RFWEL Engineering is a leading provider of wireless control and telemetry solutions for building automation and HVAC (heating, ventilation, and air-conditioning) control. RFWEL helps IT and facility management teams solve complex challenges faced when trying to retrofit legacy systems with modern control solutions.
Our key strength is the ability to constitute engineering teams with varied expertise which becomes critical in addressing the HVAC control challenges. For example, RFWEL useful strengths include:
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![]() Wireless Communication |
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Remote wireless controls provide for energy efficiency and optimal temperature control in the most needed areas saving energy costs and providing for optimal comfort for building occupants.
Benefits of wireless HVAC controls include:
- Ease of installation and start-up coupled with advanced analysis which can be performed with more data.
- Enables flexibility and adaptability. Regular preventive maintenance tasks, such as inspections, can be greatly reduced via wireless sensors and data collection.
HVAC Control Systems Overview

One of the most common retrofit requests is the ability to control existing HVAC systems using a smartphone, tablet, or webpage. Building managers or homeowners are often interested in controlling and monitoring their HVAC systems from virtually anywhere in the world.
RFWEL HVAC control specialists have researched and cataloged the wireless HVAC control interfaces and the wireless HVAC remote controllers compatible with most major brands of HVAC indoor units. To find out what devices are compatible with your HVAC system see our HVAC Controls Filter or contact an RFWEL HVAC control specialist.


With legacy equipment, a gateway technology is necessary to bridge it and any other IT devices to connect to wireless IoT sensors such as occupancy sensors, duct smoke detectors, motion, pressure sensors, indoor air quality (IAQ) sensors, humidity, and temperature sensors.
Bus Protocol Conversion
Building Automation Systems (BASs) provide means to control as well as monitor various operational aspects of buildings. The most important and critical components of a BAS include sensors, actuators, and controllers.
BAS Communication Protocols are classified into two: proprietary and open protocols.
The Bus Lines below are used in interfacing various HVAC systems with central controllers and BMS systems.
Manufacturer | Bus Name |
Daikin | DIII-NET |
Sanyo | S Net |
Panasonic | P Net |
Toshiba | TCC Link |
Mitsubishi Electric | M Net |
LG | PI485 |
Mitsubishi Heavy Industries | Super Link / Super Link II |
Hitachi | H Link |
Samsung | Nasa Protocol |
Fujitsu | VRF Communication Line |
Use the table below to select your Wireless thermostat or sensor or contact us to discuss your HVAC control application. Our experienced team will custom-build your system using the best-in-class equipment and industry best-known-methods. We are a Licensed & Bonded Low-Voltage Wireless Communication contractor (Arizona ROC#322820) should you need installation assistance.
Compare HVAC Wireless Thermostats Specs | ||
Item | Key Specifications | Available at these Online Market Places |
Mitsubishi Electric MHK2 |
Connectivity: Wireless Built-In Heat/Cool Stages: 1 / 1 Remote Access: Yes |
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Trane XL824 (MPN: TCONT824AS52DBA) |
Connectivity: Wi-Fi Built-In, Ethernet Screen: Touchscreen, 4.3", Full Color, Lock Out Heat/Cool Stages: 5 / 2 Remote Access: Yes |
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Venstar T8850 |
Connectivity: Wi-Fi Built-In Screen: Full Color, Touchscreen Heat/Cool Stages: 4 / 2 Remote Access: Yes |
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Venstar T7900 |
Connectivity: Wireless Built-In Screen: Touchscreen, Full Color Heat/Cool Stages: 4 / 2 Remote Access: Yes |
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Trane XR724 (MPN: TCONT724AS42DAA) |
Connectivity: Wi-Fi Built-In, Ethernet Screen: Touchscreen, 4.3", Black & White, Lock Out Heat/Cool Stages: 4 / 2 Remote Access: Yes |
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Venstar T6900 |
Connectivity: Wi-Fi Built-In Screen: Full Color, Touchscreen Heat/Cool Stages: 4 / 2 Remote Access: Yes |
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Trane XL1050 (MPN: TZONE1050AC52ZA) |
Connectivity: Wi-Fi Built-In, Ethernet, Z-Wave Screen: 7", Full Color, Touchscreen, Lock Out Heat/Cool Stages: 5 / 2 |
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Venstar T8800 |
Screen: Full Color, Touchscreen Heat/Cool Stages: 4 / 2 |
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Trane XL850 (MPN: TCONT850AC52UA) |
Connectivity: Wi-Fi Built-In, Ethernet, Z-Wave Screen: 4.3", Full Color, Touchscreen, Lock Out Heat/Cool Stages: 5 / 2 |
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Venstar T2050 |
Connectivity: Wireless Built in Screen: Black & White Heat/Cool Stages: 2 / 2 Remote Access: Yes |
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Venstar T8900 |
Connectivity: Wi-Fi Built-In Screen: Full Color, Touchscreen Heat/Cool Stages: 4 / 2 |
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Venstar T7850 |
Connectivity: Wi-Fi Add-On Screen: Full Color, Touchscreen Heat/Cool Stages: 4 / 2 Remote Access: Yes |
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HVAC Wireless Control Interface
See table below or search for HVAC Wi-Fi Interface Controllers meeting specific requirements using:
HVAC Control Interface Filter:
Compare HVAC Wireless Interface Specs | ||
Item | Key Specifications | Available at these Online Market Places |
Mitsubishi Electric MIFH1 |
Type: Wireless Control Interface Wireless Protocol: Proprietary (FHSS) Frequency: 900 MHz (ISM) Compatible Brands: Mitsubishi Electric |
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Venstar ACC-VWF1 |
Type: Wi-Fi Control Interface Wireless Protocol: 802.11b, 802.11g, Wi-Fi 4 (802.11n) Frequency: 2.4 GHz Compatible Brands: Venstar |
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Fujitsu FJ-IR-WIFI-1NA |
Type: Wi-Fi Control Interface Wireless Protocol: Wi-Fi Frequency: 2.4 GHz Compatible Brands: Fujitsu |
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Mitsubishi Electric PAC-WHS01IE-E |
Type: Signal Extender Compatible Brands: Mitsubishi Electric |
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Fujitsu UTY-TFNXZ2 |
Type: Wi-Fi Control Interface Wireless Protocol: Wi-Fi Frequency: 2.4 GHz Compatible Brands: Fujitsu |
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Gree WSBEE03 |
Type: Wi-Fi Control Interface Wireless Protocol: Wi-Fi Frequency: 2.4 GHz Compatible Brands: Gree |
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Gree WSBEC02 |
Type: Wi-Fi Control Interface Wireless Protocol: Wi-Fi Frequency: 2.4 GHz Compatible Brands: Gree |
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LG PWFMDD200 |
Type: Wi-Fi Control Interface Wireless Protocol: Wi-Fi Frequency: 2.4 GHz Compatible Brands: LG |
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Mitsubishi Electric PAC-USWHS002-WF-2 |
Type: Wi-Fi Control Interface Wireless Protocol: 802.11b, 802.11g, Wi-Fi 4 (802.11n) Frequency: 2.4 GHz Compatible Brands: Mitsubishi Electric |
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Fujitsu FJ-RC-WIFI-1NA |
Type: Wi-Fi Control Interface Wireless Protocol: Wi-Fi Frequency: 2.4 GHz Compatible Brands: Fujitsu |
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HVAC Wireless Sensors
See table below or search for Wireless Temperature & Humidity Sensors meeting specific requirements using:
Compare HVAC Wireless Sensors Specs | ||
Item | Key Specifications | Available at these Online Market Places |
Mitsubishi Electric MOS1 |
Type: HVAC Temperature Sensor, HVAC Humidity Sensor Frequency: 900 MHz (ISM) Sense Range: -40 to 60 degC Compatible Brands: Mitsubishi Electric |
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Mitsubishi Electric PACUSWHS003TH1 (MPN: PAC-USWHS003-TH-1) |
Type: HVAC Temperature Sensor, HVAC Humidity Sensor Frequency: 2.4 GHz Sense Range: 0 to 40 degC Compatible Brands: Mitsubishi Electric |
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Venstar ACCTSENWIFI |
Type: HVAC Temperature Sensor Compatible Brands: Venstar |
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HVAC Control Interface Adapters
See table below or search for HVAC Interface Adapters, Protocol Converters, and Extenders meeting specific requirements using:
Compare HVAC Control Adapters Specs | ||
Item | Key Specifications | Available at these Online Market Places |
Mitsubishi Electric PAC-US444CN-1 |
Type: Thermostat Adapter Interface Compatible Brands: Nest, Honeywell, Lyric, Inncom |
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Mitsubishi Electric PAC-UKPRC001-CN-1 |
Type: Protocol Converter Compatible Brands: Mitsubishi Electric |
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Mitsubishi Electric PAC-WHS01HC-E |
Type: Equipment Controller Compatible Brands: Mitsubishi Electric |
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Samsung TADPT2 |
Type: Thermostat Adapter Interface Compatible Brands: Nest, Honeywell |
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Fujitsu UTY-TTRX |
Type: Thermostat Adapter Interface Compatible Brands: Honeywell, Nest |
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Fujitsu UTY-TTRX_VPL24-210 (MPN: UTY-TTRX+VPL24-210) |
Type: Thermostat Adapter Interface Compatible Brands: Honeywell, Nest |
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Mitsubishi Electric PAC-US444CN-1_VPL24-210 (MPN: PAC-US444CN-1+VPL24-210) |
Type: Thermostat Adapter Interface Compatible Brands: Nest, Honeywell, Lyric, Inncom |
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