When is it necessary to insulate heating ducts?

[Garald]

That's pretty much the question. 

 

(Longer version: I got a set of energy-efficiency diagnostics done by a company - it's a precondition for getting subsidies for, well, making one's place more energy efficient. What I got states basically nothing that my architect and I didn't know or hadn't considered - except that it also suggests we insulate the heating ducts. My architect says she doesn't see the sense in it, for the kind of heating system and the kind of place I have - whatever heat leaves the ducts heats that which is supposed to be heated by the heating system.)

[SteamyTea]

9 hours ago, Garald said:

whatever heat leaves the ducts heats that which is supposed to be heated by the heating system.)

It is about finer control of the heating distribution.

There is not 'one size fits all' method to this, so certain generalisations have to be employed.

Just stick to the rules and guidelines and all will be OK.