Pre-AC season is when Reddit's smart home communities get the most heated — and for good reason. A smart thermostat can cut your energy bill by 10–23% while making your home genuinely more comfortable. But the "Nest vs Ecobee" debate has raged for years. We sorted through 13,800+ comments to give you a clear answer by use case, not just a ranking.
Auto-Learning · Reddit's Set-and-Forget Champion
Google Nest Learning Thermostat (3rd Gen)
The Nest Learning Thermostat is the thermostat Reddit recommends when someone says they want to stop thinking about their thermostat entirely. After about a week of normal use, it builds a schedule automatically — learning when you wake up, leave, come home, and go to bed. After two weeks, most users in r/HomeAutomation report they never touch it manually again.
The round stainless steel design remains one of the cleanest-looking smart home devices ever made. It doesn't scream "tech gadget" on your wall — it looks like a premium thermostat that happens to be smart. Farsight technology lights up the display as you approach, showing temperature and time from across the room.
One important note for buyers: the 3rd Gen Nest Learning Thermostat requires a C-wire on most HVAC systems. Check compatibility at nest.com/compatibility before buying. Also of note: Google released a 4th Gen Nest Learning Thermostat in late 2024 — if you want the newest generation with a larger display, look for that listing. Either generation delivers the core learning experience Reddit loves.
"The learning actually works. Within two weeks it had my routine figured out. I haven't touched the thermostat manually since I set it up four months ago — it just runs itself."
"Moved into a new place and went straight to Nest. The auto-away feature alone saves me money every month. It knows when the house is empty without me setting anything up."
Multi-Room + Air Quality · Reddit's Ecosystem Winner
Ecobee Smart Thermostat Premium
If you ask r/ecobee or r/HomeAutomation which thermostat they'd buy if money wasn't the deciding factor, the Ecobee Smart Thermostat Premium wins by a wide margin. It's not just a thermostat — it's a room comfort system. The included SmartSensor detects temperature and occupancy in up to two separate rooms, telling the thermostat to keep the bedroom at 68°F rather than basing everything off the hallway sensor where your old thermostat sat.
The built-in air quality sensor is a feature Reddit users consistently call out as a surprise hit. It monitors VOC levels and CO₂ in real time, displaying them on the home screen. Several users in r/HomeAutomation reported discovering genuinely poor air quality they had no idea about — and traced it to everything from new furniture off-gassing to a gas stove. For households with allergies or respiratory concerns, this alone can justify the price. The Ecobee Premium also pairs naturally with the air purifiers Reddit recommends most for a complete indoor air quality setup.
Unlike Nest, Ecobee works natively with all three voice assistants — Alexa is built directly into the thermostat itself (the display has a speaker), plus full Google Assistant and Apple HomeKit support. It's the only thermostat on this list that works fully across all three ecosystems without compromise.
"The built-in air quality sensor alone justified the price for me. I had no idea my VOC levels were that high until Ecobee flagged it. Opened the windows for a few days, problem solved. I never would have known otherwise."
"The remote sensor changed everything. The bedroom stays at 68°F now instead of the hallway reading 74°. My old Nest had no idea the bedroom was even there."
Budget Nest · Best Value Smart Learning
Google Nest Thermostat (2020)
Reddit's consensus on the 2020 Nest Thermostat is remarkably consistent: it delivers about 90% of the Nest Learning experience at roughly half the price, and for most households that's the right trade-off. You get scheduling, auto-away, remote control via the Google Home app, and the familiar Nest interface. What you don't get is the self-learning algorithm — you'll set a schedule manually rather than letting it learn.
The design update for 2020 brought a new look with a color-matched display surround (available in Snow, Sand, Charcoal, and Fog) that blends into your wall rather than standing out as a device. It's the most visually subtle smart thermostat on this list. Installation is also notably simpler than the Learning Thermostat, and it doesn't require a C-wire in most installations — making it the easiest Nest to drop into an older home.
"For $130 you get 90% of what the Learning Thermostat gives you. The auto-away works, the app is clean, energy history is there. Unless you really need it to learn on its own, save the $120 and get this one."
Mid-Tier Ecobee · Best Value Ecobee
Ecobee Smart Thermostat Enhanced
The Ecobee Enhanced is the model Reddit recommends when someone wants Ecobee quality without the $249 of the Premium. At around $190, it includes the full Ecobee app experience, native Apple HomeKit, built-in Alexa, and Google Assistant support. The key omission versus the Premium is the air quality sensor — there's no VOC or CO₂ monitoring. The SmartSensor is also sold separately rather than bundled in.
R/ecobee users point out a nuance worth knowing: the Enhanced doesn't include a SmartSensor, but you can buy additional sensors separately for about $40 each. If you only need one extra room covered (a bedroom is the most common use case), buying the Enhanced plus one sensor costs about the same as buying the Premium standalone — you just don't get the air quality monitoring. For buyers who don't care about air quality data, the Enhanced is the better value.
"The Enhanced hits the sweet spot. Full Ecobee app, HomeKit support, Alexa built in, great scheduling. I didn't need the air quality sensor so I saved $60. No regrets."
"If you want sensors later, the Enhanced makes sense. Sensors are $40 each and you only need one in the room you're in most. No reason to pay for the Premium's bundled sensor if you only need one zone."
HomeKit · Reddit's Apple Home Pick
Honeywell Home T9 Smart Thermostat
The Honeywell T9 has a loyal following in Reddit's HomeKit communities for a specific reason: its room sensors measure both temperature and humidity. Nest and Ecobee remote sensors measure temperature only. For households dealing with dry winters, humid summers, or basements with moisture issues, that extra humidity data makes a meaningful difference in comfort — and in catching problems before they become expensive.
The T9 added HomeKit support in 2021, and r/smarthome users report it works cleanly — accessible through the Home app, compatible with Siri automations, and responsive. It's the most complete HomeKit thermostat option for households already invested in the Apple ecosystem. The companion app (Resideo) is functional if not as polished as Nest or Ecobee, but most HomeKit users end up managing it through the Home app anyway.
"The T9 is the only thermostat that works natively with HomeKit and has proper room sensors. Ecobee eventually got HomeKit but the T9 has always been the cleaner Apple integration for my setup."
"Humidity + temperature in the same sensor is what makes the T9 stand apart. My old thermostat had no idea the bedroom was at 65% humidity. The T9 reads it immediately and I can tie automations to it."
Budget Pick · Best Sub-$100 Thermostat
Amazon Smart Thermostat
The Amazon Smart Thermostat is Reddit's no-brainer recommendation for anyone who already uses Alexa and wants to stop manually adjusting their thermostat. At under $80, it costs less than a quarter of the Nest Learning Thermostat — and for many households, it covers 100% of what they actually need: scheduling, remote access via the Alexa app, and voice control. "Alexa, set the thermostat to 68" works flawlessly.
What you give up is learning and ecosystem breadth. The Amazon thermostat doesn't learn your schedule — you set it manually. It doesn't have room sensors, air quality monitoring, or native HomeKit support. Build quality is functional but noticeably more budget-feel than Nest or Ecobee. Reddit users are consistent about this trade-off: if you want to just schedule your HVAC and control it from your phone or with Alexa, this is the best $80 you can spend. If you want any of the premium features, spend the extra $50–$170 and step up to a Nest or Ecobee.
Energy Star certified and backed by Honeywell's HVAC technology under the hood, the Amazon thermostat works with virtually all forced air HVAC systems. The in-app installation guide is widely praised in r/homeowners as the easiest among any smart thermostat.
"It's $80, installs in 20 minutes, works perfectly with my Echo routines. When I leave the house I say 'Alexa, set thermostat to 65' and it just does it. That's genuinely all I needed."
"Don't overthink it if you just want scheduling and remote access. The Amazon thermostat does exactly what it promises — no fuss, no subscription, no learning curve."