I've got a Lennox M/N HS29-060-1p AC with Serial number 5899M43648

First installer says air compressor is bad and am waiting on a replacement with a verbal install price of $1800.

Now waiting for the part to come (cant tell us for sure when it will be in) and have called a couple other Lennox retailers , one indicating that Lennox cross references a Copeland compressor. 1st Lennox says that Copeland may require a retrofit and is not of as good of a quality. Is this true? My other calls are saying $2100 and up to $2500 for install. Apparetnly the Copeland is readily available, and the Lennox compressor is "on its way." Any feedback on the Copeland vs. the Lennox?

AC went out Sunday, Omaha NE, Humid and 96-97 degrees again today. So hoteling it.