for the best chances of you finding your snake, but go search for your snake.