We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
White rectangular wall thermostat with backlit LCD display and push-button controls

Riseem STN621White 24V HVAC Control 2 Heat/1 Cool White

SKU CH-PT1Y-XTAV1 MPN STN621White

Non-programmable thermostat controls 24V heat pump or single-stage systems with 2 heat/1 cool stages, installs in 30 minutes and runs on 24VAC or two AAA batteries

  • Rated voltage24 V AC
  • Mounting styleWall Mount
  • Relay contactDigital, 24 V AC
  • Product typeThermostat,Two Screws and anchors,Installation manual and Op
  • Size or dimensions0.98 in × 3.86 in × 4.72 in
  • Product colorWhite
  • Non-programmable simplicity for straightforward home climate control
  • Dual 24 VAC or battery power removes C-wire requirement on most systems
  • Large terminal blocks and universal sub-base enable DIY install within 30 minutes
  • Backlit LCD and push-button interface give clear readouts and easy adjustments
  • Compatible with heat-pump multi-stage and conventional single-stage forced-air systems

24V non-programmable thermostat

The Riseem STN621White is a 24 VAC wall-mount thermostat with a white backlit LCD and push-button controls. It operates on 24 VAC power or two AAA batteries and does not require a C-wire on most systems. The package includes the thermostat, two screws and anchors, cable labels, and both installation and operating manuals.

Heat pump and single-stage conventional systems

Suitable for heat pump systems with up to two heating stages and one cooling stage, or conventional single-stage heating and cooling. It also supports forced-air, electric furnace, hot-water, steam, gravity, millivolt, gas fireplace, floor furnace, wall furnace, and cool-only systems. Not for two-transformer, multi-stage conventional, dual-fuel, electric baseboard, line-voltage, convector, radiant-ceiling, mini-split, or 12 V RV systems.

No C-wire required on most systems

Dual power supply allows operation from 24 VAC or two AAA batteries, eliminating the need for a common wire except on heat-only or cool-only configurations. Large universal terminal blocks and a front-load battery compartment enable installation within 30 minutes.

How it compares

Measured against everything we stock in Heating & Cooling Controllers, at today’s prices. Recalculated every night.

Price $37.99
Cheaper than about 56% of the 1,762 comparable items (median $45.99).

Specifications

Product
Brand nameRiseem
Model nameSTN621White
Product typeThermostat,Two Screws and anchors,Installation manual and Operating manual,Cable label, 24 V Heat Pump Thermostat, Push Button
Product colorWhite
Power
Rated voltage24 V AC
Size & build
Size or dimensions0.98 in × 3.86 in × 4.72 in
Mounting styleWall Mount
More details
Relay contactDigital, 24 V AC

Questions about this item

Will this thermostat replace my older 24V heat-pump unit without rewiring?

It supports 24VAC heat-pump systems with 2 heat/1 cool or 1 heat/1 cool staging and uses a universal sub-base with large terminal blocks for direct wire transfer.

How do I confirm the thermostat is operating correctly after mounting?

The white backlight LCD shows the current temperature and active mode; adjust the setpoint and verify the system starts heating or cooling within the adjustable swing range.

Which mounting hardware and documentation come in the package?

The box includes the thermostat, two screws and anchors, an installation manual, an operating manual and cable labels for wire identification.

More in Heating & Cooling Controllers

Similar items