Direct answer
A compatible smart thermostat can reduce wasted heating and cooling, but savings are not guaranteed. ENERGY STAR reports an average benchmark of roughly 8% of heating-and-cooling bills, or about $50 annually, across certified products and field data; climate, utility rates, occupancy, schedules, equipment, and previous habits create wide variation. See ENERGY STAR's smart-thermostat FAQ.
Phoenix homes often have substantial cooling demand, so scheduling, occupancy logic, shade coordination, and alerts can help. Setback and recovery behavior is system-dependent and can interact with variable-capacity equipment, so follow the HVAC manufacturer's required thermostat and commissioning guidance. A thermostat cannot correct undersized equipment, duct leakage, weak insulation, or air leakage. Verify compatibility, set realistic limits, and compare weather-normalized utility use rather than promising a universal percentage. DOE's smart-thermostat benchmarking research explains why equipment and control strategy matter.
Sources and technical references
Use the organizations responsible for a product, platform or standard to confirm current specifications and compatibility.
How this answer was prepared
Camelback Smart Homes publishes this FAQ library for homeowners, design professionals, builders and property teams comparing integrated technology. Answers begin with the practical conclusion, then explain the factors that can change it.
Limitations: This is general educational information, not a site-specific design, quote, code determination or compatibility guarantee. Final requirements depend on the property, construction, infrastructure, equipment versions and project goals.