Well I am very sure that the population will get lesser and they will move to your next door neighbor !!!
There are a few reasons why your birdhouse room temperature are above the the 28 degrees centigrade. The most important is due to the outside temperature. During noon the sun is at the highest and the amount of energy it provide to the building is great.
The other reason is when your house is designs wrongly where the sun directly hit both the side walls (the larger surface area) in the morning and in the everning.
The rooms must also have enought ventilation holes to draw the cool air and a proper exhaust to remove the hot air out.
One of the method to reduce the birhouse tempearture is to use a roof top turbine ventilation fan..
Technically the fan use external wind velocity to turn and this is how it works:
The ventilation fan works by utilising the velocity energy of the wind to induce air flow by centrifugal action. The centrifugal force caused by the spinning vanes creates a region of low pressure area which draws and throws out hot air from below and fresh cool air from out side comes in. The slightest breeze will cause the turbine to spin and even after the breeze has stopped, the fly wheel affect of the rotor cage will use its stored energy to continuously remove air giving rise to ventilation. Suction is maintained even at low wind velocities. The Convective Thermal currents are given boost by venturi dome to further enhance the rotation of the fan.
I believed that this might help birdhouse user to minimise their electrical cost since it operates by external air velocity.
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