I am trying to understand the dynamics of heating a home after the furnace size was calculated.
Say you have a 60000BTU furnace to heat a 2000 sqft home. 
At the beginning of the heating season you brought the in house temperature near the point set on the thermostat and since then the temperature has been fluctuating around that value as the house lost heat and that was compensated by the furnace

At this point I have two questions:  

-how do you set how much the temperature can drop before the thermostat calls for heat?  

-How can I calculate equivalent temperature rise of let's say 1000BTU/h delivered in an 1000 cubic feet volume?

The point with my last question is this: if it is possible to configure the temperature drop before the thermostat calls for heat I would like to know how long the furnace will have to work to bring the temperature back to the set point