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normall it has no specific standard. If it is between a conditioned space and exposed area then we can take it the average. If it is between two conditioned spaces then we can take 5 Degc plus. If it has a heat source then it depends on heat source. If it is just a storage than we can use average between the temperatures.
it is depends up on the maximum peak load of summer seasons it may vary from country wise
Hi,
depends on which city and which country
their are tables for this temprature