I have fans going to along with frozen water bottles 

I wish it only got up to 30degrees here in australia in summer, we get days where it gets up to 40 or more and it is so humid you cant breath, when it gets hot here I have frozen water bottles in each cage one bottle per pig per cage, also a dish with a low side that has ice cubes in it so they can chew and lick the ice and also lie in the dish when it melts.
I put my pigs outside in hutches a few weeks back as I needed somewhere to store my new bathroom suite while waiting to have it fitted. It was installed yesterday. Not moving them back into it their hutches are covered in insulated thermal foil which has a white outer which is keeping them very cool when in thier hutches. I put thermometers in and its only 18c inside a hutch with four pigs in. they do spend a lot of time in thier runs in complete shade white sheets reflect heat well. Also give them frozen bottles freezer is full of them.
Got it from the army store's huge rolls for a couple of quid. I stripped the white coat of it to do my shed well worth a visit to one if you know of oneWhere did you get the foil from? I've got some of those reflector foil things you use for car windscreens, and also a large reflective sheet that I use to keep the car cool when doing dog shows etc. - had been wondering about using this for the piggies, you can buy it by the meter
Something else I've started doing is giving the pigs fresh water twice daily. If the weather/environment is warm, the water warms up quickly too and I know my pigs are not keen on warm water - they drink more cool, fresh water. Drinking water is important in warm weather so if it means refreshing the water bottles twice daily, then it's an easy way to encourage the pigs to stay hydrated.
Also clean the bottle more frequently in hot weather, especially scrubbing inside the spouts. Pigs tend to spit bits of food up the spout, so to prevent bacteria multiplying you need to keep the bottles clean to make sure the pig actually gets clean, fresh water!
I have tried the frozen water bottles and mine dont seem interested is it worth giving them a quick spray with water from a spray bottle or is that bad for them?
I'd rather not spray a piggie with water since, if they become too cold, it will be difficult for them to maintain their temperature.
You could try taking two towels. Wrap the first around the frozen bottle and put it into the cage. The second towel can then be draped over the water bottle to make a tent/a cool hiding spot.