My wife and I recently bought an 1891 farmhouse that has a lot of curiosities and 3am emergency fixes that became permanent fixes over the years. One curiosity is the heating in our living room..
We have forced hot water throughout the house; however, the living room does not have plumbing to a radiator in it. As a "fix," a previous owner put a flat radiator in the basement below the living room with a fan on it to blow hot air into the room through two floor vents. There is a thermostat in the living room (an electric baseboard thermostat) that turns the fan on and off; however, there is an aquastat, hooked to the pipe that feeds hot water into the radiator in the basement, also controlling the fan.
The hot air that comes from the vents warms the room up incredibly fast; however it sometimes gets too hot. I am assuming the idea was that the the thermostat would turn the fan "on" if the room gets cold, and the aqaustat will turn the fan "on" when there is available heat to blow. If either "stat" is not "on" there is no action. That is not the case. The thermostat in the living room might as be a light switch. That fan will run 24-7 if the thermostat is not in the off position - 40 degrees, 90 degrees, it doesn't matter. Of course after there is no more heat to blow, the fans bring up the 49 degree air from the basement efficiently cooling the room down - this might be nice in the summer time, but the Vermont winters are colder than the summers are hot.
It's not ideal, and we plan on replacing it with a radiator, but there are many other items ahead of it. Any ideas on where and how to start to troubleshoot this so it is functional now?