Their house was always quite cold whereas ours seems to be like an oven in the Summer (not much that can be done except air it in the evenings). A couple of days ago the gauge was showing about 28 degrees so I bought a new thermometer in case it was broken. It rose to 29 degrees so we unplugged the heater (which was on only 18 degrees anyway and the lowest it goes to!) but this evening its gone up to 30 degrees!

I just don't know how to cool the water short of putting ice cubes in there!!
Any help would be greatly apreciated
Thanks
Helen