Hello. My 4 ton 15 seer Trane required a new expansion valve in Dec. when it was 10 months old. Installed and serviced by a Trane dealer. Had to wait 2 days for the part from Trane. The unit does not seem to be as efficient as it was before the repair. It take 2 hours to increase the temp. 1 degree with or with out emer. heat. My electric bills have been $571 and $428 since the repair, before the max. was $340.
Is this possible? Wrong valve installed? Bad repair. Defective valve made in Mexico?
Thanks for your comments.