This program calculates the maximum heating load required in a space (single zone) so that a furnace can be sized.  Heat transfer coefficients are built in for many types of wall, floors, doors, windows, etc.  Custom values can also be used. The heat needed for infiltration & humidity control are also calculated. Final furnace sizes are tabulated with several values of efficiency.

System requirements
# The heat needed for infiltration & humidity control is calculated
# Final furnace sizes are tabulated with several values of efficiency
# Calculates custom heat transfer coefficients