Why My Nest Thermostat Blowing Cold Air On Heat?- [Easy Fix]

If your Nest thermostat blowing cold air on heat mode, it can be a frustrating issue, but it’s typically solvable. Start by checking thermostat settings, temperature settings, and the system mode to ensure they are correctly configured. Examine wiring, power sources, and filters to rule out common issues.

Keep your thermostat firmware updated and consider a restart or reset if necessary.

However, In this guide, we’ll explore the common heating problems that Nest thermostat users may encounter and, more importantly, we’ll provide you with quick and effective fixes to get your home cozy and comfortable again. 

Don’t let heating problems chill your home or your comfort. Let’s dive into the quick fixes that can help you regain control of your Nest thermostat and enjoy the warmth you deserve.

Table of Contents

Understand the Nest Thermostat

The Nest Thermostat is a smart and innovative device designed to enhance your home’s heating and cooling control while promoting energy efficiency. 

To effectively troubleshoot the issue of nest blowing cold air when heating mode is on, it’s crucial to have a clear understanding of how the Nest Thermostat operates and its key features:

1. How the Nest Thermostat Works

The Nest Thermostat is known for its learning capabilities, which enable it to adapt to your schedule and preferences over time. Here’s how it generally functions:

Learning Mode

The Nest Thermostat observes your temperature adjustments and schedules, eventually creating a personalized heating and cooling schedule for your home. 

It learns when you prefer higher or lower temperatures and when you’re typically away.


It uses built-in sensors, including temperature, humidity, and occupancy sensors, to gauge your home’s conditions accurately.

Wi-Fi Connectivity

The Nest Thermostat connects to your home’s Wi-Fi network, allowing you to control it remotely via a smartphone app and receive software updates.


It’s compatible with a wide range of heating, cooling, and HVAC systems, but compatibility can vary. It’s essential to ensure your specific system works with the Nest Thermostat.

2. Features and Benefits of the Nest Thermostat

The Nest Thermostat offers several features that set it apart from traditional thermostats:

Energy Savings

By learning your habits and optimizing temperature settings, the Nest Thermostat aims to reduce energy consumption and lower utility bills.

Remote Control

You can adjust your home’s temperature settings from anywhere using the Nest app on your smartphone or tablet.

Voice Control

Many Nest Thermostat models are compatible with voice assistants like Google Assistant and Amazon Alexa, enabling hands-free control.


 It integrates with other smart home devices and platforms, allowing for automation and creating a cohesive smart home ecosystem.

Energy Reports

The Nest Thermostat provides energy reports, giving you insights into your energy usage and ways to improve efficiency.

3. Common Heating and Cooling Modes

Understanding the different modes of the Nest Thermostat is vital for troubleshooting the issue of it blowing cold air during heating mode:

Heating Mode

This mode is activated when you want to raise the temperature in your home. It should blow warm air when in heating mode.

Cooling Mode

In contrast, cooling mode is used to lower the temperature and provide cool air. The thermostat should blow cool air during this mode.

Fan Mode

You can also set the thermostat to run the fan without heating or cooling. This can help distribute air throughout your home.

7 Causes for Nest Says Heating But Blowing Cold Air

Understanding the underlying causes behind a Nest thermostat’s unexpected behavior, such as nest heat blowing cold air, is essential to maintaining a comfortable and efficient home environment.

In this exploration, we’ll delve into the various factors that can lead to this issue, from thermostat settings to system compatibility, empowering you to diagnose and resolve the problem effectively.

1. Cold Air Instead of Heat

   – One of the most frustrating issues is when your Nest thermostat blows cold air while set to heat mode. This can leave you shivering in your own home, especially during colder months.

2. Inadequate Heating

   – You might find that your Nest thermostat struggles to reach the desired temperature or maintain consistent warmth throughout your home, leading to discomfort and energy inefficiency.

3. Temperature Inconsistencies

   – Another common problem is temperature inconsistencies, where some rooms feel too hot while others remain chilly. This can result in uneven comfort and wasted energy.

4. Delayed Heating Response

   – Some users experience delays in their Nest thermostats responding to temperature adjustments, causing frustration as they wait for the heating system to kick in.

5. Sudden Thermostat Restart

   – In some cases, Nest thermostats may restart unexpectedly, interrupting heating cycles and potentially causing temperature fluctuations.

6. Thermostat Not Following Schedule

   – If your thermostat isn’t adhering to the programmed schedule or isn’t responding to manual adjustments, it can disrupt your comfort and energy-saving efforts.

7. Unusual Error Messages

   – Occasionally, Nest thermostats may display error messages related to heating, which require troubleshooting to decipher and resolve.

Quick Fixes for Nest Thermostat Blowing Cold Air on Heat

Encountering heating issues with your Nest thermostat can be frustrating, but many problems have straightforward solutions. 

Below, we’ll guide you through quick fixes to get your Nest thermostat heating your home as it should:

1. Check Thermostat Settings

   – Start by verifying that your Nest thermostat is correctly set to “Heat” mode. Sometimes, accidental mode changes can result in cold air blowing instead of warm.

2. Inspect Wiring and Connections

   – Carefully examine the wiring and connections between your Nest thermostat and your HVAC system. Loose or damaged wires can disrupt heating. Ensure everything is securely connected.

3. Update Firmware and Software

   – Ensure that your Nest thermostat’s firmware and software are up to date. Outdated software can lead to performance issues. Check for updates in the Nest app.

4. Clean and Maintain Your Nest Thermostat

   – Dust and debris can accumulate over time, affecting the thermostat’s sensors and performance. Gently clean the device with a soft, dry cloth, and ensure it’s free of obstructions.

5. Reset the Thermostat

   – If issues persist, consider performing a factory reset on your Nest thermostat. This can often resolve persistent problems but should be done as a last resort since it erases your settings.

6. Check Compatibility with the HVAC System

   – Ensure that your Nest thermostat is compatible with your HVAC system. Incompatibility can lead to heating issues. Check Nest’s compatibility tool or consult with a professional.

7. Contact Nest Support

   – If you’ve exhausted these quick fixes and the problem persists, it’s time to reach out to Nest support. 

They can provide expert assistance and may recommend further troubleshooting steps or a replacement if needed.

10 Preventative Maintenance Tips for Nest Not Heating To Set Temperature

Preventing heating problems with your Nest thermostat is not only cost-effective but also ensures your home remains comfortable year-round. 

Here are some proactive measures to keep your thermostat and heating system in top shape:

1. Regularly Check and Clean

   – Make it a habit to inspect your Nest thermostat for dust or debris buildup. Cleaning it periodically with a soft, dry cloth can help maintain accurate temperature readings.

2. Change Air Filters

   – A clogged or dirty air filter can strain your HVAC system, leading to heating problems. Replace your air filters as recommended by the manufacturer or at least every few months.

3. Schedule Professional HVAC Maintenance

   – Consider an annual HVAC system checkup by a qualified technician. They can identify and address potential issues before they disrupt your heating.

4. Keep Vents and Registers Clear

   – Ensure that vents and registers in your home are unobstructed by furniture, curtains, or other items. Blocked vents can disrupt airflow and affect heating efficiency.

5. Monitor Temperature Settings

   – Be mindful of your Nest thermostat’s temperature settings. Extreme temperature fluctuations can strain the HVAC system. 

Opt for gradual adjustments to maintain a consistent and comfortable environment.

6. Check for Software Updates

   – Periodically check for software updates for your Nest thermostat. Keeping the software current can resolve bugs and improve overall performance.

7. Educate Household Members

   – Ensure everyone in your household understands how to use the Nest thermostat correctly. Misuse or constant temperature changes can affect heating efficiency.

8. Consider a Smart Thermostat Cover

   – If your thermostat is in a high-traffic area, consider using a cover or lock to prevent unauthorized adjustments.

9. Plan for Seasonal Changes

   – Before each heating season, review and update your thermostat’s schedule to align with your heating needs. This helps optimize energy use.

10. Invest in a Backup Heating Method

   – Consider having a backup heating method, like a space heater or electric blanket, in case of unexpected thermostat issues during cold weather.

Additional Tips for Nest Thermostat Heat Not Working Issue

To ensure a seamless experience with your Nest Thermostat and minimize the chances of it blowing cold air when in heating mode, consider these user tips and best practices:

Regular Maintenance

   1. Cleanliness

Keep the thermostat and its surrounding area clean from dust and debris. This prevents interference with sensors and maintains accurate readings.

   2. Battery Replacement

If your Nest Thermostat has a built-in battery, monitor its health and replace it as needed to prevent unexpected shutdowns.

Optimizing Temperature Settings

   1. Temperature Schedule

Take advantage of the Nest Thermostat’s scheduling feature. Create a temperature schedule that aligns with your daily routine to minimize manual adjustments.

   2. Temperature Range

 Avoid setting extreme temperature variations that could lead to the system working inefficiently or blowing cold air.

Checking Compatibility

   1. HVAC Compatibility

Before installation, ensure that your HVAC system is compatible with the Nest Thermostat. Incompatibilities can lead to erratic behavior.

   2. C-Wire Installation

If your system requires it, consider installing a C-wire (common wire) to provide continuous power to the thermostat. This can improve reliability.

Firmware Updates

   1. Regular Checkups

Periodically check for firmware and software updates for your Nest Thermostat. These updates often include bug fixes and performance enhancements.

   2. Automatic Updates

 Enable automatic updates to ensure your thermostat is always running the latest software.

Temperature Sensor Placement

   1. Avoid Direct Sunlight

Install the thermostat away from direct sunlight or heat sources to prevent inaccurate temperature readings.

   2. Obstructions

Ensure that the thermostat’s sensors are not obstructed by furniture or curtains, as this can affect its ability to gauge room temperature accurately.

Monitor Energy Usage

   1. Energy Reports

Regularly review the energy reports provided by your Nest Thermostat to identify opportunities for further energy savings.

Comparing Nest Thermostats with Other Smart Thermostats

Explore the world of smart thermostats, This comparison delves into the Nest Thermostats alongside other leading smart thermostat options.

Discover how these devices stack up in terms of features, performance, and energy efficiency to help you make an informed choice for your home climate control needs.

Google Nest Thermostat

The Google Nest Thermostat is a smart device that helps you control the temperature in your home easily. It learns your habits to keep you comfortable and saves energy. You can use an app or your voice to adjust it. It’s a great choice for a smart and efficient home.

1. Key Features

  • Learning capabilities for personalized schedules.
  • Integration with Google Assistant for voice control.
  • Energy-saving Eco Mode.

2. Pros

  • Well-established brand with a reputation for reliability.
  • Compatibility with a wide range of HVAC systems.
  • Competitive pricing for a smart thermostat.

3. Cons

  • Fewer advanced features compared to higher-end Nest models.
  • Limited compatibility with other voice assistants (less so if you’re in the Google ecosystem).

Ecobee SmartThermostat

The Ecobee smart thermostat is a cutting-edge home climate control device. It offers precise temperature regulation, energy savings, and compatibility with voice assistants like Amazon Alexa.

With its intuitive interface and remote control capabilities, it helps homeowners optimize their heating and cooling systems for comfort and efficiency.

1. Key Features

  • Room sensors for temperature balancing in multiple zones.
  • Built-in Alexa voice assistant for added convenience.
  • Compatibility with various HVAC systems, including radiant heating.

2. Pros

  • Enhanced room-by-room control with sensors.
  • Voice control and integration with other smart devices.
  • Energy-saving reports and insights.

3. Cons

  • Slightly higher initial cost.
  • Room sensors may require occasional battery replacement.

Honeywell Home T9 Thermostat

The Honeywell Home T9 Thermostat is a smart and versatile home climate control solution. It features remote temperature monitoring, flexible scheduling, and compatibility with popular voice assistants.

Its innovative room sensor technology, it ensures personalized comfort throughout your home, while also promoting energy efficiency.

1. Key Features

  • Room sensors for precise temperature control.
  • Geofencing technology for automatic adjustments when you leave or return home.
  • Compatibility with various smart home platforms.

2. Pros

  • The geofencing feature enhances energy savings.
  • Easy integration with existing smart home ecosystems.
  • User-friendly app for remote control.

3. Cons

  • Limited voice control options compared to some competitors.
  • May require a C-wire for installation in some cases.

Emerson Sensi Touch Smart Thermostat

The Emerson Sensi Touch Smart Thermostat combines sleek design with practicality. It offers easy app-based control, compatibility with popular voice assistants, and smart features like geofencing.

Its intuitive touchscreen interface makes home climate management efficient and convenient, all while helping to save on energy costs.

1. Key Features

  • User-friendly touchscreen interface.
  • Geofencing for energy savings.
  • Compatible with a wide range of HVAC systems.

2. Pros

  • Affordable pricing.
  • Straightforward installation and setup.
  • Extensive compatibility ensures broad usability.

3. Cons

  • Lacks some advanced features like room sensors.
  • Limited integration with voice assistants compared to top-tier competitors.

Frequently Asked Questions (FAQs)

Can a Nest thermostat work with all HVAC systems?

Nest thermostats are compatible with many HVAC systems, but not all. To ensure compatibility, use Nest’s online compatibility tool or consult with a professional HVAC technician.

How do I know if my Nest thermostat needs a software update?

Check for software updates in the Nest app. If an update is available, follow the prompts to install it. Keeping your thermostat’s software up to date can resolve performance issues.

What should I do if my Nest thermostat displays an error message?

Error messages can provide clues about the issue. Consult the Nest app or Nest’s official support resources for guidance on interpreting and resolving specific error messages.

Can I install a Nest thermostat myself, or do I need a professional?

Many users can install Nest thermostats themselves, thanks to their user-friendly design and step-by-step instructions. However, if you’re unsure or face compatibility issues, it’s wise to consult a professional HVAC technician.

What should I do if none of the quick fixes work, and my Nest thermostat still has heating problems?

If you’ve exhausted the quick fixes and heating issues persist, it’s best to contact Nest support. They can provide advanced troubleshooting steps or recommend a replacement if necessary.


In closing, resolving the issue of a nest thermostat blowing cold air on heat is crucial for maintaining a comfortable home environment. By identifying and addressing the root causes, you can ensure your heating system operates efficiently.

Whether through DIY troubleshooting or professional help, your pursuit of warmth and coziness during the heating season is well within reach.

Scott Maupin