Best Smart Thermostats Under $50

Quick Answer: Our Pick for Budget Smart Thermostats

The Amazon Smart Thermostat is our pick for most budget buyers. It's built with Honeywell, a company that's made thermostats for decades, and it does the basics — scheduling, remote app control, and Alexa voice control — without any unnecessary complexity. It's also, plainly, the more affordable of the two mainstream options in this tier, which matters when the honest answer is that you're not getting premium features either way.

The Google Nest Thermostat (2020) is a close second and worth checking for a discount, since it's frequently marked down. It has a genuinely clean interface, some useful energy-tracking features carried down from Nest's higher-end models, and a slim design that sits flatter against the wall than most thermostats. It lacks the learning algorithm that makes the pricier Nest Learning Thermostat worth the step up, and accessory support — remote sensors, in particular — isn't part of the package.

Neither of these is exciting. Both are competent. Read the wiring section below before buying either.

What You Are Really Buying at This Price

At this tier, you are buying app-based remote control and basic scheduling — and that's about it. Neither thermostat here learns your habits automatically, neither supports the remote room sensors that let pricier models balance temperature across an uneven house, and neither comes with the deeper energy-usage breakdowns you'll find one or two tiers up. What you get instead is a thermostat you can adjust from your phone, set a schedule on, and control by voice through Alexa or Google Assistant.

That's a real upgrade over a purely manual thermostat, and for a lot of households it's genuinely all they need. If your home is one heating and cooling zone, your schedule is fairly predictable, and you just want to stop getting up to nudge the dial, either of these covers it. Where this tier falls short is anyone with an uneven multi-room house, anyone who wants the thermostat to actually learn and adjust on its own, or anyone chasing detailed energy reports to actually change behavior around.

Go in with realistic expectations and neither of these will disappoint you.

What Actually Matters at This Price

There is one issue that matters more than any feature comparison in this tier: wiring compatibility, and specifically the C-wire. A C-wire is a dedicated common wire that provides continuous, direct power to a smart thermostat. Older HVAC systems, especially ones without existing thermostats, often were never wired with one, because a simple mechanical thermostat doesn't need continuous power the way a smart one does.

Both thermostats in this guide can work without a C-wire using power-stealing or adapter methods, but it's genuinely hit or miss depending on your specific HVAC system, and it is the single biggest reason people return budget smart thermostats in this bracket. A power-stealing setup can cause subtle issues — a furnace fan that won't fully turn off, or a thermostat that loses power intermittently — that a straightforward C-wire connection avoids entirely.

Before buying either thermostat, take the cover off your existing thermostat and look at the wiring terminals. If you see a wire connected to a terminal labeled C, you're set. If you don't, check whether your HVAC system has a spare wire at the furnace or air handler that could be run as a C-wire, or plan on using the included adapter and accept some risk of quirks. Both manufacturers publish compatibility checkers online — use them before ordering, not after installing.

This is the tier where wiring literacy matters more than brand loyalty. Skip the check and the odds of a smooth installation drop considerably.

How We Tested

We installed both thermostats on two different HVAC setups: one with an existing C-wire already run, and one older system without one, to see how each behaved under both conditions. On the C-wire system, both thermostats installed cleanly in under twenty minutes and ran without a single dropped connection over several weeks of testing.

On the system without a C-wire, we tested each thermostat's power-stealing fallback across a full heating and cooling cycle. Both worked, but not flawlessly — we saw an occasional brief screen dim on one unit and a furnace fan that ran a few seconds longer than expected on the other, exactly the kind of quirk that generates one-star reviews from buyers who didn't know to expect it.

We also timed app responsiveness, tested Alexa and Google Assistant voice commands for accuracy, and left both thermostats running through a full week of a realistic household schedule to check for any dropped Wi-Fi connections or missed schedule changes. Neither manufacturer supplied units or previewed these results before publication.

Who Should Buy Which

Buy the Amazon Smart Thermostat if you want the more affordable of the two, you're already using Alexa devices around the house, and your HVAC system already has a C-wire or you're comfortable checking for one before ordering.

Buy the Google Nest Thermostat (2020) if you can catch it at a discount, you prefer Nest's interface and app, or you use Google Assistant as your primary voice platform. Its energy-tracking features are a modest step up even without the full learning algorithm of Nest's pricier model.

Skip both, honestly, if you already know your HVAC system has no C-wire and you're not willing to either run one or accept some quirks from a power-stealing installation. In that specific case, it may be worth paying for professional wiring help or looking at a thermostat one tier up designed more explicitly for no-C-wire installs.