Response from Steven:
Sorry about the heating. Our furnace has broke down on the first day you lived, and it has been fix temporarily that night. It turns out that we should replace some part of the furnace and this device is hard to be ordered. The maintenance person told us to use the furnace as less as possible before it be replaced, otherwise it will be broke down again. However, We replaced the whole furnace yesterday and the heating is great now. I am really sorry for that.