It took our A/c 40 min to cool 2 degrees. There's no condensation or abnormal noise. Do I need a frion boost

is this the first time that this has happened or did you just move in and its your first summer in this house? 2 things, either 1 or the both of them. 1 is you could need a freon rechargeand/or 2, your house leaks, isn't insulated good or at all and drafty doors and windows.Look at all these thigs as the reason it takes so long to cool. Once it cools to the desired temp. how long does it last before the AC kicks on again.

It took our A/c 40 min to cool 2 degrees. There's no condensation or abnormal noise. Do I need a frion boost
Michael is on the right track. Another possibility is the condensate and compressor coils are in need of cleaning. Obstructions in these can reduce air flow and efficiency. Check if your condensate coils are frosting as this is an indication that the freon is low on charge. Temperature difference between the discharge and return air should be between 12 to 15 degrees or better. In addition, a power attic ventilator will reduce heat in the attic, helping your cooling, and extend roof life.
Reply:40 min to cool 2 degrees doesnt sound that bad. I guess I would like to know what temp you keep your house at during the day. Are you home or do you go to work. Do you keep the T-stat set so that the AC can keep the house semi cool like around 76 during the day? Or do you turn it off and turn it on when you come home. If you turn it off and let the house capture heat all day then it may take a little bit to cool it. One thing you could do is take a thermometer and get a temp reading near the big grill (return air grill) that pulls the air to the furnace. Take a temp reading there and then take a temp reading at one of your discharge vents. If the temp difference is between 18-22 degrees then you'll know that the unit is cooling within its design. If you are worried about it call someone to come and take a look. To really tell if you have a problem with refrigerant a tech needs to put gauges on the system. If a unit is installed right and properly maintained it should never need a freon boost. If it does then there is a leak that has developed somewhere and it will probably get worse.
Reply:Too much freon causes poor cooling. Too little and your coil freezes up. So you need a :"just right" amount that allows the inside house coil to get down to about only 38 degrees.





To see if your unit is working, put a thermometer on discharge register, anyone will do fine, and check and see if its about 45 degrees discharge air. If higher, the system needs attention.





Another check, that large copper pipe coming off the blower area that heads outside. That pipe if you tape a themometer on it should read about 40 degrees. That gives you the coil temp inside the blower.
Reply:Lack of condensation is not necessarily a bad thing or sign of trouble. Condesation is the moisture in the air and if it is particularly dry, then there wont be much if any condensation.The long running time just to make temp to me sounds like a refrigerant leak or compressor valve problem. I've seen an internal compressor problem mimic a low charge. You will need to do a few things. Make sure your filters are clean and there are no obvious obstructions around the outside unit. Clean the outside unit with a hose and strong household spray cleaner. If you sitll have a problem, i would call in a pro. The earlier the better because as the AC season goes on, the list of people waiting gets longer.