Solar control for windows/roof lights

[the_hermit]

Does anyone have any experience reducing the solar gain from their windows and roof lights?  E.g. using window film, low u-value glass and/or external shutters?

What and who do you recommend?  How much did it cost and when?  We have a fairly standard south facing ED terrace with Velux windows (internal blinds only), a roof light, uPVC double-glazed sash windows and wooden double-glazed french door all fitted 2015ish.

Trying to future proof the house against future hot summers without resorting to air con.

Edited August 11 by the_hermit

[marctt]

You'll get large thermal swings with south facing glass, even triple glazed and high efficiency glass. Spent some time in a grand designs listed property with modern high tech glass extension and still had huge thermal swing in the extension.

Shutters and awnings that shade the windows are most effective.  Temporary canvas sail type awnings are low cost and effective (will need replacing every few years).

For upper floors internal cheese cloth style roller blinds are low cost and effective at reducing sun glare heat.

For Velux, the black out blinds with the reflective layer significantly reduce heat, though they also stop the light.  We had the external Velux motorised shutters at previous house and they made a huge difference to thermal gain and lose, but blocked the light.

For fixed roof windows, try hanging an oversized internal white canvas shade.

Weather permitting, open loft / upper floor Velux windows and lower window to use chimney effect air flow from ground to loft to help cool house.

Hope this helps

[Peckhamgatecrasher]

Sash windows are quite effective at reducing heat, but they must be open at the top as well as the bottom to promote good air flow. 

"...they create great convection, cooling and ventilating a room more efficiently in hot weather."

Home Building & Renovating website