HVAC contractor quoted a Carrier furnace for new house under construction. When the furnace was installed I noticed it wasn't a Carrier, but was a Payne model. HVAC contractor says the Carrier furnace was on back order for a few weeks, so he installed the Payne (without my approval). Says it is the same furnace (Carrier owns Payne ?), just a different name on it. Is this true or is it a lower quality furnace ? What is the differences in quality, price, warranty ? Should I make him remove the Payne and install the Carrier unit ?