I have hot water baseboards and an oil furnace I noticed it was hot one day in the house ten degrees hotter than the thermastat should be calling for so I checked to see if the baseboards where hot ( if the arnt suppose to be running then they cool off pretty quick) and they where hot.. So I shut the heat off intirely for 2 days and set the thermastat to 62 and the house never went below 71 in the middle of a freezing winter.. What is going on is the zone bad? Is my thermastat bad? I need help