How to have a Cooler Home with roof ventilation

Cooler Home in Summer Months

Often it is presumed that just ventilating the roof is going to give you a cooler home whereas in reality is only half the story.


Rooms with ceilings of 3 metres in height are going to be cooler longer than those at 2.7m ceilings and 2.4m ceilings being less again.

Rooms in houses with raked or cathedral ceilings will be warmer than those having an attic void above them.

The homeowner needs to feel confident that roof ventilation is a worthwhile and is going to be a cost efficient exercise.


To help explain consider this,

Take a bucket, fill it with water.
If the bucket has a hole in it then the water is going to escape as the hole allows, the bigger the hole the faster the escape.
The water escape is aided by gravity because of it’s density.

Turn the same bucket upside down and fill it with heat, the heat is going to escape as fast as the hole will allow, the bigger the hole the faster the escape.
The speed of air escaping is governed by the temperature, the warmer the air, the faster the movement upwards.

Now imagine the bucket being a hot air balloon and you pour heat into it.
The warmest air is going to be at the top of the air balloon, and is the energy that causes the balloon to rise.

Put a hole in the top of the air balloon the heat (energy) is going to escape bringing the balloon down.

The same hole in the roof allows the escape….and the device protecting the hole is called a roof ventilator.
Cupola is when mounted on the ridge of the roof.

The efficiency of the roof ventilator is based on it’s design and all roof ventilators are not equal in performance.

To gain the optimum performance out of roof ventilation….read roof ventilator comparison.

Condor Kinetic

Cooler home by ventilating the roof space
Condor Roof Ventilation variables used by passive Condor roof ventilation system

Similar Posts