The Natural Philosopher wrote:
John Cartmell wrote:

In article , Rick
wrote:

On Fri, 22 Jul 2005 21:09:32 +0100, John Cartmell
wrote:


I'm looking to add insulation to the cavity in a conservatory wall
snip

Having said this, the windows are gonna be a much bigger heat
loss/gain problem.


Very true! ;-)


Well. yes and no. Per unit area, yes, if left with curtains undrawn.

BUT.

(i) Windows are a small fraction of the total wall area

Umm.. It's a conservatory...

(ii) heat gain through them even in winter sun is considerable
(iii) if draightproof and tioghtly closed, use of thick interlined and
lined curtains turns them into a perfect insulation sandwich.

I've got single glazed windows but well curtained and sealed, and
believe me, they keep the cold out. Condensation is the most
problematic in the rooms without open fires

A single glazed conservatory would be cold, whatever. Evene if you also had
insulated roof blinds...