The 5500 is a good price for the 18 SEER
I have been in the business for over 40 years and work on all brands as well as dealing with people here on the site for several years. Lennox makes a good unit, but I will mention often a little higher than Rheem or Ruud just because of the name (Grand dad always had Lennox)
With that said, if you have a Rheem or Ruud dealer I would recommend getting a quote from one of them .Probably save several hundred bucks and get sme warranty and rliablity.
Then I would suggest an estimate on Carrier.They should fall in between the Rheem/Ruud and Lennox on price.
But as noted previously all are going to have excellent warranties and have earned a respected name.
I will also mention, do not be led tremendously by online reviews. I have discovered that way more people will post a negative review of a product if they have had issues than folks will with trouble free units.
If you have further questions, please let me know.
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