The Ultimate DIY Guide to Heat Pump Thermostat with Humidity Control

When it comes to managing the temperature and humidity levels in your home, a heat pump thermostat with humidity control can be a game-changer. This comprehensive guide will provide you with the technical expertise and step-by-step instructions to help you navigate the world of heat pump thermostats with humidity control, empowering you to take control of your indoor climate as a DIY enthusiast.

Understanding Heat Pump Thermostat with Humidity Control

A heat pump thermostat with humidity control is a specialized device that not only regulates the temperature in your home but also actively manages the humidity levels. This advanced feature allows you to maintain a comfortable and healthy indoor environment, preventing issues like mold, mildew, and respiratory problems that can arise from excessive or insufficient humidity.

Key Features of a Heat Pump Thermostat with Humidity Control

  1. Humidity Sensing: The thermostat is equipped with a humidity sensor that continuously monitors the moisture content in the air, providing accurate readings.
  2. Humidity Control: The thermostat can control both humidification and dehumidification systems, allowing you to maintain the ideal humidity range (typically between 30-50%) for your home.
  3. Programmable Humidity Setpoints: You can set specific humidity targets for different times of the day or week, ensuring optimal comfort and energy efficiency.
  4. Integrated Temperature and Humidity Control: The thermostat seamlessly coordinates the heat pump’s operation with the humidifier or dehumidifier, ensuring a balanced and comfortable indoor environment.
  5. WiFi Connectivity: Many modern heat pump thermostats with humidity control feature WiFi connectivity, allowing you to monitor and adjust the settings remotely using a smartphone or tablet.

Compatibility and Technical Specifications

When selecting a heat pump thermostat with humidity control, it’s crucial to ensure compatibility with your existing HVAC system and humidity control equipment. Here are the key technical specifications to consider:

Heat Pump Compatibility

  • Ensure the thermostat is compatible with your heat pump model, with the necessary connections for O/B or W1/W2 wiring.
  • Check if the thermostat supports auxiliary heat, emergency heat, and other heat pump-specific features.
  • Verify that the thermostat can handle the voltage and amperage requirements of your heat pump system.

Humidity Control Connections

  • Look for a thermostat with dedicated humidity control connections, such as HUM (humidifier) and DHUM (dehumidifier) terminals.
  • Ensure the thermostat can integrate with your existing humidifier and/or dehumidifier, either directly or through compatible accessories.
  • Understand the control capabilities, such as the ability to control the humidity level, fan speed, and on/off operation of the humidity equipment.

Programmable Features

  • Seek a thermostat with advanced programmable features, including the ability to set custom temperature and humidity schedules.
  • Look for options that offer automatic humidity adjustments based on outdoor conditions or user preferences.
  • Ensure the thermostat has the necessary memory and processing power to handle complex programming and algorithms.

WiFi and Smart Home Integration

  • For enhanced convenience and remote access, choose a thermostat with WiFi connectivity and compatible with smart home platforms like Amazon Alexa, Google Assistant, or Apple HomeKit.
  • Verify the thermostat’s mobile app functionality, allowing you to monitor and control the system from your smartphone or tablet.
  • Consider features like geofencing, which can automatically adjust the temperature and humidity based on your location.

Installation and Wiring Compatibility

  • Ensure the thermostat is compatible with your existing HVAC wiring and can be easily installed without major modifications.
  • Look for clear installation instructions and support for common wiring configurations, including heat pumps with auxiliary heat, humidifiers, and dehumidifiers.
  • Consider the thermostat’s physical dimensions and whether it will fit seamlessly in your current wall space.

Selecting the Right Heat Pump Thermostat with Humidity Control

Now that you understand the key features and technical specifications, let’s explore some of the top heat pump thermostat with humidity control options on the market:

Carrier Thermostats with Humidity Control

Carrier, a leading HVAC manufacturer, offers a range of thermostats that are specifically designed to work with their heat pump systems and provide advanced humidity control. Some notable Carrier options include:

  • Carrier Côr® WiFi Thermostat: This smart thermostat features built-in humidity control, programmable schedules, and remote access via a mobile app.
  • Carrier Infinity® Touch Control: A high-end thermostat with a large touchscreen display, precise humidity control, and integration with Carrier’s Infinity HVAC systems.

Honeywell Thermostats with Humidity Control

Honeywell is a renowned brand in the thermostat industry, offering a variety of models that cater to heat pump systems and humidity management:

  • Honeywell T6 Pro Smart Thermostat: This WiFi-enabled thermostat provides precise humidity control, automatic adjustments, and integration with smart home platforms.
  • Honeywell T9 Smart Thermostat: A feature-rich option with remote sensor capabilities, humidity control, and advanced scheduling options.

Ecobee Thermostats with Humidity Control

Ecobee is a leading manufacturer of smart thermostats, and their lineup includes models that excel in heat pump and humidity control:

  • Ecobee SmartThermostat with Voice Control: This premium thermostat offers precise humidity management, voice control, and integration with smart home ecosystems.
  • Ecobee3 Lite Smart Thermostat: A more affordable option that still provides reliable humidity control and remote access through a mobile app.

AprilAire Thermostats

AprilAire is a specialist in indoor air quality solutions, and their thermostats are designed to work seamlessly with their humidifiers and dehumidifiers:

  • AprilAire Thermostat Model 8620: A comprehensive thermostat that offers precise humidity control, advanced programming, and integration with AprilAire’s whole-home air quality systems.
  • AprilAire Thermostat Model 8910: A high-end option with a large touchscreen display, remote access, and the ability to control multiple zones for optimal humidity management.

Installation and Setup

Installing a heat pump thermostat with humidity control may require a bit more effort than a standard thermostat, but with the right tools and guidance, it’s a manageable DIY project. Here’s a step-by-step guide to help you through the process:


  1. Gather the necessary tools: screwdrivers, wire strippers, level, and a voltage tester.
  2. Identify the existing thermostat wiring and make note of the terminal connections.
  3. Ensure you have access to the humidifier and/or dehumidifier wiring and connections.
  4. Review the manufacturer’s installation instructions thoroughly and familiarize yourself with the specific steps for your chosen thermostat model.

Thermostat Removal and Installation

  1. Turn off power to the HVAC system at the circuit breaker.
  2. Remove the existing thermostat, taking care to label the wires for easy reconnection.
  3. Mount the new thermostat base securely on the wall, ensuring it’s level and centered.
  4. Connect the wires to the appropriate terminals on the thermostat, following the manufacturer’s wiring diagram.
  5. Carefully tuck any excess wiring back into the wall opening.
  6. Attach the thermostat cover and secure it in place.

Humidity Control Integration

  1. Locate the humidifier and/or dehumidifier connections, and identify the appropriate terminals on the thermostat for these devices.
  2. Connect the humidifier and/or dehumidifier wires to the designated HUM and DHUM terminals on the thermostat.
  3. Ensure the humidity control equipment is properly powered and functioning.
  4. Test the humidity control features by adjusting the setpoints and verifying the humidifier and/or dehumidifier respond accordingly.

Programming and Commissioning

  1. Follow the thermostat’s setup wizard or instructions to configure the temperature and humidity settings.
  2. Set custom schedules and preferences, such as temperature and humidity targets for different times of the day or week.
  3. Enable any smart home integration or remote access features, such as WiFi connectivity and mobile app control.
  4. Perform a final test to ensure the heat pump, humidifier, and dehumidifier are all working in harmony to maintain the desired indoor climate.

Remember, always refer to the manufacturer’s instructions and safety guidelines, and consider consulting a professional HVAC technician if you’re unsure about any aspect of the installation or setup process.


By following this comprehensive guide, you’ll be well on your way to mastering the installation and operation of a heat pump thermostat with humidity control. This advanced technology will empower you to create a comfortable, healthy, and energy-efficient indoor environment, all while giving you the satisfaction of a successful DIY project. Embrace the technical details, follow the step-by-step instructions, and enjoy the benefits of precise temperature and humidity control in your home.