Aaaagh, my room is being kept out of direct sunlight, with a ceiling fan and a small clip fan blowing across the water surface but it's still at 29 degrees (usually 25)....

Any suggestions as to how I can cool it ?!?!

Damn this hot weather !

theres a couple of things you can do if you arent already.
leave lights off
fan blowing across the top
air pump with air stone may help a bit
clean plastic bottle filled with cold water, put in freezer over night then float it in the tank

Also turn the thermostat on the heater down a touch in the Summer, and make sure the outflow of any internal filter pump is flowing over it as well to disipate heat as internal pumps generate heat themselves.

i turn my heater off right through the spring and summer months

Turn the aquarium heater completely off. Add bottles of cold water to the tank as well as ice cubes, this should deal with the problem for the mean time.

What good will turning the heater off do?, its on a thermostat so wont come on anyway.

this is what i thought too.

it won't come on but i don't see the point in having it plugged in if its not being used

So if the temperature falls as it did Monday night, it will come on !!

Exactly. You don't need to unplug the heater in hot weather as it won't come on anyway. Keeping it plugged in still is a safeguard if the temperature drops though.

The warmest my tank's ever been was 90 deg. in 2003 when we had record temps. and my fish were fine still. More active and hungry though!

my unheated river tank reached 32c in the last few days, its usually at 21-23c. I turned off their aquarium lights, and performed daily water changes and they coped ok, I was worried for the Sewellia sp I have, that need cooler temperatures, but they all seemed ok and were active as normal, the temperature has dropped back again now though.