Heating Design tab on Model Options dialog and General tab on the HeatingDesign Calculation options dialog.
The temperature and loads convergence values represent the maximum allowable difference in zone temperature and loads between successive daily iterations before convergence is considered to have been reached during warmup.
Convergence of the simultaneous heat balance/HVAC solution is reached when both the loads and temperature criteria are satisfied. Both tolerances work the same way, one looks at temperatures and one looks at heating and cooling loads. After the second warm-up day, the program compares the maximum temperature experienced in a space with the maximum temperature from the previous day. If those two temperatures are within the tolerance, then it has passed the first warm-up check. It does a similar comparison with lowest temperatures experience within all the zones. If the current simulation day and the previous day values are within the tolerance, then it has passed the second warm-up check. A similar comparison is carried out with the loads tolerance and the maximum heating and cooling loads that are experienced within the spaces. Those are compared individually to the values for the previous day. If they are both in tolerance, then the simulation has passed the third and fourth warm-up check. The simulation stays in the warm-up period until ALL FOUR checks have been passed.
You can select from a range of EnergyPlus inside convection algorithms for calculating the convection between internal zone surfaces and the rest of the zone air in the simulation calculations. More details on this and external convection can be found under Constructions Model Data > Surface Convection header.
EnergyPlus support recommend modelling surfaces wholly contained within a zone as adiabatic and this option allows you to follow this advice. We have found that in practice this option does not make much difference in results or in simulation speed so for most cases you can leave it in its default state.
See also EnergyPlus Errors and Warnings
Note: 'surfaces contained within a zone' are frequently generated when one of the zone merging options is used where a partition or floor which would have separated two zones actually sits within the merged zone. These surfaces do not refer to hanging partitions which are modelled using Internal thermal mass.