Earlier this year I had new HVAC installed - A/C unit had a leak (amana) and furnace (Trane) was old (manufactured in 1984 per label). I moved into current house in 2015 and A/C unit was installed in 2013 if memory serves. I had many companies come out and quote from several of the big manufacturers (goodman, daikin, trane, rheem, lenox, carrier, amana, american standard).
I had a couple salesman question me getting more than 2-3 quotes. The highest quote I received was Lennox and the sales guy was super pushy and not listening and tried to pressure me to sign then and there and wouldn't leave any info (presentation on a tablet and not available online). I was about 10 seconds from telling him to get out of my house before he finally got that I had another company coming in a few hours after him.
I Was told goodman makes coils and other parts for many of brands and they are notorious for leaking, usually a year or two after warranty expires which fit in with what I expericed with my Amana unit with goodman coil.
I wound up going with Rheem unit, it wasn't the cheapest but was still about 13k less
than the mid range lennox I was quoted. One of the reasons i chose the company I did was the sales guy was also the area technican. When the install crew showed up, the warehouse gave them the wrong a/c and the wrong thermostat - both were upgrades from what I was quoted. I got a 3T variable speed 2 stage furnace and variable speed heat pump and wifi enabled thermostat.
The sales guy/tech said they used to sell goodman but noticed the leaks and stopped selling them. They do sall the daikin minisplits though. He said they do a lot of work for rentals in the north GA mountains and that is the preferred unit many owners go with due to cost and amount of time in use.
The old system, filled with refrigerant ran basically non stop on days in upper 70s and the new system was installed just before the hotest part of summer. Even when multiple days in a row of temps in the 90s and lows in upper 70s/80s it never ran constantly.
Only time will tell how lasting the new system is, but so far it's been great. The report for the thermostat shows my A/C ran 34 hours less in aug than july.
Dan