Types of Old Honeywell Thermostats
The old Honeywell thermostat has been a cornerstone in temperature regulation for heating and cooling systems in residential and commercial buildings. These devices provide either manual or automatic control based on user preferences and come in various models with unique features.
RTH9585WF Wi-Fi Smart Color
This premium model features a customizable color touchscreen display and Wi-Fi connectivity for remote access via smartphones or tablets.
Key features: Seven-day programming, energy-saving settings, filter change alerts, extreme temperature notifications
RTH8560WF Wi-Fi Smart
Another Wi-Fi enabled model with color touchscreen offering intuitive remote control capabilities through a mobile app.
Key features: 5-2 day programmable schedule, smart response technology, wide HVAC system compatibility
RTH8500D Touchscreen Programmable
A versatile programmable thermostat with a large touchscreen display that doesn't require Wi-Fi connectivity.
Key features: Weekday/weekend programming, filter replacement reminder, backlit display, broad HVAC compatibility
RTH2300B 3-Day Programmable
A basic mechanical thermostat offering simple programming with a 3-day schedule option and essential temperature controls.
Key features: Easy installation, straightforward operation, budget-friendly option, reliable performance
RTH221B Non-Programmable
The most straightforward design featuring manual controls without programming capabilities for users who prefer simplicity.
Key features: Simple design, manual temperature adjustments, affordability, reliability for basic temperature control
| Model | Type | Display | Connectivity | Programming |
|---|---|---|---|---|
| RTH9585WF | Smart | Color Touchscreen | Wi-Fi | 7-day |
| RTH8560WF | Smart | Color Touchscreen | Wi-Fi | 5-2 day |
| RTH8500D | Programmable | Touchscreen | None | Weekday/Weekend |
| RTH2300B | Programmable | Digital | None | 3-day |
| RTH221B | Non-Programmable | Mechanical | None | None |
Specifications and Maintenance of Old Honeywell Thermostats
Understanding the technical specifications and proper maintenance procedures for old Honeywell thermostats will help ensure optimal performance and extend their service life.
General Specifications
Voltage
24V-240V
Varies by model and HVAC system requirements
Current
2-5A
Controls electrical power to heating/cooling systems
Wattage
3-10W
Power consumption for thermostat operation
Temperature Precision
±1-2°F
Accuracy of temperature control
Display Options
Many old Honeywell models feature LCD screens showing current temperature, settings, and system status. Displays may be backlit or non-backlit depending on the model.
Size Dimensions
Physical dimensions vary by model, typically ranging from 3-5 inches in diameter, with newer touchscreen models usually larger than mechanical versions.
Temperature Sensors
Some models include built-in or external temperature sensors that monitor ambient conditions and adjust system settings accordingly for optimal comfort.
Maintenance Guidelines
Expert Advice: Regular maintenance not only extends the lifespan of your old Honeywell thermostat but also ensures accurate temperature control and energy efficiency. Most maintenance tasks can be performed without professional assistance.
| Maintenance Task | Frequency | Procedure | Importance |
|---|---|---|---|
| Regular Cleaning | Monthly | Use a soft brush or cloth to remove dust and debris. Avoid abrasive cleaners that could damage the thermostat. | High |
| Battery Check | Every 3 months | For battery-powered models, check power levels and replace batteries before they completely drain to prevent leakage. | Critical |
| Calibration | Annually | Follow manufacturer guidelines to recalibrate temperature settings and ensure accurate readings. | Medium |
| Wiring Inspection | Bi-annually | Check for loose connections or damaged wires. Address any issues immediately to prevent malfunction. | High |
| Professional Service | Every 1-2 years | Schedule professional inspection and maintenance to ensure optimal performance. | Medium |
Important Safety Note: Always turn off power to the heating and cooling system at the circuit breaker before performing any maintenance that requires removing the thermostat cover or handling wiring.
How to Choose an Old Honeywell Thermostat
Selecting the right old Honeywell thermostat requires careful consideration of several factors to ensure compatibility with your HVAC system and meet your specific needs.
Thermostat Type
Consider whether you need a programmable, non-programmable, or smart thermostat based on your lifestyle and comfort preferences. Programmable units allow scheduled temperature changes, while smart thermostats offer remote access and advanced energy management.
System Compatibility
Ensure the thermostat is compatible with your heating and cooling system. Honeywell thermostats work with various systems including central heating, radiant heating, underfloor heating, and boiler systems.
Voltage Requirements
Verify your system's voltage needs. Most residential systems use low-voltage (24V) thermostats, while some heating systems require line voltage thermostats (120V or 240V).
Features & Functions
Consider which features matter most: energy-saving modes, temperature accuracy, display size and clarity, programmability options, and integration with other smart home systems.
New vs. Used Thermostats
When considering old Honeywell models, you may choose between new old stock or used units:
- New Old Stock: Unused older models that offer reliability with original packaging and warranty
- Used Thermostats: More affordable but may require additional maintenance and have a shorter remaining lifespan
Display & Control Options
Different control interfaces suit different user preferences:
- Touchscreen: Intuitive, modern interface with clear visual feedback
- Button Controls: Reliable mechanical operation that some users find more straightforward
- Mobile App: Remote access and advanced scheduling (for Wi-Fi models only)
| User Need | Recommended Model Type | Key Considerations |
|---|---|---|
| Basic temperature control | RTH221B Non-Programmable | Simplicity, reliability, affordability |
| Daily temperature scheduling | RTH2300B or RTH8500D | Programming flexibility, ease of use |
| Remote access and control | RTH9585WF or RTH8560WF | Wi-Fi connectivity, app compatibility |
| Energy efficiency focus | RTH9585WF or RTH8560WF | Energy usage reports, smart scheduling |
| Multi-zone system control | Check compatibility for specific models | Zone control capabilities, system integration |
Selection Tip: When choosing a thermostat, consider not just your current needs but also future requirements. It may be worth investing in a model with more features than immediately necessary to accommodate system upgrades or changing preferences.
How to DIY and Replace an Old Honeywell Thermostat
Replacing an old Honeywell thermostat can be a straightforward DIY project that improves your heating and cooling system's efficiency and functionality. Follow these steps for a successful installation.
Safety Warning: Always turn off power to your heating and cooling system at the circuit breaker before beginning any thermostat replacement to prevent electrical shock or system damage.
Required Tools and Materials
Essential Tools
- Screwdriver (Phillips and flathead)
- Drill and drill bits (if needed)
- Level
- Pencil for marking
- Wire stripper (if needed)
Materials
- New Honeywell thermostat
- Mounting screws (typically included)
- Wire labels (optional but recommended)
- Wall anchors (if needed)
- Batteries (if required by model)
Step-by-Step Installation Process
Power Off Your System
Turn off power to your heating and cooling system at the circuit breaker box. This is a critical safety step to prevent electrical shock during installation.
Remove the Old Thermostat
Carefully remove the existing thermostat from the wall. First, remove the cover or faceplate, then unscrew the mounting plate. Before disconnecting any wires, take a photo or note the wire connections - this will be invaluable during reinstallation.
Label the Wires
If the wires aren't already labeled, mark each one according to the terminal it was connected to (e.g., R, W, Y, G). Most Honeywell thermostats follow standard wiring color codes, but it's always best to verify.
Prepare the Wall Surface
Clean the wall area where the new thermostat will be installed. If you need to drill new holes for the mounting plate, use a level to ensure the thermostat will be straight. Mark the hole locations with a pencil.
Mount the New Baseplate
Attach the mounting plate of the new Honeywell thermostat to the wall using the provided screws. Ensure it's level and securely fastened.
Connect the Wires
Connect each labeled wire to the corresponding terminal on the new thermostat. Make sure each wire is securely fastened and that no copper is exposed beyond the terminal connection point.
Attach the Thermostat
Carefully snap the new thermostat onto the mounted baseplate. Ensure it's properly seated and secure.
Restore Power and Test
Turn the power back on at the circuit breaker. Set your new thermostat to the desired settings and run tests for both heating and cooling functions to verify proper operation.
Installation Tip: If your new thermostat requires batteries, install fresh ones during setup even if it comes with batteries included. This ensures you start with maximum battery life and reduces the risk of power-related issues during initial programming.
Troubleshooting Common Installation Issues
| Problem | Possible Cause | Solution |
|---|---|---|
| Thermostat won't power on | Wiring issue or power not restored | Check wiring connections and verify power is on at the circuit breaker |
| Heating/cooling system won't activate | Incorrect wiring connections | Verify wires are connected to the correct terminals as shown in your photo/notes |
| Inaccurate temperature readings | Poor thermostat location or calibration issues | Ensure thermostat is away from drafts, sunlight, and appliances; calibrate if needed |
| Display shows error codes | System compatibility or wiring issue | Consult the user manual for specific error code meanings and recommended solutions |
Frequently Asked Questions
Q1: Can I replace a thermostat without professional help?
Yes, most Honeywell thermostat replacements can be completed as a DIY project. Honeywell provides detailed installation instructions in their user manuals, and many online resources offer step-by-step guidance. However, if your system has complex wiring, multiple zones, or if you're uncomfortable working with electrical components, consulting a professional is recommended.
Q2: What should I do if my new thermostat isn't controlling the HVAC system properly?
First, ensure the thermostat is correctly installed and level on the wall. Check that all wire connections are secure and properly placed in the appropriate terminals. Verify your system configuration settings match your actual HVAC equipment. If problems persist, consult the troubleshooting section in your user manual or contact Honeywell customer support for assistance with your specific model.
Q3: Are old Honeywell thermostats compatible with all HVAC systems?
While Honeywell thermostats are designed to work with a wide range of HVAC systems, compatibility varies by model. Most conventional systems (including central heating, cooling, heat pumps, and systems with humidifiers or dehumidifiers) are supported by many Honeywell models. However, specialized systems or newer high-efficiency equipment may require specific thermostat models. Always check the compatibility information provided in the product documentation before installation.
Q4: Can old batteries leak and damage the thermostat?
Yes, old or depleted batteries can leak corrosive materials that may damage the internal components of a thermostat. To prevent this, replace batteries promptly when the low battery indicator appears, typically every 6-12 months depending on usage. Always remove batteries if the thermostat will be unused for extended periods. If battery leakage does occur, carefully clean the battery compartment with a dry cloth and contact Honeywell support if the thermostat has been damaged.
Q5: What's the proper way to dispose of an old thermostat?
Many older thermostats, particularly those manufactured before 2006, contain mercury switches that require special disposal. Never throw these in regular trash. Honeywell and many municipalities offer thermostat recycling programs. Contact your local waste management authority for specific disposal guidelines in your area. For mercury-free thermostats, electronic waste recycling centers are often the best option. When in doubt, treat all old thermostats as electronic waste requiring proper recycling.
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