On Mon, 16 Jun 2014 22:38:54 +0100, Rick Hughes wrote:

On 16/06/2014 21:45, Phil L wrote:


I fear it's loft insulation that causes most of this, heat rises
upstairs through the day and can't escape as the loft insulation is now
up to a foot thick in most cases, CWI, thermalite blocks and dry lining
prevent most of the heat getting through the walls


Just suggested that to wife ... her answer was 'not a chance' too many
gnats would come in ... Plus kids have hayfever .. one of reasons for
Whole House ventilation system with electrostatic filtration.

As temporary solution opened loft door and have desk fan blowing into it
... certainly felt immediate improvement ... so tends to confirm
principle of whole house fan quickly cools upstairs.

Fit one or two Velux windows in the loft, and in summer open them to vent
the hot air in the evening. You can get electrical kits to open and close
them.

Then all you need is a big central loft hatch to allow the hot air to rise
from the upstairs into the loft.

Bug screens on the downstairs windows so cool air can flow in.

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Windows 8.1 on PCSpecialist box