For old houses in my opinion the most important step is to determine what size heating system you currently have and ask yourself how does (or did) it heat the house. There should be a label or tag that indicates Btu input and Btu output: the input number is how much fuel/electricity the furnace/boiler will use and the output is the Btu which is put into your house. Dividing the input by the output gives the efficiency of the device, a higher efficiency system will use less fuel for any given amount of heat output into the house.
Since old houses tend to have less insulation, leaky doors and windows which the charts don't cover well, the heating people will tend to install larger systems to handle the unforeseens and unknowns. My house is 100 + years old and I recently replaced the old 100,000 Btu furnace with a 60,000 Btu unit. I felt confident in doing this since the older unit had very short on times even in the coldest windy nights. I am very happy with the smaller unit - it was cheaper to buy and simply runs a little longer on cold days/nights but the house stays warm.
The heating person should be able to work through the sizing charts or whatever they use and explain it to you. However, you have your current system as a baseline.
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