Approach with Caution Buyers should carefully review the detailed installation and wiring instructions in the images before making a purchase. It is advisable to proceed with caution if you do not have prior installation experience to prevent issues such as malfunction and incompatibility due to purchasing the wrong item.

Suuwer S721 non-programmable heat pump thermostat for home, up to 2 heating and 1 cooling multi-stage systems.

Compatible with Heat Pump systems (with aux or emergency heat) and Heat Pump (without aux) systems. Compatible with most 24V conventional single-stage systems (i.e. conventional force air, central gas, oil, or electric furnaces single-stage systems ) up to 2 heat 1 cool.

Not compatible with 110-240V electric heat systems (like electric baseboard heat, line voltage, convectors, radiant-ceiling heat). --- Does not work with conventional multistage systems, mini split systems and 12v rv thermostats.

Dual 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).

Easy-to see and read: display with blue backlight, large clear backlit digital display, very suitable for middle-aged and elderly people.

Technical support: Separate heat or cool swing set up (0.2°F to 2°F) and 5 minute compressor delay protection (Selectable ON or OFF). Digital thermostat has a built-in battery change and filter change reminders (Set 50-2000 hours).

Room temperature calibration adjustment, Accurate temperature control of +/-1-degree F for consistent comfort. Room temperature display range (41°F to 95°F), Temperature control range (44°F to 90°F).

2-year worry-free warranty and 24h customer servic. (Tip: before purchasing please check whether the wiring port of the old thermostat matches)