Thanks ahead for any advice you can offer. In April, our fan blower motor and inside coil was bad so we ended up replacing the entire air handler. The new air handler is is a RUUD 5 ton unit RHLL series. Our outer unit is an Amana Heat Pump. RHE48a2D. Soon after the air handler was installed, we would notice periods of time where it did not seem to be cooling. This has gone on since April. Service techs have been sent out. They have checked the coolant, everything is fine, the compressor is not "overamping" (not sure what that means) One technician felt that the outside fan motor was going out, so we replaced that at $ dollars and it is still doing it. I've replaced the thermostat. Many times by the time the technician gets her it has started working again. I have determined that when I notice this occurring the air temperature out of the register is 75 degrees. When the AC is working fine, the air temp out of the register is about 68. This is based on a candy thermometer that now resides in the register in the kitchen. I saw a similar problem on Youtube regarding a Carrier brand and a hard start kit due to a TXV valve. I am an ER nurse by trade, so I could tell you the physiology of the heart, but have no idea what this stuff means. Hats off to you that do. The dealer is talking that we may just need to buy a new outdoor unit, but if I am going to spend $$ on a new outdoor unit, I want a good reason why I need to. So far, they say that the compressor is good. No one has even mentioned anythiing about an expansion valve, etc. If anyone could point me in the right direction, I would be grateful.