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HOW TO HAVE CROSS VENTILATION IN A SINGLE WINDOW ROOM ? Cross ventilation describes the process of pulling cool air into a room through one opening while pulling hot air out of the room through another. You can usually achieve this in a room by opening multiple windows. If a room only has one window, you can still cross-ventilate in other ways. Doors Open the door in the room to create cross-ventilation with the single window, as well as other doors and windows throughout the house. This allows an airflow similar to that of two windows open in the same room. The fresh air can force stale air out of the room.

Attic and Whole House Fans Attic and whole house fans -- powerful fans built into an opening in the attic or roof -- pulls air through the open windows in a house and expel hot air out through the top of the house. Recommended in drier climates and extremely useful at night, this option creates ventilation throughout the whole house and lowers the temperature -- saving energy costs on air conditioning. Customers of Pacific Gas & Electric ( may qualify for a rebate on the purchase and installation of a whole-house fan when certain conditions are met.

Window Fans Window fans can be used in various ways to cool a room. If the outside temperature is cooler than the interior of the house, placing a fan in the window facing inward pulls cooler air into the house. Cooler air from the interior of the house can be blown into the room with a fan in the doorway, as a fan facing outward in the window pulls the room's hot air out. Window fans can be a simple box fan or a wide double-fan designed to cover the width of the window opening.

Ceiling Fans Air movement can also be achieved by use of a ceiling fan. While not considered cross-ventilation, circulating the air with a ceiling fan, especially with the door and single window open, can improve airflow and lower the perceived temperature in the room. How to Improve Air Circulation in a House Proper air circulation is crucial in any home, because airflow regulates temperature, removes impurities, prevents mold and just creates a more pleasant and safe breathing environment. By contrast, poor air circulation can actually endanger your health. When your home's air seems stagnant, or its air circulation otherwise leaves something to be desired, take steps to get breezes flowing again for a healthier, more comfortable home.

1 Open doors and windows. This is the most simple and obvious way to immediately improve the indoor air circulation. By simply opening windows in different rooms, you can create a cross flow that improves the circulation of the entire house.

2 Install exhaust fans, especially in the kitchen and bathroom. An exhaust fan works sort of like a traditional fan in reverse. Rather than blowing air outward, it draws air and moisture inward. This improves outdoor ventilation, prevents humidity from taking over your house, and removes contaminants from the air.

3 Run ceiling fans and window fans. In addition to the exhaust fans that improve your overall air, traditional fans can ensure that the air continues to circulate. Window fans are especially useful for this purpose.

4 Install an attic vent, if you do not already have one. A lack of attic ventilation can cause stagnant air to become trapped, penetrating the attic floor and affecting the entire house. This job is best left to the professionals, but you can install a gable vent in your attic by first cutting a frame according to the manufacturer's directions and then mounting the vent with the tools provided. An attic fan can also help improve circulation in the attic.

Things You Will Need Exhaust fans Fans Attic vent Tip Air conditioners and heaters can also accelerate the airflow in your home, but these options require greater energy consumption. Warning Limit your use of devices and appliances that cause emissions, such as gas stoves and heaters. These can hinder your overall air quality. How to Create Ventilation Without a Window A windowless room can serve many purposes. Often created in a previously unused space, it can become a valuable and much-needed home office, sewing room, workshop, laundry room or bathroom. Health and safety considerations mandate some type of ventilation, and many building codes have very specific requirements. Several simple strategies and innovations in ventilation equipment let unused space become a functional area in your home.

Non-Mechanical Ventilation Leaving the door off a windowless room is an obvious way to improve ventilation, but it is not always ideal. You may want to keep dust, children or pets away from fragile or valuable equipment, or you may want to keep machinery noise inside the room. Consider using passive vents to allow air to pass from one room to another. The registers and grilles used for heating and air-conditioning systems can also be installed in walls, ceilings and floors to increase air circulation. In some old houses, for example, you may find ductless registers in second-floor rooms that were intended help diffuse rising first-floor heat. If your main concern is privacy, consider installing a louvered door to enhance air circulation.

Portable Fans and Ceiling Fans A portable fan can enhance air circulation substantially, especially in a small room. However, if it's directed into the room, it may produce unwanted drafts. Placed so that it faces away from occupants and toward the open door. This may feel less cooling but will remove stale air effectively. Some ceiling fans can be operated in reverse gear, drawing hot air away from room occupants when needed, then bringing hot air down from the ceiling to warm a room during colder months.

Passive Outside Venting Many building codes require that clothes dryers be vented to the outside, rather than through a crawl space. For machines located on an inside wall, flexible vent tubing may be the easiest way to reach an outside wall. In response to the heat generated by electronic devices, especially computers, you can now find windowless air conditioners with flexible venting that can be put through a wall or a window in an adjoining room.

Mechanical Outside Venting To reduce mold, mildew and other humidity-related damage, it's best to install a vent fan through an outside wall in a windowless bathroom. Similar kitchen ventilation can be accomplished with wall fans or hooded vent fans that install directly over the stove.

Windowless Room Concerns According to the Alliance for Healthy Housing, several internationally accepted building codes set very specific ventilation requirements for inhabited rooms, such as living rooms and bedrooms. Local building codes add further restrictions in many communities. Failure to comply with regulations can affect both your safety and your ability to sell your property. Before you dedicate windowless space to a specific purpose, check local code provisions.