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No. They're very cheap.
I'm trying to draw up a long list of things to help with winter energy bills.
I'm hoping trickle vents will help to reduce moisture on the cold external wall of the house and prevent/reduce mould.
hugo7-
I’d have a check, even the cheapest windows usually have them. It’d probably be a lot more cm2 opening than a trickle vent though I guess.
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If its just one window you want to have sort of some air movement past then just adjust all the catchs to be looser (summer setting is what id call it!). So even though its closed and locked small amount of air gets around it. Let's in more noise than regular trickles though, they have some pond pump filter material inside too dampen noise.
Got some new window deliberately without trickles so kept the noise out better. Massive improvement over the old budget windows. However the downside is it's approaching airtight so have to defo open them to vent a fart ridden bedroom out in the
morning.The seal around the perimeter of many dg windows is the same stuff you can buy a tub of it from toolstation thats enough to do 3 or 4 windows for about £22 which defo worth doing it your windows are more than maybe ten years old. New rubber is nice and supple so after some adjustments you can get an almost air tight experience.
Apparently is a good idea to loosen off window adjusters for summer anyway as puts less pressure on the seals, especially when very hot as allows not room for units to move/expand /contract with damaging the seals.
dbr
BrickMan
Don't the windows have a "tiny bit open but locked" setting?