Hello Everyone, I am calculating heat load for a house in Nepal. But i am bit stuck. is it necessary to calculate the heat loss from the ceiling of a certain room of ground floor because the ceiling of that room is common to another room which is anyway going to be heated and there is same temperature above that ceiling and below that ceiling. so is it necessary to include that ceiling in which the room below and top of it is going to be heated?? what about the partition wall which is similar to above situation. please suggest me something i am running out of time for heat load calculation.

If it is the same temperature on both sides of the ceiling or wall, then there is no heat loss to calculate.

I have a similar question in terms of heat load calculation: Assuming I want to have the same temperature throughout the house is it anything wrong to consider the house as one big room and taking into consideration only the roof, exterior walls, windows, doors and the slab/basement floor into account?  Would it be wrong to ignore the interior partitions as in most of the cases they are not insulated anyway (they may have soundproofing, but the insulation would not be the same as the exterior walls anyway) ?

Basically I consider the house as one entity to heat/cool as I want the same temperature throughout the entire house. Even if the heating/cooling is zoned, because of very low or nonexistent insulation on the interior partitions on the long term the temperature will be even in the entire house (maybe with the exceptions of the low insulated areas like windows and doors where there will be a difference of a few degrees but negligible) as the heat transfer is faster within the interior space.

Note: I agree that, if for instance I have an uninsulated/unfinished basement then this would require a different approach.

It is called block load. The accuracy, in terms of total load, is a matter of fact. Comfort is a different issue all together and why we do room-by-room heat loads.

Much depends on the heat source. If you are heating with forced air you will probably not notice the difference.