"Generally, when it is really hot outside it is a good idea to keep windows closed during the daytime, as you don't want the hot external air to come into the house warming it up," she explained. "However, after the sun goes down, the outside air will start to cool down.
“If it's cooler inside than outside, you should keep your windows closed,” he says. Although it's easy to imagine that flinging your windows wide might invite some hint of a cool and pleasant breeze, in all likelihood, you'll just be bringing warm air in – making your living space even hotter.
Sleeping with the window open could inadvertently trigger allergies, asthma or potentially cause illness in someone with an already-weakened immune system. But for most people, it's relatively risk free. Aim to keep your bedroom around 65 degrees with 65 percent humidity.
The single most effective way to avoid Carbon Dioxide build-up is to keep windows open while you sleep. This allows fresh oxygen in, as well as allowing Carbon Dioxide to escape naturally. Another important factor in choosing to keep windows open at night is for temperature control or thermoregulation.
Keeping humidity out
One of the best ways to keep humidity from entering your home in the summer is to keep the doors and windows tightly closed. You don't want to waste energy cooling the entire neighborhood, so when your AC is running you should always have all windows and doors in the house closed.
Keeping a window open reduced concentration of carbon dioxide, volatile organic compounds, and some particulate matter in participant bedrooms. People slept better. Keeping a door open also reduced carbon dioxide concentration, without a direct correlation to improving sleep.
Opening the window on a breezy warm day may make you feel like you're cooling off your house, but it's an illusion. In fact, while the breeze feels nice, you're actually letting loads of hotter air into your home.
Generally, if your house is decently insulated, keep the windows and blinds closed when the sun is shining. Open the windows in the evening and at night. More specifically, keep the windows closed when the outside temperature is hotter than it is inside, and open the windows when it's cooler outside than inside.
If the nighttime temperature is similar to or below what you have your thermostat set to, opening your windows at night is generally always a better option than running your air conditioning.
Prevailing wisdom is that at least 5 minutes—and ideally 15 to 20 minutes—a day of ventilation significantly improves indoor air quality. For a strong ventilation, open the front and back door, along with windows on the path in between, to get the baddies out.
Those days are long gone. These days, in most parts of Australia, it is illegal to leave your car unlocked, or your windows down.
As great as fresh air is, you can't just leave your windows open all the time. The air may be cleaner, but there are still pollutants to worry about. Pollen and dust can get in, as well as exhaust from passing cars and other sources.
One way to do this is by opening up the windows at the lowest and highest points in your house. This creates a "chimney" effect: Cool air enters the house through the lower windows. As it heats up, it travels upward and eventually vents out the upper windows.
Use fans to improve air flow
Even without an open window, fans can improve air flow. Point fans away from people. Pointing fans toward people can blow contaminated air directly at them. Use ceiling fans to help improve air flow in the home whether or not windows are open.
When windows are kept closed and there is insufficient air circulation inside, condensation can form on the panes. If ignored, this moisture can create serious problems. Mold, bacteria, and other toxins can start to build up and possibly cause illness in those living in the home.
35% VLT is the limit for front side windows in all Australian states and territories. A strip across the top 10% of your windscreen, that can't go below the top reach of your wipers, passes all state and territory laws except for WA which doesn't allow any tinted film to be applied to the windscreen.
The Building Code of Australia has a minimum requirement for natural light to a habitable room. It is calculated based on the floor area of a habitable room. A window opening is required that has an area 10% of the floor area of the room.
Year round, Germans open household windows and doors to exchange stale trapped air with the fresh outdoors.
Carbon monoxide can build up to deadly levels indoors without proper ventilation, but it is not the only risk. Concentrations of radon, which can cause lung cancer, can increase in homes with low ventilation.
Fresh air not only cleans your lungs, it can also boost your mood, lower your heart rate, increase energy levels and even improve digestion (yes, that's right). Florence Nightingale knew the benefits of fresh air long before any scientific study.
Opening the windows would only be allowing humid air into the room. You should also keep the windows closed when there is cold weather or if it is raining but the exception to this is if you are having a hot shower or cooking then your windows should be open.