Evolution® Control (Best)

• Straightforward prompts for ease of use
• Perfect Humidity™
• Air quality control
• Fan speed control
• Ventilation control
• Easy-to-read LCD screen
• Day-at-a-glance 7-day programming
• Large, easy-to-push buttons
• Optional Remote Access Kit
• TrueSense™ dirty filter detection
• Optional Zoning System - up to 8 Zones
• 10-year parts limited warranty upon registration (SYSTXBBUIZ...01-B)
• 10-year parts limited warranty upon registration (SYSTXBBUID...01-B)
• 10-year parts limited warranty upon registration (SYSTXBBSMS...01)
• 10-year parts limited warranty upon registration (SYSTXBBSAM...01)
• 10-year parts limited warranty upon registration (SYSTXBB4ZC...0)
• 10-year parts limited warranty upon registration (1SYSTXBBNI...M01)
• Maintenance reminders
• Online Tutorial

Preferred Deluxe Programmable Thermostat (Better)

• 7-day programming with 4 periods per day
• Auto changeover
• All-electronic operation
• Battery-free backup stores programmed information
• Copy previous day feature
• "Hold" function
• Service reminders
• Energy Star
• 1-button vacation mode
• Large push buttons
• LCD screen
• Mercury-free
• 5-year limited parts warranty

Preferred Premium Programmable Thermostat (Good)

• 7-day programmability with 4 periods per day
• Service reminders
• Auto changeover
• Copy previous day feature
• "Hold" function
• 1-button vacation mode
• Energy Star
• Large push buttons
• Backlit LCD screen
• Battery-free operation
• Mercury-free
• Simple instructions posted inside door
• 5-year limited parts warranty