Internet #206150148

Model # RTHL3550

Honeywell Discontinued

Deluxe Digital Non-Programmable Heat/Cool Thermostat

  • Features a large, clear, backlit digital display
  • Offers precise temperature control of +/-1 Degrees F
  • Shows temperatures in either degrees Celsius or Fahrenheit
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Frequently Bought Together

Frequently Bought Together

Product Overview

  • Features a large, clear, backlit digital display
  • Offers precise temperature control of +/-1 Degrees F
  • Shows temperatures in either degrees Celsius or Fahrenheit
Honeywell's Deluxe Digital Non-Programmable Heat/Cool Thermostat offers simplicity and comfort, yet great functionality. It features a large screen and wide variety of features. It's even easy to install and use.
  • Easy to use - straight forward display and basic buttons keep operation simple
  • Large, clear, backlit digital display - easy to read in various lighting conditions
  • Determines if your home needs heating to cooling and automatically changes to provide maximum comfort
  • Temperature range limits - sets minimum cool and maximum heat temperature settings
  • Offers precise temperature control of +/-1 Degrees F to maximize comfort
  • Versatile display options - shows temperatures in degrees Celsius or Fahrenheit
  • Easy-access battery replacement - flip-out door for easy battery replacement without removing or disassembling the thermostat
  • Compatible with heating and cooling plus heat pumps with auxiliary
  • Does not work with electric baseboard heat (120-240-Volt)
  • How to choose the right thermostat for your home
  • Click here for more information on Electronic Recycling Programs

Product Overview

  • Features a large, clear, backlit digital display
  • Offers precise temperature control of +/-1 Degrees F
  • Shows temperatures in either degrees Celsius or Fahrenheit
Model #: RTHL3550
Internet #: 206150148

Honeywell's Deluxe Digital Non-Programmable Heat/Cool Thermostat offers simplicity and comfort, yet great functionality. It features a large screen and wide variety of features. It's even easy to install and use.

  • Easy to use - straight forward display and basic buttons keep operation simple
  • Large, clear, backlit digital display - easy to read in various lighting conditions
  • Determines if your home needs heating to cooling and automatically changes to provide maximum comfort
  • Temperature range limits - sets minimum cool and maximum heat temperature settings
  • Offers precise temperature control of +/-1 Degrees F to maximize comfort
  • Versatile display options - shows temperatures in degrees Celsius or Fahrenheit
  • Easy-access battery replacement - flip-out door for easy battery replacement without removing or disassembling the thermostat
  • Compatible with heating and cooling plus heat pumps with auxiliary
  • Does not work with electric baseboard heat (120-240-Volt)
  • How to choose the right thermostat for your home
  • Click here for more information on Electronic Recycling Programs

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents. Download a free copy from the Adobe Web site.

Key Features

Product Overview
Key Features
  • Features a large, clear, backlit digital display
  • Offers precise temperature control of +/-1 Degrees F
  • Shows temperatures in either degrees Celsius or Fahrenheit
Honeywell's Deluxe Digital Non-Programmable Heat/Cool Thermostat offers simplicity and comfort, yet great functionality. It features a large screen and wide variety of features. It's even easy to install and use.
  • Easy to use - straight forward display and basic buttons keep operation simple
  • Large, clear, backlit digital display - easy to read in various lighting conditions
  • Determines if your home needs heating to cooling and automatically changes to provide maximum comfort
  • Temperature range limits - sets minimum cool and maximum heat temperature settings
  • Offers precise temperature control of +/-1 Degrees F to maximize comfort
  • Versatile display options - shows temperatures in degrees Celsius or Fahrenheit
  • Easy-access battery replacement - flip-out door for easy battery replacement without removing or disassembling the thermostat
  • Compatible with heating and cooling plus heat pumps with auxiliary
  • Does not work with electric baseboard heat (120-240-Volt)
  • How to choose the right thermostat for your home
  • Click here for more information on Electronic Recycling Programs

Product Overview

  • Features a large, clear, backlit digital display
  • Offers precise temperature control of +/-1 Degrees F
  • Shows temperatures in either degrees Celsius or Fahrenheit
Model #: RTHL3550
Internet #: 206150148

Honeywell's Deluxe Digital Non-Programmable Heat/Cool Thermostat offers simplicity and comfort, yet great functionality. It features a large screen and wide variety of features. It's even easy to install and use.

  • Easy to use - straight forward display and basic buttons keep operation simple
  • Large, clear, backlit digital display - easy to read in various lighting conditions
  • Determines if your home needs heating to cooling and automatically changes to provide maximum comfort
  • Temperature range limits - sets minimum cool and maximum heat temperature settings
  • Offers precise temperature control of +/-1 Degrees F to maximize comfort
  • Versatile display options - shows temperatures in degrees Celsius or Fahrenheit
  • Easy-access battery replacement - flip-out door for easy battery replacement without removing or disassembling the thermostat
  • Compatible with heating and cooling plus heat pumps with auxiliary
  • Does not work with electric baseboard heat (120-240-Volt)
  • How to choose the right thermostat for your home
  • Click here for more information on Electronic Recycling Programs

Info & Guides

You will need Adobe® Acrobat® Reader to view PDF documents. Download a free copy from the Adobe Web site.

Specifications

Dimensions

Display height (in.)
1.5
Display width (in.)
2.5
Product Depth (in.)
1.5
Product Height (in.)
3.5
Product Width (in.)
5.75

Details

Battery Power Type
Alkaline
Battery Size
AA
Color Family
White
Operation Type
Digital
Returnable
90-Day
Shape
Rectangle
Thermostat Product Type
Non-Programmable Thermostat
Thermostat Shape
Rectangular
Thermostat Type
Heating and Cooling
Voltage (v)
24v
Voltage (volts)
24
Wattage (watts)
0.0

Warranty / Certifications

Certifications and Listings
No Certifications or Listings
Manufacturer Warranty
1 year limited warranty

Specifications

Dimensions

Display height (in.)
1.5
Display width (in.)
2.5
Product Depth (in.)
1.5
Product Height (in.)
3.5
Product Width (in.)
5.75

Details

Battery Power Type
Alkaline
Battery Size
AA
Color Family
White
Operation Type
Digital
Returnable
90-Day
Shape
Rectangle
Thermostat Product Type
Non-Programmable Thermostat
Thermostat Shape
Rectangular
Thermostat Type
Heating and Cooling
Voltage (v)
24v
Voltage (volts)
24
Wattage (watts)
0.0

Warranty / Certifications

Certifications and Listings
No Certifications or Listings
Manufacturer Warranty
1 year limited warranty

Questions & Answers

I presently have a TH5220D 1029 Thermostat and I hope this thermostat is the same one. It looks t...

I presently have a TH5220D 1029 Thermostat and I hope this thermostat is the same one. It looks to be the same one but there is no product or model number on this one.
Asked by: BigT
Bought this in Nov 2017 .Worked as expected. 2 AA batteries made the power supply replacement longer.
Answered by: Brad
Date published: 2018-01-18

How low can the temperature be set? Can it be set as low as 40'f? I'm looking for a thermostat fo...

How low can the temperature be set? Can it be set as low as 40'f? I'm looking for a thermostat for my garage.
Asked by: psstill
This model's range is: HEAT 40 degrees F to 90 degrees F; COOL 50 degrees F to 99 degrees F.
Answered by: GTA390
Date published: 2018-01-10

Will this thermostat control both heat and cool with having to switch

Older thermostats or standard ones have to be switched from heat to cool, depending on what you desire, if I read this right, if I set my house to maintain 70 degrees, then if it needs heat then heat comes on, if I need it to be cool then the air comes on, would that be correct, right now my wife turns the system off when we do not need air or heat, which my belief is to maintain temperature you need one or the other or both being determined by the system itself, I may be wrong but I believe its the best way to maintain the right climate in your home and will save on heating and air bills.
Asked by: Dale
The answer Joe gave is wrong. This stat can be set up for either auto or manual cool-to-heat switch over. It's also possible to adjust the temperature settings to provide a temperature separation between cooling and heating modes. That prevents the system from cycling back and forth prematurely which improves efficiency.
Answered by: MikeyJane
Date published: 2018-04-26

The existing thermostat is a 20 year old Carrier with 5 wires and no battery. Will the HoneyWell mod RTHI 3550 replace it?

Asked by: roy
Email to Honeywell with this question, I think the answer is Yes, but better if you ask them.
Answered by: Traveler
Date published: 2018-03-01
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Customer Reviews

Deluxe Digital Non-Programmable Heat/Cool Thermostat is rated 4.7 out of 5 by 97.
Rated 4 out of 5 by from Practical, but not perfect After years of struggle with the programmable thermostat, which you have to re-program - taking a long time - every time you changing from heat to cool or versa because it looses the inputs, - I did buy this unit. There are a few things you can program with this, which is unfortunately coded instead of plain English. Not a big deal, but you shall have the manual handy. For this shortcoming I am rating in one below perfect. It is a good product, easy to use and works good, much better than the so called energy sawing, programmable type of thermostat, since it is easy the change the temperature if you want to do so and it stays there. A big plus with this unit that you can use as a climate control, by setting the programming to automatically change between the heat and the A/C.
Date published: 2016-05-24
Rated 4 out of 5 by from Simple to use with extra large, well lit display. Pros: - Great for luddites or the elderly bec... Simple to use with extra large, well lit display. Pros: - Great for luddites or the elderly because of it's simplicity. - Buttons are intuitive, have a nice rubbery feel, and operate smoothly. - Back lit display easy to read and brighter than most. - During setup one can select between the 'auto cool-to-heat' or 'manual cool-to-heat' features. (The manual option may be more straight forward for the elderly to understand.) - Set up and installation documentation is very clearly written. - Battery replacement is easier than most others but not intuitive. Cons: - Display washes out if viewed from too much of an angle. - Back light doesn't stay on long enough for the elderly. - Back light switches on by touching any button BUT 'fan' function and 'system' function will change if those buttons are used to turn on light. (Not true with temp up/down buttons) Bottom line: Mom is 97 and loves it!
Date published: 2017-08-09
Rated 4 out of 5 by from Bought this for my mother, she is retired and it had large numbers and back lighting that she cou... Bought this for my mother, she is retired and it had large numbers and back lighting that she could see at night. since she is home 7 days there was no need for a programmable stat. It was easy to install and controls very accurately.
Date published: 2016-11-29
Rated 5 out of 5 by from This is a good looking thermostat, especially compared to the old mechanical one it replaced. It ... This is a good looking thermostat, especially compared to the old mechanical one it replaced. It lights up when a button is touched so you can see what changes you are making. I appreciated the detailed instructions, but I also appreciated that in my case with a conventional A/C and heater setup, no fancy programming was required. The included wire labels made wiring the new thermostat error free. It has been installed for about 3 weeks and is error free. I would purchase it again.
Date published: 2017-08-10
Rated 5 out of 5 by from Exceeded by far, all my expectations Ease of installation, and precision of unit function are exemplary!
Date published: 2015-08-18
Rated 5 out of 5 by from Very Simple Install There is nothing to installing this thermostat. Took 15 minutes, and that was because of the 5 minute coffee break. Works great, easy to operate, easy to set. If you have an air conditioner with a separate gas heater, once it is wired up, just turn on the breaker and set the temp. Easy as that.
Date published: 2016-03-29
Rated 4 out of 5 by from I bought this thermostat to replace the very complicated "smart"... I bought this thermostat to replace the very complicated "smart" programmable thermostat that was installed when I bought my house. This is exactly what I wanted! Just follow directions to install and works perfectly. Very easy to use.
Date published: 2017-09-08
Rated 5 out of 5 by from Great Thermostat Got this on a special daily deal from Home Depot and it does everything I need it to do. Installation was simple (1st time I ever did this). Moving from a non-digital to a digital thermostat really makes a difference.
Date published: 2015-08-04
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