ok so I went and invested in a humidifier which works great
only problem is I cant be there to turn it on and off

is there any way I can rig it up to a hygrostat and a relay
so it switches on when RH is too low and off when it reaches 60%

you tried maplins etc?

i think, if i've got it right... the ambient RH is up during the day to 60ish% (especially since the weather has got warm) and down to 30%ish at night.
measure it for yourself if you have a hygrometer and see when the humidifier is best needed (day and/or night) and use a simple timer on the humidifier. that might do the trick?

is your humidifier adjustable?
i leave mine on a low setting all the time (partly due to avoid fillin it up all the time...)

i think rh of 60%-80% is ok durin veggin (might be wrong though)

ydl

thanks YourDrooganLeader
I managed to get a hygrostat from ebay for £15
wired it up to two 30A relays one to the humidifier
and one to a dehumidifier Bobs ur uncle I dial in the rh
I want and thats it

£15?
nice-one, a well handy bit of kit, will invest in one of them myself, perfect for my needs.
was it from an ebay store?
ydl

one of these just do a search for hygrostat