In-Depth Product Guide

Ductless HRV and ERVs - Breathe New Air into Your Home

By Luke Hunter, Guest Writer

Last Updated: Oct 4, 2024

We all need fresh air. But energy-efficient homes are built to be airtight. So - how can you get the fresh air you need while keeping your energy bills low? A heat recovery ventilator or an energy recovery ventilator (HRV/ERV) is critical. These have become vital components for efficient homes. Suppose you are renovating an older home, making it more efficient and airtight. In that case, you should consider the addition of an HRV or ERV.

What Is A Ductless HRV or ERV?
What Are Use Cases for Ductless Energy Recovery and Heat Recovery Ventilators?
What Are The Differences Between An ERV and HRV?
Do Ductless ERVs and HRVs Improve Indoor Air Quality?
Can I Run an ERV or HRV Year-Round?
Will an ERV or HRV Help Reduce Odors in My Home?
How Often Do I Need to Change the Filters in an ERV or HRV?
Are ERVs and HRVs Noisy?
Can an ERV or HRV Reduce Condensation and Mold Growth?
Is Professional Installation Required for Ductless ERVs or HRVs?
How Do ERVs and HRVs Affect My Energy Bills?
How Do I Choose Between an ERV and HRV for My Home?
How Much Do Ductless HRVs and ERVs Cost?
Who Makes Ductless HRVs and ERVs?

Heat and Energy Recovery Ventilators: Going Ductless

Most HRV and ERV systems use ducts to bring the exhaust air to the central heat-exchange unit and send the fresh air back through the building. They also have separate vents to bring in fresh outside air and send out stale exhaust air. That's a lot of ducts!

What if you don't have room for all those ducts or don't want them? There is a solution – the ductless heat recovery ventilator.

What Is A Ductless HRV or ERV?

A ductless HRV (Heat Recovery Ventilator) or ERV (Energy Recovery Ventilator) is a ventilation system that provides fresh air to your home without the need for an extensive ductwork system. These units work by exchanging stale indoor air with fresh outdoor air while recovering heat (in the case of HRVs) or both heat and moisture (in the case of ERVs) from the outgoing air. This process helps maintain indoor air quality and energy efficiency in homes, particularly in spaces where installing traditional ductwork is impractical.

What Are Use Cases for Ductless Energy Recovery and Heat Recovery Ventilators?

Ductless Energy Recovery Ventilators (ERVs) and Heat Recovery Ventilators (HRVs) are versatile solutions that provide efficient ventilation while maintaining energy efficiency. Below are some specific use cases where these systems shine:

1. Urban Living

In densely populated urban areas, space can be limited, and installing traditional ductwork is often impractical or impossible. Ductless ERVs and HRVs are ideal for apartments, condos, and high-rise buildings where adding full HVAC ducting isn’t an option. These systems require minimal space and allow urban dwellers to maintain indoor air quality without sacrificing energy efficiency.

2. Retrofitting Older Homes

Older homes often lack proper ventilation, especially those built before modern energy codes were established. Retrofitting these homes with a ductless ERV or HRV system offers an efficient way to introduce controlled, balanced ventilation without the hassle and cost of extensive renovations. These units can be easily installed in existing walls or ceilings, providing an energy-efficient way to improve indoor air quality while reducing moisture and humidity issues commonly found in older homes.

3. Small Commercial Spaces

Ductless ERVs and HRVs are not just for residential use; they are also highly beneficial in small commercial environments like offices, shops, and classrooms. In spaces where air quality is essential for comfort and productivity, these systems help maintain a constant flow of fresh air while minimizing energy consumption. Schools, in particular, benefit from the balanced ventilation provided by these systems, which can help create a healthier learning environment by reducing airborne contaminants.

4. Passive and Net-Zero Homes

For homeowners looking to build or retrofit their homes to meet passive house or net-zero standards, ductless ERVs and HRVs are key components in achieving optimal energy performance. These systems are designed to recover heat or energy from the air being ventilated out, making them essential in homes that prioritize energy conservation and sustainability.

By providing flexible, energy-efficient solutions for ventilation, ductless ERVs and HRVs serve a wide range of needs across different living environments, from modern urban apartments to energy-conscious passive homes.

What Are The Differences Between An ERV and HRV?

While both Energy Recovery Ventilators (ERVs) and Heat Recovery Ventilators (HRVs) provide balanced ventilation by exchanging indoor air with fresh outdoor air, they have distinct functionalities that make each suitable for different climates and specific needs. Below is a breakdown of the key differences to help homeowners and builders choose the right system.

1. Climate Suitability

One of the primary differences between ERVs and HRVs is their suitability for different climates:

ERVs are ideal for humid or temperate climates. They transfer both heat and moisture between the incoming and outgoing air, allowing them to retain humidity indoors during winter and reduce it during summer. This feature is particularly useful in humid climates, where excessive moisture can lead to mold and mildew.
HRVs, on the other hand, are better suited for colder, drier climates. They transfer only heat, making them efficient at recovering warmth during the winter months. However, they do not manage humidity, so they may not be the best choice in areas with high humidity levels or fluctuating seasons.

2. Humidity Control

ERVs have the added advantage of controlling indoor humidity, which can improve comfort and protect your home:

In the summer, ERVs reduce the amount of humid outdoor air entering the home, preventing excess moisture from building up indoors.
In the winter, they help retain some of the moisture indoors, preventing the air from becoming overly dry, which can cause discomfort, dry skin, and damage to wood floors and furniture.

HRVs, however, simply exchange warm indoor air with cooler outdoor air without altering the humidity levels, making them more effective in cold and dry environments but less suitable for managing humidity.

3. Energy Efficiency

Both ERVs and HRVs are designed to improve energy efficiency, but they do so in slightly different ways:

ERVs transfer both heat and moisture, which means less energy is needed to maintain comfortable indoor temperatures and humidity levels. This can be particularly beneficial in climates with high humidity.
HRVs focus solely on heat transfer, making them incredibly efficient in cold climates where the primary concern is conserving heat. They prevent the loss of warm air while bringing in fresh air, ensuring that your heating system doesn’t need to work overtime.

4. Installation Complexity

In terms of installation, both systems are relatively straightforward for professionals, but there are a few factors to consider:

ERVs might require more attention to moisture management, as the system will be handling not only heat exchange but also the movement of humidity. This can slightly increase installation complexity, particularly in areas where mold and condensation are concerns.
HRVs, on the other hand, are generally simpler to install in cold climates, where humidity levels are less of a concern.

5. Maintenance Requirements

Both ERVs and HRVs require regular maintenance to function efficiently, but there are some differences:

ERVs: In addition to regular filter changes, ERVs need to have their moisture transfer cores inspected and cleaned to ensure efficient operation.
HRVs: Maintenance for HRVs focuses more on cleaning the heat exchange core and checking for any buildup of dust or debris, which can hinder performance.

6. Cost Considerations

The costs of purchasing and installing an ERV or HRV vary depending on the size of your home, the complexity of installation, and the brand. However, there are a few general trends:

ERVs tend to be slightly more expensive than HRVs due to their ability to manage both heat and humidity. However, in regions where humidity control is critical, the added cost can be offset by savings on heating, cooling, and moisture management over time.
HRVs may have a lower upfront cost but are best suited for homes where heat recovery is the priority, such as colder climates.

7. Choosing the Right System for Your Home

When choosing between an ERV or HRV, consider the following factors:

Climate: If you live in a region with high humidity, an ERV is likely the better option. In colder, drier climates, an HRV will perform more efficiently.
Indoor Comfort: If maintaining a stable indoor humidity level is important for your comfort or home preservation (such as preventing wood damage), an ERV will provide more benefits.
Energy Efficiency: Both systems improve energy efficiency, but the specific savings will depend on your climate and ventilation needs. If your priority is preventing heat loss in the winter, an HRV might offer better energy savings.

By understanding these differences, you can choose the system that best suits your home’s unique climate and indoor air quality needs. Whether you opt for an ERV or HRV, both systems offer valuable solutions to improve ventilation while maintaining energy efficiency.

Do Ductless ERVs and HRVs Improve Indoor Air Quality?

Indoor air quality (IAQ) has become an increasing concern for homeowners, especially as homes are built or retrofitted to be more energy-efficient, resulting in less natural air exchange. Both ductless Energy Recovery Ventilators (ERVs) and Heat Recovery Ventilators (HRVs) play a crucial role in maintaining high IAQ by continuously supplying fresh outdoor air while recovering heat or energy from the outgoing air. Here’s how these systems help enhance indoor air quality in your home:

1. Removal of Indoor Pollutants

Modern homes are often tightly sealed to increase energy efficiency, but this can trap harmful indoor pollutants, such as volatile organic compounds (VOCs), carbon dioxide (CO2), and other contaminants. Ductless ERVs and HRVs help remove these pollutants by:

Continuous Ventilation: These systems constantly introduce fresh outdoor air into the home while expelling stale indoor air, ensuring that indoor pollutants don’t accumulate over time.
Reduction of VOCs: VOCs, emitted from household products such as paints, cleaning supplies, and furniture, are reduced as fresh air replaces contaminated air, leading to a healthier living environment.

2. Improved Humidity Control

Maintaining proper humidity levels is vital for both comfort and health. An environment that is too humid or too dry can lead to a host of problems, from discomfort to respiratory issues. Here’s how ERVs and HRVs can help:

ERVs: ERVs are particularly effective at managing humidity. In the summer, they prevent too much outdoor humidity from entering the home, and in the winter, they help retain indoor moisture, preventing overly dry conditions that can cause skin irritation, respiratory problems, and damage to wooden furniture or floors.
HRVs: While HRVs do not regulate humidity, they are highly efficient in cold, dry climates where the primary concern is heat retention. By providing consistent fresh air, HRVs help prevent air that’s too dry, which can be problematic in colder months.

3. Reduction of Allergens and Airborne Contaminants

For homeowners with allergies or asthma, maintaining high IAQ is essential. Ductless ERVs and HRVs reduce the concentration of airborne allergens and other contaminants, such as:

Pollen: These systems help limit the amount of pollen and other allergens entering your home by providing filtered ventilation that blocks larger particles from being circulated indoors.
Dust and Mold Spores: By balancing ventilation and humidity levels, ductless ERVs and HRVs can prevent the buildup of dust and mold spores, which thrive in unventilated or overly humid spaces. This helps reduce the risk of mold growth and improves air quality, benefiting occupants with allergies or respiratory conditions.

4. Regulation of CO2 Levels

In homes without proper ventilation, CO2 levels can rise quickly, particularly in bedrooms and living spaces where people spend a lot of time. Elevated CO2 levels can cause drowsiness, headaches, and reduced concentration. Ductless ERVs and HRVs continuously regulate indoor CO2 levels by:

Exchanging Stale Air: These systems ensure that the buildup of CO2 from breathing and household activities is constantly diluted with fresh outdoor air, creating a healthier and more breathable indoor environment.
Maintaining Optimal CO2 Levels: Whether you are using an ERV in a humid climate or an HRV in a colder one, these systems prevent the accumulation of CO2 and help maintain optimal levels for a healthier home.

5. Prevention of Mold and Mildew Growth

Poor ventilation and excess humidity are the perfect breeding grounds for mold and mildew, which can lead to health issues such as allergies, respiratory problems, and even more serious conditions for sensitive individuals. Ductless ERVs and HRVs are effective in:

Balancing Humidity Levels: By managing the humidity in your home, particularly in areas like basements, kitchens, and bathrooms, ERVs prevent the conditions that mold and mildew thrive in.
Providing Fresh Air to Moist Areas: HRVs are also effective in colder climates where mold can grow in poorly ventilated spaces. They ensure that moist air is properly vented outdoors, reducing the risk of mold formation in the home.

6. Enhanced Comfort and Overall Health

In addition to removing pollutants, managing humidity, and regulating CO2 levels, ductless ERVs and HRVs create a more comfortable living environment. They provide consistent ventilation without the need to open windows, which can invite unwanted outdoor pollutants, allergens, and noise. By improving IAQ, these systems contribute to better overall health for you and your family, reducing the risks of respiratory issues, allergies, and even the transmission of airborne diseases.

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Can I Run an ERV or HRV Year-Round?

Yes, both ERVs and HRVs can be used year-round. They are built to provide continuous ventilation in all seasons, either recovering heat or managing humidity depending on the model. HRVs are great for colder months, as they capture heat from the outgoing air, making them perfect for winter. However, they’re less effective at keeping your home cool in the summer. ERVs, on the other hand, work well in both hot and cold climates. They not only recover heat in the winter but also manage humidity during summer, making them ideal for areas with high humidity or changing seasons.

Will an ERV or HRV Help Reduce Odors in My Home?

Yes, both ERVs and HRVs can help reduce odors by constantly exchanging stale indoor air with fresh outdoor air. These systems remove cooking smells, pet odors, and general stale air by venting it out and bringing in clean air from outside. ERVs have the added benefit of managing moisture, which helps prevent odors caused by dampness, like those from mold or mildew.

How Often Do I Need to Change the Filters in an ERV or HRV?

You should aim to replace the filters in your ERV or HRV every 3 to 6 months, depending on factors like indoor air pollution, outdoor air quality, and system usage. It's important to follow the manufacturer’s guidelines for filter changes, as doing so helps maintain efficiency and ensure good air quality. In addition to replacing the filters, the heat or energy exchange core should be cleaned at least once a year to remove any dust or debris that could impact performance.

Are ERVs and HRVs Noisy?

No, both ductless ERVs and HRVs are designed to operate quietly. These systems are built for low-noise performance, so they won’t disrupt your living space. Since they don’t use extensive ductwork, the noise level is usually minimal and often quieter than traditional HVAC systems. However, where you install the unit can affect noise levels, so it's best to place it in a utility or mechanical room away from bedrooms or living areas for added comfort.

Can an ERV or HRV Reduce Condensation and Mold Growth?

Yes, while it's not their main purpose, both ERVs and HRVs can help reduce condensation and prevent mold by regulating indoor humidity levels. ERVs are especially effective at managing moisture, helping to prevent excess humidity that can lead to window condensation and mold in areas like basements and bathrooms. Although HRVs don’t control moisture, they still help prevent condensation by providing proper ventilation, which is particularly useful in colder climates where homes are often tightly sealed.

Is Professional Installation Required for Ductless ERVs or HRVs?

While ductless ERVs and HRVs are generally DIY-friendly, it's recommended to have a professional handle the installation, especially for hard-wired systems. A professional installer can make sure the unit is placed in the best location, properly connected to electrical systems, and that the intake and exhaust airflows are balanced for peak performance. Plus, many manufacturers require professional installation to keep the warranty valid, so DIY installation could risk voiding it and potentially lead to expensive repairs later on.

How Do ERVs and HRVs Affect My Energy Bills?

ERVs and HRVs are designed to boost your home's energy efficiency by recovering heat or energy from outgoing air. While they do use electricity, the savings from reducing the strain on your HVAC system often outweigh the operating costs. In colder climates, an HRV helps lower the energy needed to heat your home by capturing warmth from the exhaust air, while an ERV reduces the load on your air conditioning in hot, humid climates. Overall, the added electricity cost is minimal, especially when considering the improved efficiency of your heating and cooling systems.

How Do I Choose Between an ERV and HRV for My Home?

Choosing between an ERV and an HRV depends on factors like your local climate, humidity levels, and the specific needs of your home. ERVs are ideal for homes in areas with cold winters and humid summers because they manage both heat and moisture. On the other hand, HRVs are better suited for homes in colder, drier climates where the main goal is to recover heat during the winter. To make sure you pick the right system for your home, it’s a good idea to consult a professional who can assess your ventilation needs and recommend the best option.

How Much Do Ductless HRVs and ERVs Cost?

Given the specialized nature of these products, prices and availability seem to range widely. The Vento and the Cyclone can be found for just under $1,000. The Lunos is available in the US for just over $1,000. You'll find the Lunos between $1,400 to around $2,000, depending on which options you choose in Canada. Unfortunately, the Fresh-r line does not have a wide distribution in North America but sells for around 2,200 Euros overseas.

Who Makes Ductless HRVs and ERVs?

Several companies make ductless HRVs and ERVs including, Lunos, Vents, Cyclone and Fresh-r. We will provide short rundowns on each one below.

If your home needs ventilation, a ductless HRV could be an excellent choice for you, especially if you have limited space to install ducts. Apart from the energy savings they offer, ductless HRVs are designed to fit inconspicuously into your home, with their low profile and quiet operation. A great example of this is the container cottage that we featured previously on Rise. In a house made of containers, there was not much space for ducts in the rooms. The architect chose to go with ductless HRVs, and they love the results.

What Are The Differences Between An ERV and HRV?

1. Climate Suitability

One of the primary differences between ERVs and HRVs is their suitability for different climates:

ERVs are ideal for humid or temperate climates. They transfer both heat and moisture between the incoming and outgoing air, allowing them to retain humidity indoors during winter and reduce it during summer. This feature is particularly useful in humid climates, where excessive moisture can lead to mold and mildew.
HRVs, on the other hand, are better suited for colder, drier climates. They transfer only heat, making them efficient at recovering warmth during the winter months. However, they do not manage humidity, so they may not be the best choice in areas with high humidity levels or fluctuating seasons.

2. Humidity Control

ERVs have the added advantage of controlling indoor humidity, which can improve comfort and protect your home:

In the summer, ERVs reduce the amount of humid outdoor air entering the home, preventing excess moisture from building up indoors.
In the winter, they help retain some of the moisture indoors, preventing the air from becoming overly dry, which can cause discomfort, dry skin, and damage to wood floors and furniture.

3. Energy Efficiency

Both ERVs and HRVs are designed to improve energy efficiency, but they do so in slightly different ways:

ERVs transfer both heat and moisture, which means less energy is needed to maintain comfortable indoor temperatures and humidity levels. This can be particularly beneficial in climates with high humidity.
HRVs focus solely on heat transfer, making them incredibly efficient in cold climates where the primary concern is conserving heat. They prevent the loss of warm air while bringing in fresh air, ensuring that your heating system doesn’t need to work overtime.

4. Installation Complexity

In terms of installation, both systems are relatively straightforward for professionals, but there are a few factors to consider:

ERVs might require more attention to moisture management, as the system will be handling not only heat exchange but also the movement of humidity. This can slightly increase installation complexity, particularly in areas where mold and condensation are concerns.
HRVs, on the other hand, are generally simpler to install in cold climates, where humidity levels are less of a concern.

5. Maintenance Requirements

Both ERVs and HRVs require regular maintenance to function efficiently, but there are some differences:

ERVs: In addition to regular filter changes, ERVs need to have their moisture transfer cores inspected and cleaned to ensure efficient operation.
HRVs: Maintenance for HRVs focuses more on cleaning the heat exchange core and checking for any buildup of dust or debris, which can hinder performance.

6. Cost Considerations

The costs of purchasing and installing an ERV or HRV vary depending on the size of your home, the complexity of installation, and the brand. However, there are a few general trends:

ERVs tend to be slightly more expensive than HRVs due to their ability to manage both heat and humidity. However, in regions where humidity control is critical, the added cost can be offset by savings on heating, cooling, and moisture management over time.
HRVs may have a lower upfront cost but are best suited for homes where heat recovery is the priority, such as colder climates.

7. Choosing the Right System for Your Home

When choosing between an ERV or HRV, consider the following factors:

Climate: If you live in a region with high humidity, an ERV is likely the better option. In colder, drier climates, an HRV will perform more efficiently.
Indoor Comfort: If maintaining a stable indoor humidity level is important for your comfort or home preservation (such as preventing wood damage), an ERV will provide more benefits.
Energy Efficiency: Both systems improve energy efficiency, but the specific savings will depend on your climate and ventilation needs. If your priority is preventing heat loss in the winter, an HRV might offer better energy savings.

Ductless HRV and ERVs - Breathe New Air into Your Home

Table of Contents

What Is A Ductless HRV or ERV?

What Are Use Cases for Ductless Energy Recovery and Heat Recovery Ventilators?

1. Urban Living

2. Retrofitting Older Homes

3. Small Commercial Spaces

4. Passive and Net-Zero Homes

What Are The Differences Between An ERV and HRV?

1. Climate Suitability

2. Humidity Control

3. Energy Efficiency

4. Installation Complexity

5. Maintenance Requirements

6. Cost Considerations

7. Choosing the Right System for Your Home

Do Ductless ERVs and HRVs Improve Indoor Air Quality?

1. Removal of Indoor Pollutants

2. Improved Humidity Control

3. Reduction of Allergens and Airborne Contaminants

4. Regulation of CO2 Levels

5. Prevention of Mold and Mildew Growth

6. Enhanced Comfort and Overall Health

Ductless Ventilation Products on Rise

Vents TwinFresh Comfo RA1-50-2 Ductless Energy Recovery Ventilator

Vents TwinFresh Expert RA1-50-2 Ductless Energy Recovery Ventilator

Vents Solar Powered Ductless Fresh Air Wall Vent PSS 102

Vents TwinFresh Expert RW1-85-2 V.2 Ductless Energy Recovery Ventilator

Vents MERV 14 Filter for TwinFresh Expert RA1-50-2

Vents MERV 14 Filter for TwinFresh Comfo RA1-50-2

Vents MICRA 60 Single Room HRV

Vents MICRA 150 Single Room HRV

Vents TwinFresh Expert RW1-50-2 Wi-Fi Ductless Energy Recovery Ventilator

Vents Freshbox 100 White Mounting Kit

Can I Run an ERV or HRV Year-Round?

Will an ERV or HRV Help Reduce Odors in My Home?

How Often Do I Need to Change the Filters in an ERV or HRV?

Are ERVs and HRVs Noisy?

Can an ERV or HRV Reduce Condensation and Mold Growth?

Is Professional Installation Required for Ductless ERVs or HRVs?

How Do ERVs and HRVs Affect My Energy Bills?

How Do I Choose Between an ERV and HRV for My Home?

How Much Do Ductless HRVs and ERVs Cost?

Who Makes Ductless HRVs and ERVs?

What Are The Differences Between An ERV and HRV?

1. Climate Suitability

2. Humidity Control

3. Energy Efficiency

4. Installation Complexity

5. Maintenance Requirements

6. Cost Considerations

7. Choosing the Right System for Your Home

Do Ductless ERVs and HRVs Improve Indoor Air Quality?

1. Removal of Indoor Pollutants

2. Improved Humidity Control

3. Reduction of Allergens and Airborne Contaminants

4. Regulation of CO2 Levels

5. Prevention of Mold and Mildew Growth

6. Enhanced Comfort and Overall Health

Can I Run an ERV or HRV Year-Round?

Will an ERV or HRV Help Reduce Odors in My Home?

How Often Do I Need to Change the Filters in an ERV or HRV?

Are ERVs and HRVs Noisy?

Can an ERV or HRV Reduce Condensation and Mold Growth?

Is Professional Installation Required for Ductless ERVs or HRVs?

How Do ERVs and HRVs Affect My Energy Bills?

How Do I Choose Between an ERV and HRV for My Home?

How Much Do Ductless HRVs and ERVs Cost?

Who Makes Ductless HRVs and ERVs?

Ductless Ventilation Products on Rise

Vents TwinFresh Comfo RA1-50-2 Ductless Energy Recovery Ventilator

Vents TwinFresh Expert RA1-50-2 Ductless Energy Recovery Ventilator

Vents Solar Powered Ductless Fresh Air Wall Vent PSS 102

Vents TwinFresh Expert RW1-85-2 V.2 Ductless Energy Recovery Ventilator

Vents MERV 14 Filter for TwinFresh Expert RA1-50-2

Vents MERV 14 Filter for TwinFresh Comfo RA1-50-2

Vents MICRA 60 Single Room HRV

Vents MICRA 150 Single Room HRV

Vents TwinFresh Expert RW1-50-2 Wi-Fi Ductless Energy Recovery Ventilator

Vents Freshbox 100 White Mounting Kit