I have decided to upgrade my old Rheem system. Both installers have quoted me on Trane systems and one of them seems to be the most complete in determining what system I need. Both have suggested upgrading from my current 3.5 ton setup to a 4 ton. I also am going to add 8 returns in the home and eliminate the return at the current air handler location. I'm also relocating the airhandler from inside the home to the garage.

The XL19i is only $800 more than the XL16i. Is there any reason not to go for the XL19i? Considering how expensive the overall systems are in the 1st place, the $800 differential between the two is not significant to me.

I live in Orlando and run the A/C almost year round.