I had my a/c charged today because it has not been cooling the house down. It took less than a pound, but it still blows worm air. Fan and compressor all running. I cleaned outside unit, filters, replaced fuses in breaker outside, I even had an exhaust fan installed to help cool attic. What could it be???

Check the outdoor unit (condensing unit). Keep in mind, because the condenser fan is running it's not an indication that the compressor is working. On a split system,there's a dual capacitor that serves the fan and the compressor. The capacitor has three terminals.
1. common
2. fan = fan
3. Herm = compressor
This is a common problem; The outdoor fan (condenser fan) runs, but not the compressor (you have to know the sound of a running compressor or you'll mistake it for the sound of the fan) doesn't, because the compressor side of the capacitor is too weak to give it that needed phase angle that it requires to start. If you're referring to the outdoor fan spinning, but no cooling, I can bet the compressor isn't working and needs a new capacitor. Very common problem, I see it all the time. Before you change the capacitor, make sure that you cut the power to the unit, and then use an insulated tool such as a screwdriver and short the terminals together first. A capacitor holds a charge even after being de -energized.Buy the new one with the same exact rating written on it as the old one. Do not mix up the wires when replacing. Write it down or take a picture with your phone

First the weather is extremely hot mid 90's and humid.I have a Trane combination a/c heat pump system. The A/C was pumping out warm air.I called for a technician and the problem was the compressor was not working.The solution/fix was to replace compressor start capacitor.The technician was here for about an hour.The compressor was running before he left however I informed him the air coming out of the a/c ducts after one hour of run time did not feel as cool as usual. It took from 1pm until 10 pm at night to cool the house air down to 80 degrees and the system ran constantly.I left it on 80 as that is where I usually leave it. Today again it is running all day barely able to keep the house at 80.My home was built in 07 block house, well insulated with thermal double pane insulated windows.I suggested to the tech to check the refrigerant level but he did not think it necessary and did not perform the check while here. The unit will cool the house down to 80 degrees but runs constantly.My question is: Should I have a technician come check out the system to insure proper refrigerant levels and pressure????????

Please check your compressor whether it takes correct amphs. Due to weak in capacitor and also less rpm of fan motor the compressor gets overheated and it turns the unit off. If capacitor weak change it. If less rpm on fan motor change fan capacitor or fan motor.

Go to the outside unit and see if the compressor is running. It may be hard to hear. If you need to you can disconnect one fan lead so you can hear the compressor. If it isn't running then check the capacitor. If it is running then get the refrigerant charge checked. Also check air filter(s) and make sure the coils are clean.

It sounds like the compressor is not coming on in the outside unit. If it worked fine and was cooling before, then your compressor probably over-heated and tripped the internal overload switch which causes it to stay off while everything else is working. The most common cause of your compressor over heating is an incorrect refrigerant charge, though it could be a few other things like a restriction in the copper line set. You will be able to hear the fan motor and the compressor kick on if you listen close while the system first turns on. If the compressor is over-heated, then after it cools to a save temperature, it will come on again, but only till it over-heats again. I would have the charge checked on the system, but remember that if the compressor is over-heated when the technician gets there, there is nothing he can do until it cools down and time is money! It's best to not run it until the problem gets figured out. Hope this helps and points you in the right direction. Good luck!

check the compressor temperature if hot check refrigerant charge is less.

be aware that not repairing this asap that you are causing yourself more problems First I would change out the fan capacitor and see if this could be the problem. Secondly if the capacitor isn,t the problem change out the motor . By continuing to allow the system to cycle like this the compressor will take a dive on you costing more . Good Luck

Dave

make sure system is not over charged, no good for a honda and if it was converted to r134a the car needs to be charged atleast a 1/4 pound less than the r12 specs

Had the same problem 5 YR OLD unit and I was sweating. Took off back and side panels. Cleaned out the H2O hose and Took out lots of dirt and grim covering the unit. It seems when the unit is covered with this dirt n grime the auto cut off engages to prevent damage and/or possible fire. After a through cleaning I grabbed for the blanket that evening. Been on 12 hours now and gosh the room is cool,

Yes, the compressor might not be running. Possibly a bad run capacitor or maybe burnt wires on the contactor or compressor flags.