"sPoNiX" wrote in message
...
My house is very hot, especially upstairs. Even with the windows open
and a fan blowing it gets hot as the fans just blow the heat round and
round the room. What's needed is somewhere for the heat to go.

I was thinking, could I fit small unducted extractor fans in the
upstairs ceilings such that they blow the heat directly into the loft?
Cooler air would then be drawn in via the windows making the room
cooler.

Is there any problem with blowing air directly into the loft in this
way? Would it cool the upstairs rooms or make additional problems?

The hole into the loft space would allow warm moist air to enter in winter
creating condensation up there. Try doubling the insulation up there using
Rockwool, aim for 250-300mm in total. This prevents heat from entering the
rooms below from the baking hot loft. It also keeps heat in, in winter.
Then any heat gain in the upstairs rooms will be taken away via through flow
ventilation from the windows.

My loft has heavy insulation and the upstairs rooms are far cooler than the
neighbours as a result. last August the were uncomfortable at night, while
were just right.