I've been comparing the Trane XL15i or XR15 and Carrier Infinity 3-4 ton heat pumps. It looks like Trane has a electronic defrost or something called that. I'm not completely sure of the advantages, and I'm concerned that the Carrier line doesn't have this feature (as far as I know).
Could someone enlighten me on this?
(Edit: Portland, Oregon, 2400 sqft, single level, wt gas furnace)