An Energy Recovery Ventilator (ERV) improves indoor air quality by continuously exchanging stale indoor air with fresh outdoor air. ERVs transfer both heat and moisture, maintaining optimal humidity and reducing HVAC energy consumption by up to 50%. This makes them a superior choice for advanced home ventilation and room ventilation.
Most people spend the vast majority of their time indoors, yet the air trapped inside our homes and offices is rarely as clean as we assume. According to the U.S. Environmental Protection Agency (EPA), indoor air can be two to five times more polluted than outdoor air. Everyday activities like cooking, cleaning, and simply breathing cause moisture, carbon dioxide, and volatile organic compounds (VOCs) to accumulate. Without proper airflow, these trapped pollutants can lead to headaches, fatigue, and respiratory issues.
Upgrading your home ventilation is the most effective way to flush out these harmful contaminants. The International Energy Agency reports that proper mechanical ventilation can boost indoor air quality by up to 30%. However, opening a window or running a standard bathroom fan is no longer enough to meet modern health standards.
Modern building codes, along with health professionals, advocate the use of mechanical systems for managing indoor air quality, as long as the systems are energy efficient. By learning about the latest technologies in air ventilation, you are better equipped to assess the health, comfort, and energy cost implications of your property over time.
What is the difference between basic and advanced ventilation?
| Feature | Basic Ventilation | Advanced Ventilation |
|---|---|---|
| Primary Mechanism | Natural airflow with simple localized exhaust fans | Integrated mechanicals that control airflow |
| Air Control | Use of windows and exhaust fans (kitchen and bath) | Designed to keep an equilibrium of airflow |
| Filtration | No air filtration | Built-in filtration for pollutants from outdoor air |
| Temperature and Humidity | Does not regulate air temperature and humidity so outside air forces HVAC to work harder | Actively changes and controls temperature and humidity to keep consistent indoor climate |
| Air Movement | Can create strong and uncontrolled drafts | Steady and controlled air exchange without drafts |
| Energy Efficiency | Lower because of energy leaks that heating and cooling system has to work against | Higher because it controls exchange rates and reduces load on HVAC system |
What are ERVs and HRVs, and how do they differ?
| Feature | Heat Recovery Ventilator (HRV) | Energy Recovery Ventilator (ERV) |
|---|---|---|
| Core Function | Transfers heat only between streams | Transfers both heat and moisture |
| Winter Performance | Captures heat and loses indoor humidity which creates dry air | Transfers moisture back in to home, so air doesn’t become too dry |
| Summer Performance | Cools incoming air, doesn’t remove outdoor humidity | Removes some humidity from air before it gets to the house |
| Ideal For | Homes with too much moisture or heavy window condensation in the winter | Homes that feel too dry in winter and homes in humid climates |
| Primary Goal | Stale air removal, temperature regulation | Temperature, humidity (latent energy) regulation |
What do Energy Recovery Ventilators do to help with air quality?
Energy Recovery Ventilators improve the quality of air indoors as new air is led through a core that heats and cools and pushes the stale air that has been inside the building out. In the unit, the two streams that are air do not mix but instead cross streams and ERV does energy and moisture exchange.
The warm air and stale air that leaves the home has heat and humidity which is then used in the cold air that is entering the home, which is done in the winter. In the summer, the air that is cool must have heat and humidity removed and then must be included to keep the house cool and dry.
Using a system such as this has very beneficial effects. Both the drafts that are chilly and pollutants that are inside are diluted. In order to keep the air a healthy quality as well as keep the moisture inside of the house to a a manageable 40-50% to keep mold from becoming a respiratory issue.
What Advantages Are There to Putting in an ERV system?
An Energy Recovery Ventilator (ERV) system helps you improve your health and comfort while saving you money. Today’s ERV systems are superior to conventional systems in four different ways.
How does an ERV give fresh air all the time?
An ERV gives fresh air all the time because the unit runs continuously at a low speed to supply fresh oxygen to all spaces. While traditional HVAC systems only circulate air when the thermostat turns them on, an ERV will be certain that home ventilation will never stop working. This will give a constant air turnover to eliminate stale rooms and odors that will settle in the rooms.
How Much Money Can an ERV Save on Energy Bills?
In homes with heavy insulation, energy recovery ventilators (ERVs) can cut HVAC energy consumption by 50%. The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) indicates that residential ERVs provide energy savings of 15 to 30 percent per year, compared to standard ventilation systems. Since ERVs precondition the incoming air, they allow your main air conditioner or furnace to use much less electricity or gas to achieve the set point.
Removing indoor pollutants with ERVs?
The answer is yes. ERVs remove indoor pollutants by physically exhausting them out of the building. Great ERVs use multi-stage filtration to keep indoor dust, pollen and outdoor smog from coming inside. They keep exhausting the VOCs from furniture, cleaning, and cooking.
What is the significance of smart air circulation when it comes to the ventilation of a room?
Smart air circulation stops carbon dioxide concentration in places like a home office or a bedroom which could be easily occupied by multiple people. Lots of new ERV systems use smart sensors which measure the quality of air within a room at any moment. If the room becomes a little crowded and the carbon dioxide concentration starts to rise, the system recognizes the situation and increases the air flow to the room to allow ventilation.
What are the benefits of ERVs over exhaust fans?
Traditional exhaust fans are not as good because they only remove air from a space, causing a negative pressure vacuum to pull in air from outside, and that air has no filtration. ERVs are good because they filter the air coming in and recycle some heat to avoid extreme temperatures outside.
When standard bathroom fans are activated, they remove air from the space. Air needs to come from somewhere, and that is through the cracks of doors, unsealed windows, and through dusty cavities in the walls. When air is removed from the space you are losing the heat or cooling that was put into the space and you are also bringing in an outdoor allergens.
ERVs provide filtered air that has been tempered to a neutral temperature. This helps maintain the structure of your home because you are not allowing air to fill the walls and create condensation that can build in there. ERVs also allow you to maintain the environment in the home.
What are the examples of properties for the application of the Energy Recovery Ventilator systems?
Energy Recovery Ventilator systems can be applied in residential as well as commercial properties. Different sizes and designs are customized to different structure's individual building's needs.
What are the benefits of using ERVs in homes?
ERVs are installed in a home’s HVAC system in the duct work. ERVs are especially useful for homes that are older and have no duct work as they have portable units that can be put in one room. These portable units can be attached to the wall and are great for bedrooms, basements, or any home addition that has poor airflow.
What are the commercial applications for ERV systems?
Large ERV systems are installed in large commercial buildings because they help save money on utility bills while still being able to meet the ASHRAE ventilation guidelines. Since many people are in commercial buildings, there are high demands for ventilation systems to keep airborne illnesses from spreading. This is why commercial ERV systems have been created to help facility managers meet high fresh air demands while also being able to decrease their energy costs by 20% to 40% with their HVAC systems.
Improving your indoor air quality
Energy Recovery Ventilators are the best combination of improving your health and increasing the energy efficiency of your property. When the outdated exhaust fan systems are replaced with balanced heat-recovery systems you neutralize the trade-off between fresh air and thermal comfort.
Think about your current work or living space. When you see repeated window condensation, or if you notice odors, or the space just feels stuffy, you have inadequate airflow. An HVAC professional can evaluate your floor plan and provide guidance on properly vented ERV systems.
Frequently Asked Questions (FAQ)
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How much does it cost to run an ERV system?
The cost to run an ERV system is very low. The internal fans are highly efficient DC motors, which means they are often using less power than a standard lightbulb. You will pay a bit more for the electricity to run the fans, but the fans will save you 15-30% on your heating and cooling costs.
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How often do ERV filters need to be replaced?
For optimal airflow and to prevent dust buildup, ERV filters should be cleaned or replaced every three months. Filters need to be changed every month, however, if your home is near areas with heavy pollen, wildfires and/or areas with high pollution to maintain system efficiency.
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Can a bathroom fan be considered as an ERV for room ventilation?
A bathroom fan cannot be considered an ERV because it just removes moisture from one room. It does not bring in new, filtered air, whereas an ERV does. An ERV has a balanced exchange so your room ventilation stays continuous while saving your heating or cooling energy.
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Are ductless ERVs designed for single-room use?
Yes! Ductless ERVs for single-room ventilation are designed for single-room applications. These small units can be installed directly through an exterior wall. They provide balanced heat and moisture recovery for single rooms like bedrooms and home offices and require no ductwork.
