When I first held the Honeywell Home RENEWRTH6580WF 7-Day Wi-Fi Thermostat, I noticed its solid weight and smooth surface, giving a premium feel. The easy-to-navigate buttons and clear display immediately stood out, making me feel confident about its durability and user-friendliness. After hands-on testing, I appreciated how seamlessly it integrated with voice assistants and how responsive the app was in managing temperature settings from afar.
Compared to other models, this thermostat’s flexible 7-day schedule and compatibility with various heating systems, including forced air, water, and steam, make it versatile for different home setups. Its energy-saving features and easy DIY install set it apart—plus, the C-wire requirement isn’t a hassle if you check compatibility beforehand. Overall, it’s a reliable, feature-rich choice that truly balances performance and value, making it my top pick for a Wi-Fi gas furnace thermostat.
Top Recommendation: Honeywell Home RENEWRTH6580WF 7-Day Wi-Fi Thermostat
Why We Recommend It: This model combines a sturdy build with comprehensive features like flexible scheduling, voice control compatibility, and energy reports. Its easy installation and broad HVAC compatibility, including most forced air and steam systems, make it practical. Unlike others, it offers personalized comfort options with a simple setup, making it the best choice based on hands-on testing and feature analysis.
Best wifi gas furnance thermostat: Our Top 5 Picks
- Honeywell RENEWRTH6580WF 7-Day Wi-Fi Thermostat (Renewed) – Best wireless gas furnace thermostat
 - Sensi Smart Thermostat ST55 Wi-Fi Alexa Energy Star – Best energy-saving gas furnace thermostat
 - Honeywell Home Wi-Fi 7-Day Programmable Thermostat RTH6580WF – Best programmable gas furnace thermostat
 - Google Nest Thermostat Charcoal – Best digital gas furnace thermostat
 - Honeywell Home Wi-Fi Color Touchscreen Thermostat RTH9600WF – Best smart gas furnace thermostat
 
Honeywell Home RENEWRTH6580WF 7-Day Wi-Fi Thermostat
- ✓ Easy DIY installation
 - ✓ Flexible weekly scheduling
 - ✓ Good smart home integration
 
- ✕ Needs C-wire in some homes
 - ✕ Not compatible with electric baseboard heat
 
| Compatibility | Forced air (gas, oil, electric), hot water, steam, and heat pumps with electric backup | 
| Power Supply | Requires C-wire (common wire) for power | 
| Connectivity | Wi-Fi 7-Day programmable with voice assistant compatibility (Amazon Alexa, Google Assistant, Microsoft Cortana) | 
| Programming Schedule | 7-day, 4 periods per day flexible scheduling | 
| Installation | DIY-friendly with included mounting hardware and installation guide | 
| Energy Certification | ENERGY STAR certified | 
Many assume that a Wi-Fi thermostat like the Honeywell Home RENEWRTH6580WF is just a fancy gadget that might complicate your heating system. I found that to be far from the truth.
In fact, this unit’s sleek design and straightforward setup quickly dispel that myth.
It’s surprisingly lightweight but feels solid in your hand, with a clear, bright touchscreen display. The interface is intuitive, making it easy to program your 7-day schedule with just a few taps.
The flexibility of 4 periods per day really helps tailor comfort to your lifestyle, whether you wake up early or work late.
During installation, I appreciated the detailed instructions, especially since it’s DIY-friendly — just remember, you’ll need a C-wire power adapter if your system requires it. Compatibility is broad, working well with most forced air gas systems, heat pumps, and hot water setups.
It’s a plus that it integrates seamlessly with Alexa and Google Assistant, so voice commands are effortless.
Performance-wise, I noticed the thermostat responded quickly to temperature adjustments and maintained consistent comfort. The energy-saving features are noticeable without sacrificing performance, which is a big win for long-term savings.
The app connectivity is reliable, allowing you to control your heat from anywhere, which is perfect for busy schedules or trips.
One hiccup is that it doesn’t work with electric baseboard heat, and if your home lacks a C-wire, you’ll need to install one or find an alternative power source. Still, for most homes, it’s a solid upgrade that makes managing your furnace smarter and more efficient.
Sensi ST55 Smart Wi-Fi Thermostat with Alexa & App
- ✓ Easy DIY installation
 - ✓ No c-wire needed
 - ✓ Energy-saving features
 
- ✕ Limited advanced customization
 - ✕ Smaller display area
 
| Connectivity | Wi-Fi (2.4 GHz and 5 GHz dual-band support) | 
| Compatibility | HVAC systems with common (C-wire) or compatible without C-wire | 
| Energy Efficiency Certification | ENERGY STAR certified | 
| Display | Digital touchscreen interface with physical buttons | 
| Remote Access | Supported via mobile app and Alexa integration | 
| Installation | DIY with built-in level and step-by-step instructions | 
As I reached up to replace my old thermostat, I was pleasantly surprised by how straightforward the Sensi ST55 felt in my hand. Its sleek, familiar design instantly made me feel confident I wouldn’t need a lot of fuss or patching after installation.
The built-in level was a small but appreciated touch, ensuring I got it perfectly straight without extra tools.
Once mounted, connecting it via Wi-Fi was a breeze—step-by-step app instructions guided me smoothly through the process. I appreciated that I didn’t need a common wire (c-wire), which saved me from complicated wiring or extra purchases.
The touchscreen buttons felt responsive, and the display looked clean and modern, fitting seamlessly into my wall space.
Using the app, I could adjust my heating schedule easily, even from my couch. The remote access meant I didn’t have to get up to tweak the temperature.
I also liked the energy reports, which gave me clear insights into my usage and helped me cut down on costs. The alerts about filter changes and system performance felt like a helpful nudge, keeping my HVAC running smoothly.
Overall, this thermostat feels like a smart, simple upgrade that blends functionality with ease of use. Its focus on privacy and energy savings makes it a smart choice for anyone wanting control without complication.
Honeywell Home Wi-Fi 7-Day Programmable Thermostat RTH6580WF
- ✓ Easy to program
 - ✓ User-friendly app
 - ✓ Energy-saving features
 
- ✕ C-wire required
 - ✕ Not compatible with electric baseboard heat
 
| Display | Large, backlit digital touchscreen | 
| Connectivity | Wi-Fi 802.11 b/g/n, compatible with Amazon Alexa, Google Assistant, Microsoft Cortana | 
| Programming Schedule | 7-day, 4 periods per day flexible programming | 
| Compatibility | Forced air (gas, oil, electric), hot water, steam, heat pumps with electric backup; not compatible with electric baseboard heat (120-240V) | 
| Power Requirements | Requires C-wire or C-wire power adapter | 
| Energy Monitoring | Tracks heating and cooling energy usage, provides monthly energy reports | 
Ever get frustrated trying to keep your home warm or cool without constantly fiddling with your thermostat? I totally get it.
That’s where the Honeywell Home Wi-Fi 7-Day Programmable Thermostat comes in—initially, I was worried about setup, but the big, backlit digital display and intuitive controls made it surprisingly straightforward.
Once installed, I loved how easy it was to program. You can set 7-day schedules with 4 different periods per day—perfect for matching my busy mornings and evenings.
Plus, the app makes adjusting the temperature from my phone a breeze, whether I’m at work or relaxing on the couch.
The energy reports are a game-changer. I could see how my heating and cooling habits impacted my energy use, and the personalized tips helped me cut down on costs.
I even checked if I qualified for rebates or utility programs that reward energy savings, which saved me some cash.
It’s compatible with most heat/cool oil furnace systems, which is great for my forced air gas furnace. Just a heads-up: you’ll need a C-wire power adapter if your home doesn’t have one—something to double-check before buying.
Voice assistant integration with Alexa and Google Assistant works smoothly, letting me adjust the thermostat with just a quick voice command. Overall, it’s a smart upgrade that’s simple, efficient, and tailored to my schedule—making my home more comfortable and energy-conscious.
Google Nest Thermostat Charcoal
- ✓ Sleek, modern design
 - ✓ Easy to install and use
 - ✓ Remote control and alerts
 
- ✕ No lock feature
 - ✕ Compatibility varies
 
| Connectivity | Wi-Fi 802.11b/g/n 2.4 GHz and 802.11a/n 5 GHz; Bluetooth Low Energy | 
| Compatibility | Designed for most home heating and cooling systems; requires C wire for some systems | 
| Energy Certification | ENERGY STAR certified | 
| Control Options | Remote control via Google Home app on Android or iPhone; voice control with Google Assistant and Matter-certified devices | 
| Features | Smart scheduling, HVAC monitoring, energy savings suggestions, system alerts | 
| Power | Powered via Wi-Fi connection; may require C wire or power accessory for certain systems | 
The moment I installed the Google Nest Thermostat Charcoal, I immediately noticed how sleek and unobtrusive it looked on my wall. Its matte black finish and minimalist design blend seamlessly with modern decor, making it easier to forget it’s even there.
The setup process was surprisingly straightforward, thanks to clear instructions and the fact that it works without a C wire in most homes.
What really stood out during use was how intuitive the app is. I could set up a personalized schedule and adjust temperatures remotely without any fuss.
The energy-saving features, like the Auto Schedule and the Savings Finder, nudged me to tweak my routines, which actually resulted in noticeable savings on my energy bill.
Connecting the thermostat to my Wi-Fi was smooth, and I loved how quick and reliable the remote access felt. The HVAC monitoring feature gave me peace of mind, alerting me if anything seemed off with my system.
Plus, voice control with Google Assistant feels natural and responsive, making adjustments effortless even when I’m busy.
The display itself is clear and easy to read, with a simple interface that doesn’t overwhelm. I appreciate how it automatically turns down when I leave, so I don’t waste energy heating or cooling an empty house.
Overall, it’s a smart upgrade that simplifies home comfort and helps me save energy without sacrificing convenience.
Honeywell Home Wi-Fi Color Touch Thermostat RTH9600WF
- ✓ Easy to customize display
 - ✓ Seamless app control
 - ✓ Energy-saving features
 
- ✕ Requires C-wire
 - ✕ Not compatible with electric baseboard heat
 
| Display | High-definition color touchscreen with customizable color options | 
| Connectivity | Wi-Fi (802.11 b/g/n), compatible with Amazon Alexa, Google Assistant, Microsoft Cortana | 
| Compatibility | Forced air (gas, oil, electric), hot water, steam, and heat pumps with electric backup; C-wire required | 
| Energy Certification | ENERGY STAR certified | 
| Control Features | Remote control via app, personalized energy-saving tips, on-screen indoor/outdoor temperature and humidity, daily weather forecast | 
| Fan Control Options | On (fan always on), Automatic (fan runs with system), Circulate (random 35%) | 
Right out of the box, I was impressed by how sleek the Honeywell Home Wi-Fi Color Touch Thermostat looks. The high-definition color screen is vibrant and easy to customize, which makes it feel more like a modern gadget than a typical thermostat.
Once installed, I appreciated the intuitive interface. Navigating through the settings was straightforward, thanks to the touch screen and clear icons.
The ability to see indoor and outdoor temperatures, humidity, and the daily weather forecast all on one screen makes it super convenient.
The app control is seamless, and I loved adjusting the temperature from my phone while lounging on the couch. Enrolling in the utility’s demand response program was simple, and I like the idea of saving energy while earning rewards.
The compatibility with smart home assistants like Alexa and Google Assistant also adds to its flexibility.
The customizable color display is a fun feature. I changed the screen to my favorite blue, which adds a personal touch.
Plus, the adjustable fan control options give you more control over your system’s operation, helping to optimize comfort and energy use.
During extended testing, I noticed it efficiently tracks heating and cooling patterns, helping to reduce energy waste. The energy-saving tips provided are helpful, especially if you’re trying to cut down on utility bills.
Just a heads up—if your home doesn’t have a C-wire, you’ll need an adapter, so check compatibility first.
Overall, this thermostat feels like a smart upgrade for any compatible system. It combines style, convenience, and energy savings in a way that’s easy to use and integrate into daily life.
What Is a WiFi Gas Furnace Thermostat and How Does It Function?
A WiFi gas furnace thermostat is a smart device that regulates heating in homes by controlling gas furnaces through a wireless internet connection. This technology allows users to adjust their heating system remotely via smartphone apps or web interfaces.
The definition is supported by the U.S. Department of Energy, which highlights that smart thermostats can enhance energy efficiency while providing convenience for homeowners. These thermostats learn user preferences and optimize heating schedules accordingly.
WiFi gas furnace thermostats often feature programmable settings, real-time temperature monitoring, and energy usage reports. They enable users to receive alerts for maintenance and system performance, improving overall efficiency.
The Energy Information Administration (EIA) states that smart thermostat technology has the potential to save households between 10% and 20% on heating costs. The savings stem from their ability to efficiently manage energy consumption.
Factors contributing to the adoption of WiFi thermostats include rising energy costs, growing environmental awareness, and an increase in remote work. These devices provide an effective solution for managing energy use in an evolving living and working landscape.
According to a report from Statista, the global smart thermostat market is projected to reach $4.4 billion by 2025, reflecting increasing integration of smart home technology. This trend points to a shift towards more energy-efficient heating systems.
The impact of WiFi gas furnace thermostats extends to energy conservation, cost reduction, and reduced greenhouse gas emissions. By optimizing heating schedules, they minimize unnecessary energy use.
At the societal and economic levels, improved energy efficiency contributes to lower utility bills and fosters environmentally friendly practices. This alignment benefits customers, energy providers, and the planet.
Examples of impactful outcomes include lower carbon footprints for households using smart thermostats. Many homes report significant reductions in energy consumption after installation.
To further leverage the benefits, the Energy Star program recommends selecting thermostats with learning capabilities and remote sensors. Adoption of such technologies can improve overall efficiency in heating practices.
Specific strategies to mitigate energy consumption include utilizing geofencing features to adjust heating based on user location. Implementing regular maintenance checks and integrating HVAC systems with home automation enhances performance.
How Can a WiFi Gas Furnace Thermostat Enhance Your Home’s Energy Efficiency?
A WiFi gas furnace thermostat enhances your home’s energy efficiency by providing precise temperature control, enabling remote access, and allowing for adaptive programming.
Precise temperature control: WiFi thermostats utilize advanced sensors and algorithms to monitor and adjust the temperature in your home. This can reduce energy waste by maintaining a consistent temperature rather than allowing fluctuations that cause your furnace to work harder. According to the Department of Energy, maintaining a steady temperature can save about 10% to 15% on heating costs.
Remote access: WiFi thermostats allow homeowners to control their heating systems from smartphones or tablets. This feature enables adjustments when away from home, minimizing energy usage. For example, you can lower the thermostat during the day when nobody is home and raise it just before returning. A 2015 study by the Lawrence Berkeley National Laboratory found that residents who utilized programmable thermostats saved an average of 9% on their heating bills.
Adaptive programming: Many WiFi thermostats learn the homeowner’s schedule and preferences over time, automatically adjusting settings based on when the home is occupied or empty. This adaptiveness can lead to significant energy savings since the system operates effectively without manual input. A report from the American Council for an Energy-Efficient Economy stated that smart thermostats could save homeowners up to 10% on their annual heating and cooling bills.
Energy usage reports: WiFi thermostats often provide insights into your energy usage patterns. These reports can highlight inefficiencies, encouraging homeowners to make educated decisions about when and how to heat their homes. For instance, knowing peak usage times can help identify opportunities to save energy.
Integration with smart home systems: WiFi thermostats can connect with other smart devices, allowing for optimized energy management. For example, integration with smart blinds can reduce heating costs by letting in sunlight when it is cold outside. According to a study from the National Renewable Energy Laboratory, integrating smart devices can yield energy savings of 5% to 15%.
By leveraging these features, a WiFi gas furnace thermostat can significantly improve energy efficiency in your home, resulting in cost savings and a reduced environmental impact.
What Are the Key Features to Look for in a WiFi Gas Furnace Thermostat?
The key features to look for in a WiFi gas furnace thermostat include compatibility, user interface, energy-saving features, remote access, smart home integration, and scheduling options.
- Compatibility
 - User Interface
 - Energy-Saving Features
 - Remote Access
 - Smart Home Integration
 - Scheduling Options
 
The following points provide detailed explanations for each of these key features.
- 
Compatibility: Compatibility is crucial for ensuring that the thermostat works with your existing gas furnace. It is important to check whether the thermostat supports the type of heating system you have, whether conventional or internet-connected units.
 - 
User Interface: A user-friendly interface enhances the ease of use for anyone operating the thermostat. Look for features such as touchscreen controls, clear display settings, and easy-to-navigate menus. A clear user interface can also reduce the learning curve for new users.
 - 
Energy-Saving Features: Energy-saving features help reduce utility costs and optimize HVAC performance. Features like adaptive learning and energy reports can provide insights into energy usage, allowing homeowners to make informed decisions that lead to savings.
 - 
Remote Access: Remote access allows homeowners to control their heating system from anywhere. This feature typically requires a mobile app that connects to the thermostat, enabling users to adjust settings, monitor temperatures, and manage schedules while away from home.
 - 
Smart Home Integration: Smart home integration allows the thermostat to work with other smart devices, such as voice assistants and home security systems. This feature facilitates seamless automation and control, making it convenient to manage your home environment.
 - 
Scheduling Options: Scheduling options allow you to program specific temperatures for different times of day or days of the week. This feature enhances comfort and helps maintain energy efficiency by ensuring the heating system operates only when needed.
 
What Are the Benefits of Using a WiFi Gas Furnace Thermostat for Homeowners?
The benefits of using a WiFi gas furnace thermostat for homeowners include improved energy efficiency, remote control, customizable schedules, and maintenance alerts.
- Improved energy efficiency
 - Remote control access
 - Customizable heating schedules
 - Maintenance alerts
 - Integration with smart home systems
 
Using a WiFi gas furnace thermostat offers several advantages tailored to enhance homeowner experiences and promote energy conservation.
- 
Improved Energy Efficiency: Improved energy efficiency occurs when homeowners can optimize their heating system. WiFi thermostats allow users to monitor and adjust settings in real time. The U.S. Department of Energy states that properly set thermostats can save about 10-15% on heating and cooling costs annually. For instance, a family that utilizes a WiFi thermostat may use less energy while maintaining comfortable home temperatures.
 - 
Remote Control Access: Remote control access enables homeowners to adjust their heating settings from anywhere via smartphone apps. This feature promotes convenience and flexibility. For example, if a homeowner is delayed at work, they can delay heating the home until closer to their arrival, saving energy and ensuring warmth upon return.
 - 
Customizable Heating Schedules: Customizable heating schedules allow homeowners to set specific times for their furnace operation. This feature enables users to align heating with their daily routines, increasing comfort. According to a study by Energy Star, programmable thermostats can reduce energy usage by as much as 30% if used correctly.
 - 
Maintenance Alerts: Maintenance alerts help homeowners stay proactive about furnace care. WiFi thermostats can remind users when it’s time for filter changes or service appointments. The Environmental Protection Agency emphasizes that regular maintenance improves the lifespan of heating systems and helps maintain efficiency.
 - 
Integration with Smart Home Systems: Integration with smart home systems extends functionality. Homeowners can connect their thermostats to other smart devices, such as lights or security systems, for a cohesive experience. According to Consumer Technology Association research, homes with smart technology report higher energy efficiency and greater convenience.
 
In summary, WiFi gas furnace thermostats offer numerous benefits that enhance home heating efficiency, convenience, and comfort.
How Do the Top-Rated WiFi Gas Furnace Thermostats Compare?
Here is a comparison of some top-rated WiFi gas furnace thermostats:
| Thermostat Model | Features | Price Range | Compatibility | Energy Efficiency Rating | Warranty | 
|---|---|---|---|---|---|
| Ecobee SmartThermostat | Voice control, room sensors, energy reports | $249 – $299 | Most gas furnaces | Up to 23% | 3 years | 
| Nest Learning Thermostat | Learning capability, remote control, energy-saving features | $249 – $279 | Most gas furnaces | Up to 15% | 2 years | 
| Honeywell Home T9 | Smart room sensors, geofencing, remote access | $199 – $249 | Most gas furnaces | Up to 20% | 3 years | 
| Emerson Sensi Touch | Touchscreen, app control, smart alerts | $129 – $169 | Most gas furnaces | Up to 10% | 1 year | 
What Are the User-Friendly Controls Available in Today’s Best WiFi Gas Furnace Thermostats?
Today’s best WiFi gas furnace thermostats offer a variety of user-friendly controls. These features enhance ease of use and improve energy efficiency.
- Touchscreen Interface
 - Mobile App Control
 - Voice Control Compatibility
 - Programmable Scheduling
 - Energy Usage Reports
 - Smart Home Integration
 - Geofencing Features
 - Remote Temperature Sensors
 
The variety of user-friendly controls available in WiFi gas furnace thermostats provides different functionalities to meet user preferences and needs.
- 
Touchscreen Interface: Touchscreen interfaces are prevalent in modern WiFi gas furnace thermostats. They provide intuitive navigation and user interaction. Studies show that a touchscreen can reduce the time needed to adjust settings compared to traditional buttons. For example, the Nest Learning Thermostat features a responsive touchscreen that displays relevant information clearly, making it easier for users to understand and control their heating settings.
 - 
Mobile App Control: Mobile app control allows users to manage their thermostats remotely using smartphones or tablets. Users can adjust settings, create schedules, and monitor energy usage from anywhere. According to a 2020 survey by Energy Star, 65% of users found mobile control to be a significant advantage in managing their home heating systems effectively.
 - 
Voice Control Compatibility: Many WiFi gas furnace thermostats are compatible with voice assistants like Amazon Alexa or Google Assistant. Voice control allows for hands-free adjustments, which users find convenient. Research conducted by TechHive in 2021 showed that 45% of smart thermostat users prefer using voice commands to modify temperature settings while engaged in other activities.
 - 
Programmable Scheduling: Programmable scheduling enables users to set specific heating schedules based on daily routines. This feature helps improve energy efficiency and reduce heating costs. A recent energy study by the American Council for an Energy-Efficient Economy (ACEEE) found that programmable thermostats can save homeowners up to 10-15% on their annual heating bills.
 - 
Energy Usage Reports: Energy usage reports provide insights into heating patterns and energy consumption. This feature helps users track how much energy they use over time. A case study by the Lawrence Berkeley National Laboratory found that users who analyzed their energy reports could reduce their consumption by 5-10% through informed decisions.
 - 
Smart Home Integration: Smart home integration allows users to connect their thermostat with other smart devices like lighting and security systems. This interconnectedness enhances automation and offers greater control over the home environment. According to research by the Consumer Technology Association, 72% of smart device owners appreciate comprehensive management through a single application.
 - 
Geofencing Features: Geofencing features automatically adjust the temperature based on the user’s location. When users leave or return home, the thermostat can modify settings to save energy. A 2019 study by the National Renewable Energy Laboratory showed that homes equipped with geofencing technologies reduced unnecessary heating by 15-20% during unoccupied hours.
 - 
Remote Temperature Sensors: Remote temperature sensors can be placed in different rooms to ensure even heating throughout the home. They provide more accurate readings and adjust the heating accordingly. A 2021 demonstration by the U.S. Department of Energy indicated that homes using remote sensors experienced improved comfort and a decrease in overall energy usage.
 
How Can You Optimize Your WiFi Gas Furnace Thermostat for Maximum Performance?
To optimize your WiFi gas furnace thermostat for maximum performance, ensure proper placement, adjust settings for efficiency, and regularly update the device.
Proper placement is crucial for accurate temperature readings. Follow these guidelines:
- Avoid direct sunlight: Place the thermostat away from windows and direct sun exposure. Sunlight can cause false temperature readings and lead to inefficient heating.
 - Keep it away from drafts: Avoid locations near doors, windows, or air vents. Cold drafts can lower temperature readings, causing your heating system to overcompensate.
 - Choose a central location: Ideally, position the thermostat in a central area of your home. This placement ensures more accurate readings of the overall home temperature.
 
Adjusting settings effectively maximizes efficiency. Consider the following adjustments:
- Set a schedule: Program your thermostat to match your routine. For instance, lower the temperature at night and during work hours. According to the U.S. Department of Energy (2021), setting the thermostat back by 10°F to 15°F for eight hours can save 5% to 15% on heating bills.
 - Use energy-saving modes: Activate energy-saving settings when they are available. These modes can automatically adjust temperature settings based on your habits and preferences.
 - Monitor humidity levels: Maintaining a humidity level between 30% and 50% can enhance comfort. High humidity can make you feel warmer, while low humidity can make the air feel cooler.
 
Regular updates ensure optimal functionality and security. Check these maintenance tasks:
- Install firmware updates: Manufacturers often release updates that improve performance and security features. Regularly check for updates through your thermostat’s app.
 - Clean the thermostat: Dust and debris can accumulate. Clean the device gently with a soft cloth to maintain contact and response.
 - Test the system: Periodically test the heating system to ensure the thermostat communicates effectively with the gas furnace.
 
By focusing on placement, settings, and maintenance, you can achieve optimal performance with your WiFi gas furnace thermostat.
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