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If you have added People objects to zones, then you will want to double-check your input fields for how occupants exchange heat into the zone:

• Sensible Heat Fraction - Defines split of sensible vs latent heat gain into zone from people. Can be set to constant value by user, or change according to the following activity level schedule input. If you see no latent gains, check if this input is set to 0.
• Activity Level Schedule Name - Sets the total $W / person$ heat gain into zone. The following table below this documentation section gives typical $W / person$ values for different activities from ASHRAE 2005 Handbook of Fundamentals.

If you see no latent gains, check if either or both of these inputs is set to 0. If those are both >0, then something else is wrong. In that case, you may have set your occupancy schedule input field to a schedule that's always 0 (people are never in the zone, so they never add heat to the zone).