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Zone Air Heat Balance Internal Convective Heat Gain Rate includes many components. At night most of the normal gains are zero. One of the others may be negative. If you see one of the objects below that are included in your input file, you can investigate further. Although some of these do not appear to be in the internal gains group, some of these objects have parasitic electricity use that would become internal heat gains or those that reject heat (e.g., motor heat from a fan or controls for a coil) to the space would also become a zone heat gain. If you cannot find which of these is causing the negative heat gain then the input file will be needed to find the culprit.

ZoneIntGainDeviceTypes:
 { "PEOPLE", "LIGHTS", "ELECTRICEQUIPMENT", "GASEQUIPMENT", "HOTWATEREQUIPMENT",
   "STEAMEQUIPMENT", "OTHEREQUIPMENT", "ZONEBASEBOARD:OUTDOORTEMPERATURECONTROLLED",
   "ZONECONTAMINANTSOURCEANDSINK:CARBONDIOXIDE", "WATERUSE:EQUIPMENT",
   "DAYLIGHTINGDEVICE:TUBULAR", "WATERHEATER:MIXED", "WATERHEATER:STRATIFIED",
   "THERMALSTORAGE:CHILLEDWATER:MIXED", "THERMALSTORAGE:CHILLEDWATER:STRATIFIED",
   "GENERATOR:FUELCELL", "GENERATOR:MICROCHP", "ELECTRICLOADCENTER:TRANSFORMER",
   "ELECTRICLOADCENTER:INVERTER:SIMPLE", "ELECTRICLOADCENTER:INVERTER:FUNCTIONOFPOWER",
   "ELECTRICLOADCENTER:INVERTER:LOOKUPTABLE", "ELECTRICLOADCENTER:STORAGE:BATTERY",
   "ELECTRICLOADCENTER:STORAGE:SIMPLE", "PIPE:INDOOR", "REFRIGERATION:CASE",
   "REFRIGERATION:COMPRESSORRACK", "REFRIGERATION:SYSTEM:CONDENSER:AIRCOOLED",
   "REFRIGERATION:TRANSCRITICALSYSTEM:GASCOOLER:AIRCOOLED", "REFRIGERATION:SYSTEM:SUCTIONPIPE",
   "REFRIGERATION:TRANSCRITICALSYSTEM:SUCTIONPIPEMT", "REFRIGERATION:TRANSCRITICALSYSTEM:SUCTIONPIPELT",
   "REFRIGERATION:SECONDARYSYSTEM:RECEIVER", "REFRIGERATION:SECONDARYSYSTEM:PIPE",
   "REFRIGERATION:WALKIN", "PUMP:VARIABLESPEED", "PUMP:CONSTANTSPEED", "PUMP:VARIABLESPEED:CONDENSATE",
   "HEADEREDPUMPS:VARIABLESPEED", "HEADEREDPUMPS:CONSTANTSPEED",
   "ZONECONTAMINANTSOURCEANDSINK:GENERICCONTAMINANT", "PLANTCOMPONENT:USERDEFINED",
   "COIL:USERDEFINED", "ZONEHVAC:FORCEDAIR:USERDEFINED", "AIRTERMINAL:SINGLEDUCT:USERDEFINED",
   "COIL:COOLING:DX:SINGLESPEED:THERMALSTORAGE", "ELECTRICEQUIPMENT:ITE:AIRCOOLED",
   "COIL:COOLING:DX:SINGLESPEED", "COIL:HEATING:DX:SINGLESPEED", "COIL:COOLING:DX:TWOSPEED",
   "COIL:COOLING:DX:MULTISPEED", "COIL:HEATING:DX:MULTISPEED",
   "ELECTRICLOADCENTER:STORAGE:CONVERTER","FAN:SYSTEMMODEL"}