The AC in my girlfriend's house doesn't work right. It blows out cool air from the vents in the ceiling but it hardly moves any air at all. When the thermostat is on about 75 degrees the AC will cycle on and off at normal intervals but the house is still excessively warm and it takes several hours to move the thermometer down even 3 or 4 degrees. Even then it never gets past 78 degrees or so. It will run for hours nonstop if you set the thermostat at 70 or below. This is about an 1800 square foot house, and is laid out like a traditional single story home with a long hall, living room and kitchen and 3 bedrooms and 2 baths. I already removed the fan from the air handler and cleaned off the dust and dirt from the blades, and I cleaned the dust and dirt off the screen covering the condenser tubes. The air filter is new and clean and you can feel a great deal of velocity of air moving through the air handler. Just not much comes out from the vents. You can't even feel any air from the vent with your hand about 15 inches from it. She says it has been like that for a long time and it always takes a while to cool the house down. Next weekend I plan to get into the attic to see if the duct work is damaged. If anyone here has any HVAC experience, I am all ears for what else to check. It can't be normal for it to work so hard yet produce so little cool air flow. Do animals get into attics and chew up the duct tubing material? Any info is appreciated here.