Add $175.00 for FREE shipping
Shop All!
Thermostat Types
Battery Backup
LCD Display
Multi-Stage Control
24V AC
Ease of Installation
Intermediate (Installs < 60 minutes)
Other Ways to Shop
In Stock
On Sale
Order the Smarthome Catalog

Non-Programmable Thermostat Keeps your Home at a Comfortable Temperature
Robertshaw RS4220 Value Digital Non-Programmable Thermostat Universal Control up to 2 Heat / 2 Cool
Robertshaw RS4220 Value Digital Non-Programmable Thermostat Universal Control up to 2 Heat / 2 Cool
Robertshaw RS4220 Value Digital Non-Programmable Thermostat Universal Control up to 2 Heat / 2 Cool
Item# 29917
Price: Normally $83.85 
Hot Deal $44.56
Free shipping on orders over $175 - See Details


  • Operates on both multi-stage gas/electric furnaces and heat pumps for less inventory
  • Quick-connect wiring feature saves up to 15 minutes on every installation
  • Pop-up wizard customizes thermostat settings with an instant start-up menu
  • Fully adjustable differentials to maintain optimal heating and cooling comfort year-round
  • Worry-free memory retention maintains set point and programmed parameters, even during power outages
  • Compatible with all standard 24V AC heating and cooling systems

Essential Info

With the comfort, convenience, and efficiency features that homeowners and contractors want, the RS4220 thermostat provides custom program options in an economical and value-packed thermostat. Installation is fast and easy with the quick-connect wiring feature. The thermostat includes auto changeover to automatically switch between heating and cooling for constant home comfort. Keep the fan circulating to maintain optimal air circulation between demand cycles for improved comfort with minimal energy use.

Its big, bright backlight makes viewing and setting the temperature easy and even includes a nightlight option. Adjustable temperature differential and upstaging provide for a full selection of parameters to deliver maximum comfort or energy savings. High and low setpoint limits protect the heating and cooling systems by limiting temperature settings. Low temperature freeze protection automatically turns on the heat when temperatures drop below 41 degrees F to prevent pipes from freezing.



  • Weight: 12.8 oz
  • Electrical rating: 24V AC (18-30V AC), 1 Amp maximum load per terminal, 3 Amp total maximum load (all terminals combined)
  • Temperature control range: 45 to 90 degrees F (7 to 32 degrees C)
  • Accuracy: +/- 1 degree F (+/- 0.5 degrees C)
  • Power: 24V AC with battery back-up OR 3.0V DC (2 AA alkaline batteries included)
  • System configurations: Two stage gas, electric, oil, millivolt, and up to three stage heat pump systems
  • Terminations: RH/R, RC, C, G, B, O, Y1, W1, Y2, W2, E, L
  • Important notes:
    Defective exchanges for identical item within 30 days of purchase. After 30 days, please contact the manufacturer.
    Manufacturer contact information: Johnstone Supply, Tel: (503) 256-3663


    3 Ratings
    5 star: 33%  (1)
    4 star: 67%  (2)
    3 star: 0%  (0)
    2 star: 0%  (0)
    1 star: 0%  (0)
    Average Customer Rating
    (3 customer ratings)
    Share your thoughts with other customers
    MELISSA -- decatur, AL   5/5/2014
    Works great, but did not explain well in wiring diagram had to hire Tech, which was goof, cause he said unit had to be killed by power switch outside and by fuse box or would have blown up other parts. It works great and simple easy to see.
    MARK -- clermont, FL   5/28/2012
    delivery was quick and product was right
    JOHANN -- festus, MO   7/7/2011
    Good product for price. I am quite happy with the features and ease of installation.


    Steren 300-756WH White Thermostat Bulk Cable, 250 Foot Spool       
    Steren 300-756WH White Thermostat Bulk Cable, 250 Foot Spool       

    Related Items

    Sign-up for Exclusive Email offers 
    How to Order Track Your Package Shipping Returns Contact Us Customer Service Retail Store
    Getting Started Learning Center FAQ Dealers Customer Testimonials Affiliate Program
    About Us INSTEON Press Awards Employment Guarantees Security & Privacy
    Free Catalog Email Newsletter Forum RSS Site Map
    Have questions? Call us at 800-762-7846 (Mon-Fri 5am-7pm and Sat 6am-3pm PT) or send us a message
    Place your order by 3pm PT for same day shipping
    Copyright 1995-2014 SMARTHOME™
    Verisign Secure Site PayPal Acceptance Mark