By positive pressure i mean that the air pressure inside the house is higher than outside pressure which tends to push air from inside to outside.
Positive oressure ventilation reduce attic temp.
Based on the duty cycle of the fan coil.
However with that understanding that creating negative pressure in the attic can cause all kinds of problems sucking out air from the conditioned space possible back drafting.
At this point the investigation is essentially complete.
That would only create problems at other times of the year.
The normal indoor humidity range in winter should be 15.
They have thermostats that turn the fan on at a recommended preset temperature of 100 110 degrees.
In existing homes the question is important.
Ideal attic temperature and humidity settings.
You can bring in outside air and get positive pressure in the house in one of a few ways but the main way that home builders do it around here is by using the air handler unit ahu in the heating.
Positive pressure ventilation affects preload afterload and ventricular compliance.
I have advised him that generally speaking attic fans are a bad idea which he has come to terms with.
The net effect in most situations is a decrease in cardiac output.
If the home doesn t have ducts there still may be reasons a homeowner would want to reduce the attic temperature.
Again i m assuming that you re not considering a sealed attic lowering the temperature of an attic that contains ducts can reduce your air conditioning costs.
Alternatively install passive vents such as gable soffit and ridge vents which are openings in the roof that allow hot air to escape.
Install electric ventilators and attic fans which remove hot air from an attic.
However the effect may be beneficial in the context of decompensated heart failure where the decreased preload and afterload result in a return to a more productive part of the starling curve.
Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents.
My father is interested in removing heat from his attic to try to keep the upstairs of his house somewhat cooler.
The interpretation of the results follow.
Intake vents located at the lowest part of the roof under the eaves allow cool.
This pressure fluctuates based on the duty cycle of the fan coil.
Instead the goal is to design an attic ventilation system that effectively compensates for the additional heat gain produced by the high levels of insulation.
Or break the performance of your heating and cooling systems and your attic ventilation.