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Honeywell Home RTH221B1039 Thermostat

Curated from 118 real Reddit conversations

Refreshed on: April 9, 2025

Honeywell Home RTH221B1039 Thermostat

Brand: Honeywell Home

Price: $16

Snoop Score:

6.5

Sentiment

5.0

Popularity

7.3

Technical

6.7

Buy on Amazon for $16 See All Thermostats Reviews

As an Amazon Associate, I earn from qualifying purchases.

Snoop's Take

The Honeywell Home RTH221B1039 is a one-week programmable thermostat designed to provide precise temperature control and easy installation. This thermostat allows users to set a single program for the entire week with four distinct program periods daily, ensuring comfort and convenience in managing home heating and cooling systems. Consumer sentiment reflects a mix of appreciation for the thermostat's reliability and ease of use, with many praising its performance and mobile control capabilities. "I’ll never go back to a regular thermostat" and "It's freaking amazing! It is so efficient, no temp swings, no babysitting it," indicate that users value the simplicity and efficiency it brings to their daily lives, despite some concerns regarding app connectivity and potential overheating issues. Overall, the Honeywell Home RTH221B1039 is recommended for those seeking a straightforward and reliable thermostat solution. While there are some criticisms regarding app performance and specific safety concerns, its strong user satisfaction in core functionalities makes it a solid choice in its category.

Not for you? Check out our other rated Thermostats

Not pretty, but pretty bulletproof.
Positive Feedback

The wall around the thermostat also started to get hot so we haven't been using it the past few days.
Negative Feedback

6.5

Honeywell Home RTH221B1039 Thermostat

Buy on Amazon for $16

Custom Temperature Scheduling

7 / 10

Remote Access and Alerts

6 / 10

Energy Bill Savings

5 / 10

Maintenance Reminders

9 / 10

See how this compares to all Thermostats

What it does well!

Key strengths users can’t stop talking about.

Honeywell thermostats are reliable and easy to install

“Not pretty, but pretty bulletproof.”➕

Honeywell thermostats are solid performers with no downtime

“Solid performers. Never had issues with them crashing or being down for updates.”➕

Convenient mobile control for HVAC settings

“I’ll never go back to a regular thermostat.”➕

“I love it! I can control it from my phone so I don't have to get up.”➕

Quality of life improvement with easy adjustments

“Seems minor but it's such a huge quality of life improvement.”➕

Better user experience than cheaper thermostats

“Why smart thermostats don't always save you money.”➕

Basic traditional thermostat expectations met

“if you are looking for a basic traditional thermostat, you can do fine on redline.”➕

Auto changeover capability

“Pretty happy with it.”➕

Compatible with various home automation systems

“I've been able to access all the settings I need via ZWave to MQTT Control Panel.”➕

Efficient temperature control without swings

“It's freaking amazing! It is so efficient, no temp swings, no babysitting it.”➕

Positive installation experience with T9

“I installed a T9 earlier this year, really liked it.”➕

Where it needs some work!

Areas to watch—feedback on possible improvements.

Product may overheat and cause safety issues

“The wall around the thermostat also started to get hot so we haven't been using it the past few days.”➕

“it sounds like it is indeed drawing too much power and causing the wire to overheat.”➕

Resideo app data is laggy and not real-time

“when I look at runtime in the Resideo app it’s always days behind.”➕

Concerns about product reliability

“Having a flaky thermostat is far different than having a flaky camera.”➕

Basic functionality compared to competitors

“It’s nothing more than a basic thermostat that I can control from my phone.”➕

RedLink Gateway reliability issues

“RedLink SUCKS!”➕

“Our Redline Gateway NEVER works, it's the most frustrating thing on the planet.”➕

Lack of smart features compared to competitors

“It is the dumbest "smart" device I've ever encountered.”➕

App connectivity issues

“the app is not available in your country or region”➕

“I’m having the same problem! Did you figure it out?”➕

“Happy to see it’s been going on for years and they haven’t fixed it yet 🤦‍♂️”➕

Increased energy usage compared to older thermostats

“the Honeywell T-6 Pro will not let the indoor ambient temp go over the set temp on the thermostat.”➕

Thermostat may run longer than necessary to reach desired temperature

“some thermostats will turn off once they hit the desired temp, and others will run until they hit a degree lower.”➕

Slow app response

“Control from the smartphone app is a little slower than I would like but the 'heating efficiency' with gas + heatpump for me is really good.”➕

Compare On All Talked About Dimensions

Product Name	Price	Score	See Details	Buy Now
Honeywell Home RTH2300B1038 Programmable Thermostat	$26	7.9	Details	Buy
Honeywell Home RTH6580WF Wi-Fi 7-Day Programmable Thermostat	$63	7.9	Details	Buy
ecobee Smart Thermostat Essential	$129	7.5	Details	Buy
Google Nest Thermostat E - Smart Thermostat	$82	7.3	Details	Buy
Emerson 1F83C-11PR Programmable Thermostat	$44	7.1	Details	Buy
Honeywell Home RTH221B1039 Thermostat	$16	6.5	Details	Buy
Google Nest Thermostat - Smart Thermostat for Home	$98	5.8	Details	Buy
Amazon Smart Thermostat	$63	4.7	Details	Buy
Honeywell Home CT87K1004 Manual Thermostat	$29	4.4	Details	Buy
Honeywell CT30A1005 Standard Manual Economy Thermostat	$16	4.1	Details	Buy
Suuwer Non-Programmable Thermostat for Home	$26	2.6	Details	Buy
Emerson Thermostats 1E78-140 Non-Programmable Heat Only Thermostat	$22	1.0	Details	Buy

Core Power Plays

The specs and strengths that make it shine.

Discussion on the merits of different smart thermostat brands

“I absolutely love Wyze. But I also think sometimes it is good to have different "smart" items from different vendors.”➕

Hidden Hero Hacks

Unexpected tricks and side‑door uses you’ll love.

Advice on using Z-Wave or Zigbee for smart home integration

“It doesn't matter where I am, as long as I have internet access, I can either open the Home Assistant app on my phone or log into ha.mydomain.com through any computer to control the thermostat.”➕

Buyer’s Cheat Sheet

What to check before you click ‘Add to Cart.’

Electrical expertise is suggested for installation and troubleshooting

“Seriously, you should probably have someone who knows what they're doing take a look.”➕

“What is the total wattage of the heaters?”➕

“Are you sure that power is going through the unit on to the heaters?”➕

“**It is always best to get a qualified electrician to perform any electrical work you may need.**”➕

Honeywell T6 pro Z-Wave mentioned as a potential alternative

“Let Home Assistant do geofencing and the like, let the thermostat be a thermostat.”➕

“I am specifically looking at the T6 Pro Z-Wave version.”➕

Discussion on auto-switch capabilities among different thermostat models

“Do I really need to pay attention to the forecast every day of spring and fall?”➕

“Most smart thermostats do.”➕

Considerations for thermostat functionality based on climate and seasonal changes

“Only issue I have had is a hard lockout when the reversing switch goes from heat to cool and vice versa.”➕

Discussion about the need for a wireless thermostat solution

“Just want to make as simple as possible and reliable with one app, bummed the wire got lost.”➕

Discussion on customization options for smart thermostats

“Stupid code block doesn't work. sorry about the formatting.”➕

“Is there a way i can connect this thermostat to an app or qolsys panel?”➕

“I don’t have this many customization options!”➕

Comparison of different Honeywell thermostat models

“the ecobee had really awesome smart features, but temp wise the swing was just too much.”➕

Discussion on HVAC compatibility issues with smart thermostats

“If all HVAC guys hate Nest, what’s the best smart thermostat?”➕

“Smart thermostats are super convenient like being able to adjust the temp remotely but only if they actually play nice with your system.”➕

Discussion on preferred smart thermostat brands

“I just need to get some better temp controls and want to "future proof".”➕

“I've had great experience with Ecobee.”➕

Mention of an affordable Zigbee thermostat

“Best money I've spent on my HA stuff yet!”➕

Discussion on temperature swing settings affecting energy usage

“That's called the 'swing' temp. Worth a look especially if the area where the thermostat is isn't representative of the temp of the whole house.”➕

“You should be able to set the temperture delta in the thermostat settings.”➕

Comparison with other smart thermostats

“the Nest Thermostat (new 2020 model) and I hate it, the mirror is so flashy - I see my reflection all the time.”➕

Discussion on preference between Honeywell and Nest thermostats

“I kind of hate the Honeywell.”➕

“While the installer emphasized efficiency, it's essential to prioritize user experience too.”➕

“If you haven't programmed the Honeywell with any schedule/setbacks then the Nest would probably deliver superior savings.”➕

“Honestly, as someone with a smart home run entirely on google devices, this Honeywell thermostat is wayyyy better.”➕

Cautionary Callouts

Know the pitfalls before they catch you off guard.

Concerns about smart thermostats becoming obsolete

“My current "dumb" thermostat seems like it will last forever, as in it could never be obsolete because it's so simple.”➕

Suggestions for troubleshooting unresponsive touchscreen

“Hopefully, you can avoid calling someone and save a bit on the repair costs.”➕

“Dealing with this same issue, I’m going to give it a try.”➕

Concerns about energy company control over thermostat settings

“some energy company's have a clause in the 'free smart thermostat' program that lets the energy company change temp settings to assist with peak demands.”➕