We had a Trane XR11 air conditioning unit installed 4 years old by our HVAC guy. He previously sold us 2 furnaces as well. When one of his employees came to service it in May, we both noticed it was not cooling well. He sent someone out to inject it with refrigerant and it seemed to fix the problem. However, the problem returned last week. He came out to inspect (again) and told us we needed a new indoor evaporator coil. We were stunned because we assumed when he put in the ac and/or furnace he also put in a new evaporator coil.He did not, and he never mentioned that we needed one. Now he wants to come back, for $1000, and replace the old one so our AC will work again.
Have we been "had"?