Depending on how your local electric utility bills these extra charges, they can double your monthly bill for the same exact amount of net usage.
I recommend three separate heating elements, staged by use of a two stage heat, and 1 stage of auxiliary heat... so that 90% of the time you will only be running one of the heating elements.
taken from bayhtr 1405 series
This is the cover of the selection manual showing your BAYHTR1405 series
This selection is in error to the undersized side, but will also keep your electric bill as low as possible.. This means that on an exceptionally windy cold day (once a year for just a few hours) you may run the house as low as 60F or 65F and suppliment with a one or two free standing portable electric heaters.
To size more exactly, a full load calculation on the house needs to be performed, that requires a visit, and measurements etc, most often performed by your local HVAC contractor.
Let me know what you think so far, we can go from there.