The best smart thermostat is the one that matches your heating and cooling equipment, your wiring and how your household lives. For most homes, the ecobee Smart Thermostat Premium and the Google Nest Learning Thermostat (4th gen) are the two strongest all-around choices. Budget buyers with simple systems can do well with a Sensi or an Amazon Smart Thermostat. Below, we compare each option on price, features and compatibility, then explain what to check on a heat pump or an older furnace before you spend anything.
TL;DR
- ecobee Premium ($259.99) and Nest Learning 4th gen ($279.99) are the best fits for most homes, and ecobee is the stronger pick when you want remote sensors and a closer look at heat pump settings.
- Sensi ($89.99 to $209.99) and the Amazon Smart Thermostat (about $60 to $80) cover simple systems and tight budgets.
- Compatibility matters more than brand: your system type and wiring decide what will work, and a missing C-wire is usually solvable.
- Heat pumps, dual-fuel setups and multi-stage or variable-speed equipment are worth having a technician set up, so the thermostat controls the equipment the way it was designed to run.
- Savings come mostly from replacing a thermostat that was never being managed well, not from the device itself.
Table of Contents
- How we compared these thermostats
- Smart thermostat comparison at a glance
- ecobee Smart Thermostat Premium: best all-around pick
- Google Nest Learning Thermostat (4th gen): best for automatic scheduling
- Honeywell Home T9: a solid middle option with a sensor
- Sensi Lite, Smart and Touch 2: simple and affordable
- Amazon Smart Thermostat: lowest price, fewest extras
- Which one should you pick?
- Smart thermostat compatibility: what to check first
- Smart thermostats for older furnaces
- Do you need a C-wire?
- Best smart thermostat for a heat pump
- What smart thermostats actually save
- What installation costs and who should do it
- Our perspective
- Upgrading your system along with the thermostat
- FAQ
- Sources
How we compared these thermostats
We looked at what a homeowner actually has to decide: what the thermostat costs, what it does on its own, how it handles sensors and voice assistants, and whether it will work with the equipment on your wall and in your basement or furnace closet. Prices below come from the manufacturers’ own pages or from a 2026 price roundup, and they move with sales and retailers, so confirm the current figure before you buy.
We also lean on independent testing. Consumer Reports lab-tests smart thermostats and stresses ease of use: app connection, intuitive scheduling and integration with platforms such as Alexa, Google Home and Apple Home. Those are the right things to weigh, because a thermostat you find annoying is a thermostat you stop adjusting.
Smart thermostat comparison at a glance
| Model | Price | What stands out | Best for |
|---|---|---|---|
| ecobee Smart Thermostat Premium | $259.99 | Full-color touchscreen, SmartSensor, air quality monitoring, Alexa and Siri | Most homes, multi-room comfort |
| Google Nest Learning Thermostat (4th gen) | $279.99 | Learns your routine, includes a Nest Temperature Sensor | Hands-off households |
| Honeywell Home T9 | $209.99 | Wireless room sensor included | Rooms with uneven temperatures |
| Sensi Touch 2 | $209.99 | Touchscreen, geofencing, flexible scheduling | Simple systems, Sensi app fans |
| Sensi Smart | $129.99 | App control, geofencing | Mid-priced upgrade |
| Sensi Lite | $89.99 | Remote app access, scheduling | Basic smart control |
| Amazon Smart Thermostat | About $60 to $80 | Alexa control, lowest price | Tight budgets, Alexa homes |
Prices are U.S. list prices from the sources linked in the sections below.
ecobee Smart Thermostat Premium: best all-around pick
The ecobee Premium is priced at $259.99 and has a 4-inch full-color touchscreen, built-in air quality monitoring, radar-based occupancy and proximity sensing, Siri or Alexa support and a 3-year limited warranty. It also ships with a Power Extender Kit for installation in most homes without a C-wire, which removes one of the most common reasons a smart thermostat install stalls.
Why we like it for Colorado Springs homes: rooms here can swing a lot. A sunny south-facing living room and a cool basement bedroom rarely agree, and ecobee’s remote sensors let the thermostat weigh the rooms you actually use. Consumer Reports’ testing summary notes that ecobee is frequently cited for remote sensor support and compatibility with multi-stage systems, which matters if your furnace or air conditioner runs in more than one stage.
The tradeoff is price. It costs more than the entry-level models, and you will use its features only if you set up the sensors and schedules. If you want a thermostat you configure once and forget, read the Nest section next.
Google Nest Learning Thermostat (4th gen): best for automatic scheduling
Google prices the Nest Learning Thermostat 4th gen at $279.99, including a second-generation Nest Temperature Sensor, and it offers Adaptive Eco and what Google calls natural heating and cooling. In plain terms, it watches how you adjust the temperature and builds a schedule from it, so you do not have to program one.
That suits households whose routines are steady and who will never open a scheduling screen. It is also a good fit for people who already live in Google Home. Reviewers praise Nest for intuitive self-learning and occupancy-sensing routines, while ecobee tends to win on sensors and system flexibility.
If you are torn between the two, our installer-side look at ecobee versus Nest covers the three questions worth asking before you commit.
Honeywell Home T9: a solid middle option with a sensor
A 2026 price roundup lists the Honeywell T9 at $209.99 with a wireless sensor included. For homes with one stubborn hot or cold room, a sensor-equipped thermostat at this price is an easy way to get better room-by-room comfort without paying premium-tier money. Check the box or the product page for the exact system types it supports before ordering.
Sensi Lite, Smart and Touch 2: simple and affordable
Sensi’s current lineup is the Lite at $89.99, the Smart at $129.99 and the Touch 2 at $209.99. Sensi says these models provide remote app access, flexible scheduling and geofencing, and it cites about 23 percent annual energy savings. Treat that as the manufacturer’s claim: your result depends on how you used your old thermostat and how your home is built.
Sensi works well when you want app control on a conventional furnace and air conditioner and do not need sensors or learning. If you are replacing a basic manual thermostat and want a straightforward upgrade, the Lite or Smart is a sensible place to start.
Amazon Smart Thermostat: lowest price, fewest extras
The Amazon Smart Thermostat is the cheapest on this list. A 2026 roundup gives it a manufacturer MSRP of $59.99, and Amazon’s own page has shown it at $79.99, requiring a C-wire. It uses Honeywell Home technology and lets Alexa handle automatic home, away and sleep temperature control.
The C-wire requirement is the thing to check first. If your wall has one, this is an inexpensive way to get started. If it does not, the money you save on the device can go to an adapter or a technician visit.
Which one should you pick?
Match the thermostat to the problem you are trying to solve.
If your house has hot and cold rooms, pick ecobee Premium or the Honeywell T9, because sensors address the cause. If you want comfort without programming, pick Nest. If you mostly want to control the thermostat from your phone and keep the cost down, pick a Sensi or the Amazon model. If you have a heat pump, a dual-fuel system or multi-stage equipment, start with ecobee or Nest and plan on a professional setup, which the next sections explain.
Whichever you choose, make sure the thermostat works with the voice assistant or home platform you already use. Alexa, Google Home and Apple Home support differs by model, and Consumer Reports flags that integration as part of what makes a thermostat easy to live with.
Smart thermostat compatibility: what to check first
Before you add anything to a cart, look at three things: your system type, your wiring and the thermostat’s own compatibility list. Consumer Reports advises checking your HVAC system type and wiring and reading the packaging for exceptions, and it recommends asking an HVAC technician if you are unsure whether you have a C-wire.
The general picture is encouraging. ENERGY STAR says smart thermostats are compatible with most forced-air HVAC systems installed after 1975. The same page says most smart thermostats sold in the U.S. are not compatible with baseboard heating, biofuels or in-wall heaters. If your home heats with baseboard electric or an in-wall unit, a standard smart thermostat is probably not the right product, and a conversation with a technician will save you a return.
If you have a boiler, an evaporative (swamp) cooler or a mixed system, ask before you buy. Those setups often use different controls, and the answer depends on the specific equipment, so a quick call is cheaper than guessing.
Smart thermostats for older furnaces
An older furnace can work fine with a smart thermostat, as long as it is controlled by low-voltage wiring. ENERGY STAR explains that most smart thermostats use thin, low-voltage wires, and thick wires may indicate line-voltage control, which means the thermostat will likely be incompatible. Look at the wires behind your current thermostat. Thin, colored wires are a good sign. Thick wires attached to a bulky unit are a warning.
The same ENERGY STAR page says multi-stage, variable-speed or zoned systems will likely need professional installation. That is common on newer equipment and on older homes that have had a partial upgrade, such as a new furnace paired with a decades-old air conditioner.
Here is a practical way to approach it:
Take a photo of your current thermostat with the cover off, showing the wire labels and the terminals they connect to. Take a second photo of the label on your furnace and outdoor unit. Then compare against the compatibility checker on the thermostat maker’s site, or send the photos to your installer. That takes ten minutes and prevents most bad purchases.
If the furnace itself is near the end of its life, a thermostat will not fix the underlying problem. A new thermostat cannot make a failing heat exchanger safe or a worn inducer motor quiet. For a furnace that is cycling, short on heat or noisy, a furnace repair or tune-up visit tells you whether to keep the equipment or plan a replacement, and the thermostat can then be chosen to match whichever you end up with.
Do you need a C-wire?
Most smart thermostats need continuous power, and the C-wire (common wire) supplies it. Without one, the thermostat may drain its battery from the system, which can cause dropped Wi-Fi, a blank screen or short cycling.
You have options when the wire is missing. Amazon’s thermostat page states it requires a C-wire, so that model is a poor fit unless you can add one. Ecobee’s Premium includes a Power Extender Kit for most homes without a C-wire. Nest also sells a Power Connector for systems that need one. A technician can often run a new wire if there is an unused conductor in the existing bundle, or fit an adapter at the furnace control board.
The point is that a missing C-wire is a common and fixable situation, not a reason to give up on a smart thermostat. It is, however, one of the reasons professional installation tends to be worth it. A wire connected to the wrong terminal can trip a fuse on the control board.
Best smart thermostat for a heat pump
Heat pumps ask more of a thermostat than a simple furnace and air conditioner do. The thermostat has to manage the heat pump’s heating and cooling modes, and, on many systems, decide when to call for backup heat. That backup might be electric auxiliary or emergency heat, or a gas furnace in a dual-fuel setup.
Both ecobee and Nest are widely used with heat pumps, and we generally start there. The details that matter are wiring terminals and the settings that control when the compressor runs and when backup heat takes over. On a dual-fuel system, the thermostat needs sensible switchover logic so the heat pump and furnace are not fighting each other. Those settings should be tuned to your equipment and to Colorado temperatures, not left at defaults.
This is where we would not rely on a box-store install. Check the thermostat’s wiring guide for your specific heat pump, confirm it supports auxiliary or emergency heat if your system has it, and have a technician set the balance point. If you are considering a new heat pump, our current pricing starts at $6,500 for a 15 SEER2 single-stage model, $8,500 for a 17 SEER2 three-stage and $10,000 for an 18 SEER2 variable model. Those variable and multi-stage systems are exactly the kind of equipment that benefits from a thermostat chosen and configured alongside them.
If zones are part of your plan, read about HVAC zoning costs and quote traps before you buy, because zoning changes which thermostat setup makes sense.
What smart thermostats actually save
A smart thermostat does not use much energy itself. As ENERGY STAR puts it, the device controls equipment that uses a lot of energy for heating and cooling. Savings come from scheduling, geofencing (turning the setback on when everyone leaves) and sensors that react to which rooms are occupied.
The biggest gains tend to go to homes where the old thermostat was set once and left, or where the house was heated and cooled around the clock for nobody. If you already run a disciplined manual schedule, the gain is smaller. Sensi’s 23 percent figure is the maker’s claim, and your own result will depend on your home, your habits and your equipment. Utilities in many areas also offer rebates on smart thermostats, so check your electric and gas provider’s programs before you buy.
A thermostat is one piece of the efficiency picture. Insulation, duct condition, filter changes and equipment age all matter, and so does heat coming in through the roof. Reducing heat gain on an aging asphalt roof is one way to ease the load, and roof treatment for cooling demand is worth reading if your attic runs hot in summer. For the heating season, our guide to winter thermostat settings that actually save money shows how to set schedules and setbacks, and our overview of HVAC energy efficiency that saves covers the rest of the house.
What installation costs and who should do it
Many homeowners can swap a basic thermostat on a conventional system. A professional is the better call with a heat pump, dual-fuel, multi-stage or variable-speed equipment, zoning, a missing C-wire or any wiring you cannot identify. We break down typical labor in our guide to smart thermostat installation cost, and our look at smart thermostat HVAC trends explains where the technology is headed. If you want to see what automation can do beyond temperature, there are real examples of HVAC automation benefits for homes and businesses.
Our perspective
We install and service heating and cooling equipment in Colorado Springs every day, and the thermostat questions we hear are rarely about brand. They are about whether the new device will work with a furnace that is fifteen years old, why one bedroom never gets comfortable, or how to keep a heat pump from running backup heat more than it should.
Our view is that a smart thermostat is part of the system, not an accessory. At this altitude, with big temperature swings between day and night, equipment runs differently than the manual assumes. A thermostat set up with the right stages, the right switchover point and sensors in the right rooms can make a good system feel better. Put on the wrong terminals or left at default settings, it can waste the potential of the equipment it controls.
That is why we pair thermostat choices with the equipment. Our NATE-certified technicians look at the furnace, the air conditioner or heat pump and the wiring first, then recommend a thermostat that fits, and we quote flat-rate upfront pricing so you know the cost before the work starts. Our team brings over 40 years of combined experience, and our work is backed by a workmanship guarantee.
If you are replacing a furnace or air conditioner, choose the thermostat at the same time. It is the cheapest moment to get it right.
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Upgrading your system along with the thermostat
If your furnace or air conditioner is nearing the end of its life, a smart thermostat is best chosen together with the new equipment, because the stage count and modulation of the system determine how much the thermostat can do. Our published starting prices for furnaces are $4,500 for an 80% AFUE two-stage variable speed model, $6,500 for a 96% AFUE variable speed condensing gas furnace and $8,250 for a 98% AFUE modulating gas furnace. Air conditioners start at $5,500 for a 14 SEER2 single-stage model and $6,500 for a 16+ SEER2 single-stage model, with full details on our AC pricing page. You can also compare our system packages of AC, heat pump and furnace bundles.
We serve Colorado Springs and surrounding communities, and we can walk you through the right match for your home and budget.
Ready to choose a thermostat that works with your equipment? Contact Strong Heating And Cooling and we will check your wiring, your system type and your goals, then install and set up the thermostat so it runs your equipment the way it was designed to.
FAQ
What is the best smart thermostat overall?
For most homes, the ecobee Smart Thermostat Premium is our pick, thanks to its sensors, touchscreen and broad system support. The Google Nest Learning Thermostat is the better choice if you want it to learn your schedule automatically. Both cost more than basic models, so match the choice to your equipment and habits.
Will a smart thermostat work with my old furnace?
Usually yes, if the furnace uses low-voltage wiring. ENERGY STAR says smart thermostats are compatible with most forced-air systems installed after 1975, but thick wires can signal line-voltage control, which is not compatible. Photograph your wiring and equipment labels and check them against the thermostat’s compatibility tool or ask an installer.
Do I need a C-wire for a smart thermostat?
Most models need one for steady power. If your wall does not have a C-wire, some thermostats include or support an adapter, such as the Power Extender Kit in the ecobee Premium box, and a technician can often add a wire. The Amazon Smart Thermostat requires a C-wire.
Which smart thermostat is best for a heat pump?
Ecobee and Nest are the two we start with. The important part is confirming support for your system’s auxiliary or emergency heat terminals and setting the switchover point for your climate. Have a technician check this on heat pumps and dual-fuel systems.
How much can a smart thermostat save?
It depends on your starting point. Gains are largest when replacing a thermostat that was never scheduled well. Sensi cites about 23 percent annual savings for its models, but that is a manufacturer claim, and your own result will vary with your home and habits.
Sources
- Smart Thermostats, ENERGY STAR
- 8 Best Smart Thermostats of 2026, Consumer Reports
- Thermostat Buying Guide, Consumer Reports
- ecobee Smart Thermostat Premium
- Nest Learning Thermostat (4th gen), Google Store
- Sensi Smart Wi-Fi Thermostat
- Amazon Smart Thermostat
- Best Smart Thermostats (2026), Front Desk Review
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