Adding a trickle vent to PVC window - will it reduce condensation?

[GalaxyInMyPants]

We live in an old Edwardian semi with no cavity wall.

We have a condensation problem in the winter. We've done everything we can do reduce this. We don't dry clothes inside, we have a dehumidifer running 24/7 as well as those smaller moisture traps on windowsills.

The living room is the worst with condensation in the big bay window.

I think we need to improve ventilation but its too cold in the winter to leave the windows open.

I'd been thinking of getting a positive ventilation system fitted but it looks pricey.

Then I read about trickle vents. Would this help? Is it just like having the windows on the night latch and therefore make the room cold? In which case there's no point. Any other ideas?

We had trickle vents put in to upvc windows in our last property due to damp and condensation. It made a slight difference but certainly didn't cure the problem. They can be left open all the time, but in the winter you can definately feel the cold air coming in from them.

Thanks. Some more googling suggests it won't be any different than leaving the windows on the night latch. So we're buying a log burning stove to see if having the room warmer and drier will help....plus we might be able to leave the windows on the night latch if the log burners keeping he room warmer.

the advantage of trickle vents is that people are more likely to leave them open, so they can do their job.