Lroom thermostat is 2 degrees too low.  Thermostat set at 52 is really 54.  Kitchen is continuous 1 degree warmer than Lroom -- not 3.  Veranda maintains +2F (56F) when outside temps hover around 30F (dipped to 28 last night).

Thus,  dTvo and dTlo hovered around 20 last night.  Radiators feel somewhat warm meaning furnace has kicked in.  Might need thermometers on radiators.

Todo: Buy more thermometers.