Reducing house heat build up from sun

Reflective White line paint often has glass beads in it. Don’t see why you could not paint your render with it though it might be fairly expensive .

GH

Putting a fan in a redundant chimney is an interesting idea, but if it really is redundant then why would you be concerned about the pargeting? ... and chimneys are supposed to be rather good at convection without a fan There's also a consideration of the number of days when it's likely to be of use, set against the effort to do whatever mitigation strategies are implemented.

I'd got the impression that chimney lining pargetting was very hard, perhaps cooked by earlier decades of coal smoke and I could forsee huge slabs of it falling down the stack. There is an existing sliding vent panel in the upstairs part of the stack, presumably blocked up fireplace, but its the loft , with no vent that gets fiercely hot

Road line paint seems to need applying hot, presumably for traffic wear reasons.

I saw something that said a mirror finish was only 5% more reflective than white paint. Paint is cheap, so...

Theo

Golly.

I just have a massive concrete ground floor and several years in Johannesburg.

A cold beer is cheaper

I was about to say similar. White is amazingly reflective. Abnd cheap

Pleased to report that cladding spaced of 25mm from 60mm foil faced celotex seems to be doing a pretty good job so far :-)

Might be a problem if the chimney ever gets used for its intended purpose in the future.

There is also the issue of pumping out air that needs to get replaced from outside - sometimes that can work against you. Perhaps a bit of intelligent control to choose the direction of most cooling would be useful.

Awnings over windows, and sash windows.

Like the usual brieze solaire, only intercepts the midday sun. My "African" sail shades cover the whole windows upstairs and separately downstairs for midday afternoon and evening , with dark woven material a foot or more away from the glass. Amazing how hot the material gets in full sun, too hot too touch comfortably. The gap and open weave to let any wind , take it away, apparently the wrong wavelentgth by then to penetrate the glass to any great extent. I keep forgetting to test the glass temperature with a non-contact IR thermometer in full sun. Half the people around me have closed sun-facing curtains , vertical and venetian blinds, but internal to the glass which barely works I'd have thought. The shutters or cloth need to be on the outside.

If the air gap between window and curtain is reaosnably well sealed, it creates an insulating barrier

You do realise the colour for peak energy from the sun is nominally green?

After reading the article you'll find YMMV!

Hottest yet in E Anglia. I went shopping n +36°C and Waitrose car park was positively nostalgicly African.

My cape town sister has her wood burning stove going

I s*it the windows and drew the curtains and kept the inside upstairs down to 31°C

Even the normally cool living room with its massive open fireplace and solid concrete floors made it to 27...

It really is quite pleasant all in all. After a miserably cold winter

Very big, Africa.

Nairobi was idyllic. Being a mile up helps, I believe ?

Watamu on the east coast - a hell hole.

Even S Africa had 4 distinct climate zones. High veldt, Low veldt., desert, and Mediterranean.

I lived on the high veldt. 5000' ASL. 87 octane petrol. Gutless cars. Hot and dry in summer, with a massive thunderstorm every second day, and cold and dry in winter

Even Africans didn't like Durban. 35°C and 100% humidity. That's why its full of Indians from e,g. Goa.

Is that effective in keeping the sun out?

Your rectum and your toilet must be HUGE! :-)

well generally speaking sun does not shine into rectums :-)