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bob wrote: you are some Einstein!! i couldn't work that out for the life of me!!

Actually this has been explained before. Maybe you forgot - and it seems you still don't understand.
Or were you going to place a plastic screen, sealing off the window sill from the rest of the (air in) the house ?

Apart from it not being too practical to place loads of humidity trees on the window sill - the water needs to be in the air, not in the tray. The amount of water LB mentioned must be evaporated to get that higher humidity level. Then still that is only temporary, the air will mix with the dryer air in the rest of the house. Even if the water in the tray would evaporate quickly enough, which it won't, you would continuously be refilling the trays.

leatherback wrote: From the graph at you can then read that, at 20 degrees celcius (room temperature) you need to increase the amount of water in the air with almost 6 grammes of water for each cubic metre of air. For a room of 5*4 metres that would result in 5*4*2 = 40 cubic metres, times 6ml = 240ml. So you would need half a pint of water extra in the air. Just for the room.

Incredibly useful link. It was said in this thread that it had been posted before, but for me it is the first time... Thanks... I know I would make some use of it alright

alainleon1983 wrote: Incredibly useful link.

Good to hear I have actually for once posted something usefull