Central Air Conditioner Randomly Stops blowing cold air
(Baton Rouge, LA)
Central ac unit Installed 4-3-2009
1.25 year old RUUD 4-ton Condensing unit (3-phase)with Air Handler (UANL-048JAZ); 410a refrigerant.
When I come home and turn the thermostat down, the air handling unit in the attic will make a buzzing noise. When it makes this noise the unit blows air, just not cool air. The low end coming off the compressor turns dry and warm.
I can turn the central air conditioner off and restart it ~15 minutes later; the air handling unit will make a high pitched sound, as it does every time it is going to work, and it blows cold air. this may not happen again for 2 months or 2 weeks or 2 days.
Several Hvac techs have tried and failed to diagnose the problem; however, I have the central air conditioning unit working by the time they arrive. Please help, I have an 8 month and a 2 year old little girls in the house in Baton Rouge, LA (HOTTEST PLACE ON EARTH).