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why my zone have heating load in summer?

I have a greenhouse zone that is controlled with an ZoneHVAC:EvaporativeCoolerUnit and ZoneHVAC:Baseboard:Convective:Water that coupled with hot water plant loop. the thermostat adjust the zone temperature between 16-18 deg C.

Sometimes baseboard sys and HW plant loop are on when There is cooling load , but EvaporativeCoolerUnit is always off when there is no cooling load. image description

why my zone have heating load in summer?

I have a greenhouse zone that is controlled with an ZoneHVAC:EvaporativeCoolerUnit and ZoneHVAC:Baseboard:Convective:Water that coupled with hot water plant loop. the thermostat adjust the zone temperature between 16-18 deg C.

Sometimes baseboard sys and HW plant loop are on when There is cooling load , but EvaporativeCoolerUnit is always off when there is no cooling load. image description