Carrier Infinity Why Would I Only Have One ZONE Heating And AC? Carrier INFINITY Heat Pump System Was Installed.?

Why would I only have one ZONE heating and AC? Carrier INFINITY Heat pump system was installed.? - carrier infinity

THIS IS A NEW HOUSE 3500 square feet and two floors. NOT an open fireplace. They use models 25HNA9 Infinty outside, inside there is an FE5 and FE4 comfort for a NON-PROGRAMMABLE THERMOSTAT MODEL TSTATCCN2S01-CC TSTATCCNAC01, TSTATCCNHP01-C. THE HOUSE is located in northeastern PA. PLEASE TELL ME WHAT YOU THINK!