When air is free to flow under a house, any hot air will flow out and cooler air will flow under the floor. When there are no clouds heat is radiated into space thus cooling the earth. Clouds reflect radiation back. An electric fan does not cool air. If feels cooler only in the airstream because the moving air increases the rate of evapouration from the skin.
Metals have a larger thermal conductivity than wood and can more easily transfer heat to the hand.
This is much smaller than the 230W needed P5. Power lost by conduction through wall, roof and windows. Thus and Now we need to account for heat lost by conduction through wall, roof and windows while heating. Tutorial 13 Session 2 P1. Tutorial 14 Session 2 P1.