This is a Programmable Thermostat for 2H/2C Conventional Multi-Stage systems.

With the 5/1/1 simple programming, you have the flexibility to program your weekly temperature settings independently of your Saturday and Sunday, so it will help for your energy savings with comfort meet.

This STN615 is easy to install and works with all standard home HVAC systems.

· High Compatibility: Single-stage or Multi-stage systems, Forced air (gas, oil or electric), Electric furnace, Hot water steam or gravity radiant heat, Heat only systems, Heat pump w/o auxiliary or emergency heat, Millivolt, Gas fireplaces (24V), Floor or wall furnaces, Cool only systems.(TIP: Before purchasing, check to see if this thermostat is compatible with your system.)
· Not Compatible: Heat pump with auxiliary or emergency heat, Dual fuel/hybrid heating, Electric baseboard heat (110-240 volts), Line voltage, Convectors, Radiant-ceiling heat, Mini split systems and 12V RV systems.
· Easy to Install and Use: Large terminal blocks with universal sub-base, can be installed within 30 minutes, clear, easy-to-read backlight LCD display and easy controls make for a user-friendly experience.
· Factory Pre-set Energy-efficiency Program: 5/1/1 easy-to-understand programming menus, flexible programming lets you sync your comfort with your schedule.
· Simple but Powerful Control: Easy-access front-load battery compartment, adjustable temperature differential (swing) for energy optimization and maximum system life, Support temperature display calibration, Convert °C/°F units, compressor delay protection (selectable on or off).
·Dual Power Supply: Can be powered by 24VAC power or 2 AAA batteries, No common wire (C-wire) required on most systems (only required on heat only and cool only systems).
·Reliability: Made by professional manufacturer and backed by over 20 years of experience, the customer service is 7*24 hrs available.