Seals.
A window a/c unit sits inside of an open window and cools the air it draws in from the exterior. The window a/c unit must then be sealed into the window so that the only air coming through is the air it pulls and sends out through the cooling unit. If the window doesnt have seals around its edges and theres light poking through, hot air is then able to come around the sides of the unit. Cool air may be coming through the window a/c unit, but, if hot air is coming through, youre not going to have a really cool home. So make certain those seals are tight For more Info go to . If you can see light, you need brand-new seals. Also, make certain the window a/c unit is sitting in the window properly, as an odd angle can also permit air to escape into your home.
Debris.
As the window a/c unit pulls air into your home, its also pulling in dust, pollen and various other impurities. These can often congest the window a/c unit, so it will need to be cleaned every now and then to make sure youre getting nothing but cold air coming through.
Noise.
If you have utilized your window a/c unit for a while, you understand what a loud noise it makes. If it begins to make any unusual sounds or it gets even louder, thats a sign that something is wrong. Listen carefully to determine if its the fan or if something is possibly obstructing the airways.
If your window a/c unit is not functioning properly, it would be much better to get a brand-new one as opposed to having a hot home or even run the risk of igniting a fire. Of course, central air conditioning would be much better, but if window air conditioning is all you can afford, at least make certain its running efficiently.