PRO1 IAQ PRO1 T855iSH 8” Backlit Alternatives: 6 Similar Picks Compared
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You are looking at pro1 iaq pro1 t855ish 8 backlit alternatives to find a better fit for your home. The original PRO1 T855iSH offers a large 8-inch backlit display and supports both conventional and heat pump systems. It provides seven-day programming and includes a glow-in-the-dark button for readability in low light. However, its 5.25-inch square footprint may be too large for some wall spaces. You might also prefer a different brand or a smaller form factor for a cleaner look. Some users seek more advanced smart home integration than the basic Wi-Fi features provide. Others may need a thermostat for a mini-split system instead of a central HVAC unit.
We selected these 6 options because their technical specifications overlap with the PRO1 T855iSH. This list includes models that handle heat pumps and conventional systems with similar voltage requirements. You will find options with different display sizes, ranging from compact units to larger screens. Some picks offer broader smart home compatibility with Alexa or Google Home. Others focus on specific system stages or include essential adapters. This guide compares the core specs of each device to help you identify the right hardware for your installation needs.
Our top pick: PRO1 T855iSH 8-Inch WiFi Thermostat.
How these picks differ from the T855iSH
Honeywell Home T6 Pro Wi-Fi Thermostat
The Honeywell Home T6 Pro is smaller than the PRO1, measuring 4.06 inches square versus the PRO1's 5.25-inch square footprint. It retains Wi-Fi connectivity and supports 2H/2C conventional systems and heat pumps, similar to the original. You gain geofencing and app-based automation that the PRO1 lacks. The PRO1 offers a larger 8-inch backlit display and a glow button for visibility in low light. Choose the Honeywell if you prefer a compact design with smart home integration over a large physical interface. The PRO1 remains better for users who prioritize readability and manual control precision.
SASWELL Smart Wi-Fi Programmable Thermostat
The SASWELL thermostat focuses on multi-stage compatibility and voice control via Tuya and Alexa. It includes a C-wire adapter, which the PRO1 does not list. Both units support Wi-Fi and heat pump systems. The PRO1 features a large 8-inch backlit display and a glow-in-the-dark button for easy adjustments in any lighting. The SASWELL model lacks the large screen and physical glow feature. It is better suited for users with complex multi-stage heating systems who need voice commands. Pick the PRO1 if you want a clear, large display and straightforward programming without relying on third-party voice ecosystems.
Coiiwsei Programmable Heat Pump Thermostat
The Coiiwsei RTH725 is designed for basic 1H/1C conventional systems, whereas the PRO1 supports more complex 5H/3C heat pump setups. The Coiiwsei unit is smaller, weighing 6.4 ounces compared to the PRO1's 11.4 ounces. It lacks Wi-Fi connectivity, making it a non-smart option. The PRO1 provides app control, 7-day programming, and a large backlit display. Choose the Coiiwsei only if you have a simple conventional system and do not need remote access. The PRO1 is the superior choice for heat pump users or anyone requiring smart scheduling and a large, easy-to-read interface.
Mysa Smart Thermostat for Mini-Split AC and Heat Pumps
The Mysa thermostat is specialized for ductless mini-split systems, a category the PRO1 does not cover. The Mysa unit is larger, measuring 5.59 inches wide and 6.65 inches high. It supports Alexa, Google Home, and Apple HomeKit, offering broader smart home integration than the PRO1. The PRO1 is designed for standard 24V conventional and heat pump wiring. Choose the Mysa if you own a mini-split AC or heat pump. The PRO1 is better for traditional HVAC systems where you need a large display and simple Wi-Fi control without complex ecosystem requirements.
Google Nest Smart Wi-Fi Thermostat
The Google Nest Thermostat is smaller and lighter than the PRO1, weighing 4.96 ounces versus 11.4 ounces. It features a sand-colored design, while the PRO1 is white with a large 8-inch display. Both support Wi-Fi and programmable schedules. The Nest integrates with Google Home and Alexa for voice control, which the PRO1 does not explicitly list. The PRO1 offers a larger screen and glow button for better visibility. Choose the Nest if you want automated energy savings and deep smart home integration. The PRO1 is better for users who prefer a large, physical interface and do not need advanced monitoring features.
Quick picks
Our 7 picks
PRO1 T855iSH 8-Inch WiFi Thermostat
Best for: Heat pump users needing large display
- System Compatibility
- 2H/2C conventional, 5H/3C heat pump
- Voltage
- 24V
- Programmability
- 7-day programmable or non-programmable
- Connectivity
- WiFi
- Display Type
- 8" backlit display
- Dimensions
- 1.75 × 5.25 × 5.25 inches
View on Amazon: PRO1 T855iSH 8-Inch WiFi Thermostat Affiliate link
This PRO1 IAQ thermostat features an 8-inch backlit display with a glow button for clear visibility in low light. It connects via Wi-Fi and supports 7-day programming with auto changeover. The unit handles 2H/2C conventional systems and 5H/3C heat pumps. It offers precision control through adjustable cycles and room temperature calibration. You get hardwired 24V power with color-coded terminals for straightforward installation.
Pros
- Large 8-inch backlit display with glow button
- Wi-Fi connectivity for remote scheduling
- Supports 5H/3C heat pump systems
- Room temperature calibration and setpoint limits
- Universal sub-base for easy installation
Cons
- No mention of a mobile app for control
- No remote sensor included in specifications
- Requires professional wiring for 24V power
Good fit if
- You need a large, easy-to-read display
- You have a heat pump system
- You want 7-day programmable scheduling
Skip if
- You require app-based control
- You are looking for a battery-powered unit
- You have a mini-split system
Verdict: PRO1 IAQ T855iSH 8" Backlit Thermostat fits users who prioritize display readability and heat pump compatibility. It serves as a solid option for those who prefer physical controls over app management.
Honeywell Home T6 Pro Wi-Fi Thermostat
Best for: homes with 2H/2C systems and smart home users
- System Compatibility
- Up to 2 Heat/1 Cool HP, 2 Heat/2 Cool
- Wiring Requirement
- Hardwired - C-wire required
- Smart Home Compatibility
- Apple HomeKit, Amazon Alexa
- Programmability
- Geofencing, 7-day, 5-2, 5-1-1, 1-week
- Connectivity
- Wi-Fi
- Dimensions
- 5 × 2.3 × 6 inches
View on Amazon: Honeywell Home T6 Pro Wi-Fi Thermostat Affiliate link
The Honeywell Lyric T6 Pro is a Wi-Fi thermostat supporting up to 2 heat and 2 cool stages. It offers flexible scheduling with 7-day, 5-2, 5-1-1, and geofencing options. You can control it via Apple HomeKit or Amazon Alexa. The unit requires a C-wire for hardwired installation. Its compact 4-inch square design fits standard wall spaces. This model suits users seeking reliable smart integration without complex setup.
Pros
- Supports 2 Heat/2 Cool systems
- Integrates with Apple HomeKit and Amazon Alexa
- Includes geofencing for automatic scheduling
- Offers 7-day and 5-1-1 programming modes
Cons
- Requires a C-wire for installation
- No built-in display mentioned in data
- Limited to Wi-Fi connectivity only
Good fit if
- You need Alexa or HomeKit integration
- You have a 2H/2C system
- You want geofencing features
Skip if
- You lack a C-wire
- You need a display screen
- You prefer Bluetooth-only control
Verdict: The Honeywell Lyric T6 Pro Wi-Fi Thermostat is a solid choice for homes with 2H/2C systems and existing smart home ecosystems. It delivers essential automation through geofencing and app control without unnecessary complexity.
SASWELL Smart Wi-Fi Programmable Thermostat
Best for: multi-stage heat pump systems with voice control
- System Compatibility
- 3H/2C heat pump, conventional
- Wiring Requirement
- C-wire adapter included
- Smart Home Compatibility
- Tuya, Smart Life, Google Home, Alexa
- Programmability
- 7-day
- Display Type
- LED color touchscreen
- Connectivity
- Wi-Fi
View on Amazon: SASWELL Smart Wi-Fi Programmable Thermostat Affiliate link
The SASWELL Tuya Smart WiFi Thermostat supports 3H/2C heat pump and conventional systems. It features a 7-day programmable schedule and an LED color touchscreen. The unit includes a C-wire adapter for homes lacking one. You can control it via Tuya, Smart Life, Google Home, or Alexa. This model suits users needing multi-stage heating control with voice integration.
Pros
- Supports 3H/2C heat pump and conventional systems
- Includes C-wire adapter for easy installation
- Compatible with Tuya, Smart Life, Google Home, and Alexa
- 7-day programmable scheduling
Cons
- Uses Tuya ecosystem instead of proprietary app
- Lacks advanced air quality sensors
- Basic touchscreen interface without backlit display
Good fit if
- You need a thermostat for a 3H/2C heat pump
- You want voice control via Google Home or Alexa
- Your system lacks a C-wire
Skip if
- You require a proprietary brand app
- You need integrated air quality monitoring
- You prefer a backlit display
Verdict: The SASWELL Tuya Smart WiFi Thermostat offers robust multi-stage compatibility and voice control for users with complex heating systems. It is a practical solution for those who need a C-wire adapter included.
Google Nest Thermostat E Frosted Display
Best for: 24V systems with voice control needs
- System Compatibility
- 24V HVAC, heat pump, radiant
- Voltage
- 24V
- Smart Home Compatibility
- Alexa, Google Assistant
- Programmability
- Programmable
- Display Type
- Frosted display
- Connectivity
- Wi-Fi
View on Amazon: Google Nest Thermostat E Frosted Display Affiliate link
The Google Nest Thermostat E (T4000ES) is a 24V smart thermostat with a frosted, low-glare display. It connects via Wi-Fi and works with Alexa and Google Assistant. You can control it through the Nest app to set schedules and view Energy History. It supports most 24V HVAC systems, including heat pumps and radiant heating. This model offers programmable control with energy-saving features like Eco Temperatures and Home/Away Assist.
Pros
- Frosted, low-glare display blends with décor
- Works with Alexa and Google Assistant
- Eco Temperatures and Home/Away Assist features
- ENERGY STAR certified for efficiency
Cons
- Limited to 24V HVAC systems only
- No mention of physical remote control included
- Display is frosted, not high-resolution LCD
Good fit if
- You want a smart thermostat with Alexa or Google Assistant support
- You have a 24V HVAC system including heat pump or radiant
- You prefer a minimalist, frosted display design
Skip if
- You need compatibility with non-24V systems
- You require a high-resolution digital display
- You want a thermostat without app control
Verdict: Google Nest Thermostat E is a practical option for users with 24V systems who value energy history tracking and voice assistant integration. It suits those who prefer a subtle display and automated scheduling over manual precision.
Coiiwsei Programmable Heat Pump Thermostat
Best for: Basic 1H/1C conventional system control
- System Compatibility
- 2H/1C heat pump, 1H/1C conventional
- Programmability
- 7-day, 5/1/1
- Display Type
- Backlight LCD
- System Stages
- 1 Heat / 1 Cool
- Dimensions
- 1.02 × 5 × 3.82 inches
- Weight
- 6.4 ounces
View on Amazon: Coiiwsei Programmable Heat Pump Thermostat Affiliate link
The Coiiwsei RTH725 is a 7-day programmable thermostat with a backlit LCD display. It supports 2 heat/1 cool heat pump or 1 heat/1 cool conventional systems. The unit measures 5.00 inches deep, 3.82 inches wide, and weighs 6.4 ounces. You get flexible programming menus and large terminal blocks for installation. This white unit suits users who need reliable, straightforward climate control without smart features.
Pros
- Supports 2H/1C heat pump and 1H/1C conventional systems
- 7-day, 5/1/1 flexible programming
- Backlit LCD display for clear reading
- Large terminal blocks for easy installation
Cons
- No Wi-Fi connectivity for remote control
- Not compatible with mini-split or line voltage systems
- No smart home integration or app access
Good fit if
- You have a 1H/1C conventional system
- You want a 7-day programmable thermostat
- You prefer a backlit LCD display
Skip if
- You need Wi-Fi connectivity
- You have a mini-split system
- You require smart home integration
Verdict: Coiiwsei RTH725 Backlit Thermostat fits users with conventional systems who want reliable programming. It lacks modern smart features but offers clear controls.
Mysa Smart Thermostat for Mini-Split AC and Heat Pumps
Best for: mini-split heat pump owners
- System Compatibility
- Mini-Split Heat Pumps & AC
- Smart Home Compatibility
- HomeKit, Alexa, Google Home
- Programmability
- Wi-Fi Programmable
- Connectivity
- 2.4 GHz Wi-Fi
- Application
- Air Conditioners
- Dimensions
- 2.87 × 5.59 × 6.65 inches
View on Amazon: Mysa Smart Thermostat for Mini-Split AC and Heat Pumps Affiliate link
This Mysa unit replaces the wall-mounted remote for mini-split heat pumps and air conditioners. It connects via 2.4 GHz Wi-Fi and works with Apple HomeKit, Alexa, and Google Home. You can control heating and cooling schedules from your phone. The device includes geofencing and climate alerts. It fits homes with ductless mini-split systems rather than central HVAC.
Pros
- Replaces mini-split wall remotes
- Works with Apple HomeKit, Alexa, and Google Home
- Includes geofencing and scheduling features
- Connects via 2.4 GHz Wi-Fi
Cons
- Limited to mini-split heat pumps and AC units
- Requires 2.4 GHz Wi-Fi network
- No physical thermostat display included
Good fit if
- You own a mini-split heat pump system
- You want to control your AC via Apple HomeKit
- You prefer using an app over a wall display
Skip if
- You have a central HVAC system
- You need a 5 GHz Wi-Fi connection only
- You want a traditional wall-mounted thermostat
Verdict: Mysa Mini-Split Smart Thermostat is a practical controller for ductless mini-split systems. It suits users who want app-based control and smart home integration for their specific AC unit.
Google Nest Smart Wi-Fi Thermostat
Best for: Google ecosystem users wanting HVAC monitoring
- Wiring Requirement
- Works without C wire in most homes
- Smart Home Compatibility
- Google Assistant, Matter
- Programmability
- Programmable
- Connectivity
- Wi-Fi
- Dimensions
- 3.31 × 3.31 × 1.07 inches
- Weight
- 4.96 ounces
View on Amazon: Google Nest Smart Wi-Fi Thermostat Affiliate link
The Google Nest Thermostat is a Wi-Fi enabled, programmable smart thermostat designed for home energy efficiency. It features HVAC monitoring to alert you to system issues and works without a C wire in most homes. You can control it via the Google Home app on iOS or Android. It supports voice commands through Google Assistant and Matter-certified assistants. The unit measures 3.31 by 3.31 by 1.07 inches and weighs 4.96 ounces.
Pros
- Works without a C wire in most homes
- Includes HVAC monitoring for system alerts
- Compatible with Google Assistant and Matter
- Savings Finder suggests schedule tweaks
Cons
- Requires Google Home app for full control
- Not compatible with all HVAC systems
- No display for local temperature viewing
Good fit if
- You want HVAC system health monitoring
- You use Google Assistant or Matter devices
- You prefer app-based schedule management
Skip if
- You need a C wire for your system
- You prefer local manual controls only
- You use Alexa or Apple Home exclusively
Verdict: Google Nest Thermostat Sand suits users who want automated energy savings and system monitoring via the Google Home app. It fits homes with compatible Wi-Fi and smart assistants.
Specifications side by side
| Spec | PRO1 T855iSH 8-Inch WiFi Thermostat | Honeywell Home T6 Pro Wi-Fi Thermostat | SASWELL Smart Wi-Fi Programmable Thermostat | Google Nest Thermostat E Frosted Display | Coiiwsei Programmable Heat Pump Thermostat | Mysa Smart Thermostat for Mini-Split AC and Heat Pumps | Google Nest Smart Wi-Fi Thermostat |
|---|---|---|---|---|---|---|---|
| System Compatibility | 2H/2C conventional, 5H/3C heat pump | Up to 2 Heat/1 Cool HP, 2 Heat/2 Cool | 3H/2C heat pump, conventional | 24V HVAC, heat pump, radiant | 2H/1C heat pump, 1H/1C conventional | Mini-Split Heat Pumps & AC | not stated |
| Voltage | 24V | not stated | not stated | 24V | not stated | not stated | not stated |
| Wiring Requirement | not stated | Hardwired - C-wire required | C-wire adapter included | not stated | not stated | not stated | Works without C wire in most homes |
| Smart Home Compatibility | not stated | Apple HomeKit, Amazon Alexa | Tuya, Smart Life, Google Home, Alexa | Alexa, Google Assistant | not stated | HomeKit, Alexa, Google Home | Google Assistant, Matter |
| Programmability | 7-day programmable or non-programmable | Geofencing, 7-day, 5-2, 5-1-1, 1-week | 7-day | Programmable | 7-day, 5/1/1 | Wi-Fi Programmable | Programmable |
| Connectivity | WiFi | not stated | not stated | not stated | not stated | 2.4 GHz Wi-Fi | not stated |
| Display Type | 8" backlit display | not stated | LED color touchscreen | Frosted display | Backlight LCD | not stated | not stated |
| System Stages | not stated | 2 Heat / 2 Cool | not stated | not stated | 1 Heat / 1 Cool | not stated | not stated |
| Application | not stated | not stated | not stated | not stated | not stated | Air Conditioners | not stated |
| Dimensions | 1.75 × 5.25 × 5.25 inches | 5 × 2.3 × 6 inches | not stated | not stated | 1.02 × 5 × 3.82 inches | 2.87 × 5.59 × 6.65 inches | 3.31 × 3.31 × 1.07 inches |
| Weight | 11.4 ounces | 12 ounces | not stated | 13 ounces | 6.4 ounces | 9.88 ounces | 4.96 ounces |
| Color | White | White | White | White | White | White | Sand |
| Model | T855iSH | TH6220WF2006 | T29UTW-7-WIFI(TY) | T4001ES-Bulk | RTH725-White | MYSA AC V1-0 INT | GA02082-US |
| Size | not stated | 4.06 inches square | not stated | not stated | 5.00"D x 3.82"W x 1.02"H | Mysa AC V1-0 | 1.07 x 3.31 x 3.31 Inches |
Frequently asked questions
Which alternative supports the most heating and cooling stages?
The Honeywell Home T6 Pro supports two heat and two cool stages. This makes it suitable for larger homes or complex systems that require multiple zones. Other options like the Coiiwsei model are limited to one heat and one cool stage, which fits only basic conventional setups.
Can I use these thermostats with voice assistants?
Several models support voice control. The SASWELL thermostat works with Alexa and Tuya. The Mysa unit connects to Alexa, Google Home, and Apple HomeKit. The Google Nest Thermostat E integrates with Alexa, allowing you to adjust temperatures using voice commands through your preferred smart home platform.
Are there options for mini-split air conditioning systems?
Yes, the Mysa Smart Thermostat is designed specifically for mini-split heat pumps and ductless air conditioners. It provides app-based control and integrates with major smart home ecosystems. Most other listed models are built for conventional wiring or standard heat pump systems, not ductless units.
Which thermostat has the smallest physical footprint?
The Google Nest Smart Wi-Fi Thermostat has a compact design measuring 3.31 inches wide and 1.07 inches high. It is significantly smaller than the PRO1 T855iSH, which measures 5.25 inches square. The Honeywell T6 Pro is also relatively small at 4.06 inches square.
Do any alternatives include a C-wire adapter?
The SASWELL Smart Wi-Fi Programmable Thermostat includes a C-wire adapter in the package. This helps if your existing thermostat wiring lacks a common wire. The product data does not confirm if other listed models include this accessory, so you should check their packaging details separately.
Which model is best for users who prefer physical controls?
The Coiiwsei Programmable Heat Pump Thermostat is a practical choice for those who want reliable physical controls. It lacks advanced smart features but offers clear, manual programming. The PRO1 T855iSH also serves users who prefer physical interaction, though it includes Wi-Fi connectivity for remote access.
Is there a budget-friendly option with energy tracking?
The Google Nest Thermostat E is listed as the best budget pick. It tracks energy history and provides automated scheduling. This feature helps you monitor usage without needing manual precision. It operates on 24V systems and integrates with voice assistants for convenient control.