If the indoor temperature is less than the desired temperature, then the optimum stop time is LE:

Where:

LE

=

Latest end time from SSTO command.

If the indoor temperature is greater than or equal to the desired temperature, then the optimum stop time is:

OE - ((25 * HR * d) / f) + AE

Where:

OE

=

Occupancy end time from SSTO command.

HR

=

Heating retention coefficient (hcoef2) from SSTOCO command.

d

=

Indoor temperature minus the desired temperature.

f

=

Outdoor temperature minus the desired temperature.

AE

=

Adjust end time from SSTO command.