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Place a high-velocity fan in the area you'd like to rid of mosquitos. Attach a mesh screen to the front of the fan with magnets. Switch on your fan. Turn off the fan and spray diluted rubbing alcohol onto the screen. Place a white towel on the ground and wet it with the alcohol mixture. Remove the screen and allow the mosquitos to fall onto the towel.
Purchase a high-velocity fan from a hardware store and place it in the area where you would like to catch mosquitos. While you can use a box fan, high-velocity fans are more effective because they move a larger volume of air, meaning they will potentially catch more mosquitos. You may need to use an extension cord if you would like to place your fan outside to catch mosquitos. Find a screen with mesh that is too small for a mosquito to pass through and cut it to match the size of your fan. Wrap the edges of the screen around the front of the fan tightly so that they overlap on all sides with the fan's metal frame. Place strong magnets around the frame to firmly fix the mesh in place. If your fan does not have a flat metal frame, you can also use plastic zip ties to secure the mesh to the front of the fan. Turn the fan on and watch it draw in the air. As the fan sucks in air to blow out the front, it will also draw in any nearby mosquitos, trapping them in the mesh screen. Allow the fan to run continuously until you have caught the desired number of mosquitos. Most industrial, high-velocity fans are designed to run continuously so they are safe to leave on for long periods of time. This typically will not damage the fan's motor. Mix equal parts rubbing alcohol and water then place it in a spray bottle. Spray the rubbing alcohol mixture onto the screen where the mosquitos are caught. The rubbing alcohol will kill the mosquitos. Make sure not to spray the fan's motor, which is in the center. Just aim for the parts of the screen around the motor. Spray a white towel or paper towels with the diluted alcohol so that it will become a tacky surface. Place the towel directly in front of the fan. The white color is important if you'd like to be able to tell how many mosquitos you have caught. Take off the magnets or any zip ties to remove the screen from the front of the fan. Gently tap the back of the screen with your hand so that the dead mosquitos fall onto your alcohol-soaked towel. Any mosquitos that may still be partially alive will die once they meet the alcohol on the towel. You can either dispose of the mosquitos in the trash or dump them in the yard. The rubbing alcohol will eventually evaporate so you can also consider leaving the mosquitos out for frogs or lizards to eat. Repeat the process of running the fan and cleaning the screen as many times as necessary.