DH202020, on 25 November 2015 - 05:44 PM, said:
So, has anyone Been successful with internal blinds cutting down heat build-up? If so, what sort...plain and simple or massively complicated?? (we are intending to fit some sort of blinds anyway)
I did a rough and ready experiment with an East facing bedroom window that was causing that room to massively overheat (as in get up to over 30 deg C) in the mornings (aided and abetted by heat leakage from the thermal store in the room next door).
I pinned a bit of old white sheet up across the window and it reduced the room temperature by roughly 5 deg C, so I reckon that shows that internal blinds can work fairly well. The secret is to make sure that the outer face of the blind is light coloured, so it reflects back a fair bit of radiant heat. Even double soft E coated TG still allows a fair bit of radiated heat to pass outwards, and if the blind is close to the glass this can be quite effective.
We've opted for Roman blinds in these rooms, with blackout internal linings but cream coloured window facing linings, in the hope that they will help to reduce solar gain.
One thing I have found is that the major heating effect from solar gain is the sun heating up objects, the floor and walls in the house, with these then radiating, conducting and convecting heat into the rest of the house. The worst culprit in our house is the dark grey granite window cills in the kitchen. These can get almost too hot to touch and then act like very good radiators.
Edited by jsharris, 25 November 2015 - 06:21 PM.