Let me add more details. This is a hot water boiler with radiators. The boiler has 2 circulators and a hot water heater connected to it. One circulator (A) is to a single added on room, circulator (B) is to the rest of the ranch style house, and then the water heater stands alone. We get plenty of hot water and A room is right on the button. It is B that we have a problem with. The thermostat is set on 80 because any lower and we get heat in the 50's. The serviceman came and pushed the boiler up to 185 degrees, as high as it would go. This gave us hotter water and very good heat in A but did nothing for B. We then had a new thermostat put in, still no change. The pipes have been bled, no change. That's when I got the comment about the furniture blocking the radiator but when I moved some furniture still no change. The temps have been unusually cold here in CT but still a brand new system should keep us warm.