Yes, you can absolutely replace an old thermostat with a Google Nest. Most homeowners can complete this swap in about 20–30 minutes.
While the Nest Thermostat offers excellent smart features and sleek design, its major drawbacks include high upfront costs, reliance on a working Wi-Fi connection, and strict HVAC compatibility requirements (frequently requiring a 'C-wire'). Furthermore, the algorithm can struggle with multi-level homes or erratic schedules, sometimes resulting in user discomfort.
Millivolt thermostats are the most common type used for gas fireplaces while 24 volt thermostats are common for furnaces or boilers. When the room temperature falls below the thermostat's set temperature, the IPI module triggers the gas fireplace to ignite, increasing the heat output.
Google has completely phased out app support for 1st and 2nd generation Nest Learning Thermostats. As of late 2025, these older models lost their cloud features, meaning you can no longer control them remotely, adjust schedules via your phone, or link them with Google Home.
No, Nest thermostats are not directly compatible with standard electric baseboard heaters.
Average Installation Cost: The average cost for installing a smart thermostat typically falls between $200 and $500. This range covers most brands, including popular choices like Google Nest and Ecobee, which balance affordability with advanced functionality.
Baseboard heaters are great for heating your home and making it comfortable for you to live in; however, not all models are equipped for efficiency. This is especially the case if your home has an electric baseboard heater, as they could use more energy than you intend.
Whether you are replacing an older unsupported Nest Learning Thermostat (like Gen 1 or 2) or upgrading to the newest Google Nest Learning Thermostat, replacing a Nest is a straightforward DIY project that takes about 30 to 60 minutes.
The choice between Ecobee and Google Nest comes down to your home setup. Ecobee is best for multi-room homes, smart home enthusiasts, and Apple HomeKit users, featuring advanced remote sensors and multi-platform support. Nest excels in automation with superior AI learning, a sleek aesthetic, and zero-effort scheduling.
Nest has announced the end of support for Nest Learning Thermostats (1st and 2nd gen). Your thermostat will no longer connect to or work in the Google Nest app or Google Home app starting from 25 October 2025. Users of the affected devices received an email notification with an offer.
The low voltage Zigbee (TH1400ZB) and Wi-Fi (TH1400WF) thermostats allow remote control of certain gas fireplaces, requiring a relay and a 24 VAC transformer. Installation must be performed by a qualified electrician.
Disconnect the old thermostat and unscrew the mounting plate. Check the new thermostat instructions for compatibility and wiring guidance. Connect the labeled wires to the new thermostat. Attach the new mounting plate to the wall.
Explained, the chimney pipe must be a minimum of three feet above the roof but also two feet taller than anything within ten feet. The portion of the rule stating the pipe needs to be 2 feet above anything within 10 feet is where most people get confused.
Nest Thermostat Alternative
Most homeowners can easily install a Google Nest thermostat on their own in just 20-30 minutes when they follow the Nest app's step-by-step instructions. If you want to install your Nest thermostat by yourself, go to Install your thermostat on the wall.
Millivolt thermostats are typically used with a fireplace or gas-fired floor or wall heater that doesn't use electricity. Older systems with pilot lights may use millivolt controls.
The Google Nest Learning Thermostat (4th Gen) is the best overall smart thermostat. Featuring a stunning crystal dome display, it uses advanced AI to automatically learn your routines. For multi-room comfort, it comes bundled with a remote temperature sensor to resolve localized hot and cold spots.
In November 2021, ecobee announced that it would be acquired by Generac Holdings for $770 million.
The most common problem with Nest thermostats is power-related issues (often indicated by a "Delayed" message or the thermostat frequently disconnecting from Wi-Fi). This usually happens because the thermostat "steals" power from your HVAC system's wires to charge its internal battery and frequently starves for power if a dedicated "C-wire" (Common wire) is not installed.
Today, Nest is no longer the flagship brand for smart homes. Instead, it's more of a sub-brand within Google's hardware portfolio. Because technology is apparently obligated to continue to march on, Google says that the oldest Nest thermostats are basically obsolete.
Whether you should upgrade depends on the generation of your current Nest Thermostat.
Honeywell to Nest Thermostat Compatibility and Cost Savings
When replacing a Honeywell thermostat with a Nest, verify your HVAC system's wiring, especially the C-wire for continuous power. Without a C-wire, Nest may rely on battery or power stealing, causing performance issues.
In most homes, Heating and Cooling (HVAC) systems drive the highest energy costs, accounting for nearly 40% to 50% of your total electricity bill. Following these, the appliances that run up your bill the most include water heaters, refrigerators, and laundry machines.
It takes time for your home to warm up and cool down. If you're not sure how long it takes, try turning the heating on about 30 minutes before you need it. You should turn it off 30 minutes before you'll stop needing it.
Is 72 a good temperature for heat in the winter? While slightly higher than the typical energy-saving range of 68°F–70°F, 72°F still offers a reasonable balance between comfort and efficiency.