What Is Whole-House Ventilation? Here’s How to Choose the Right Home Ventilation System

You might not think about the air you breathe inside your home, but its quality plays a huge role in your health and well-being. But installing the right home ventilation system can keep the indoor air quality fresh and safe to breathe. Ventilation inside a home occurs in one of three ways: natural ventilation, spot ventilation, or whole-house ventilation. Out of those methods, whole-house ventilation is the most efficient way to circulate fresh air in your home. Here, we dive into the question, “What is whole-house ventilation?” We’ll also break down the four types of whole-house ventilation systems so you can decide which one is right for you.

What Is a Home Ventilation System?

A home ventilation system essentially acts as your home’s lungs, inhaling fresh air and exhaling stale air. A ventilation system consists of mechanical fans and vents that send and receive air. The air is sent through ductwork and dispersed throughout your entire home.

These are the three methods for indoor air circulation:

• Natural ventilation occurs as air naturally moves in and out of a home, either through cracks or holes in the walls or through open windows and doors.

• Spot ventilation is ventilation confined to a specific location with an exhaust fan, like a bathroom fan or stove vent hood.

• Whole-house ventilation is performed with a system of ducts and fans that circulate air mechanically throughout an entire home. A whole-house ventilation system is the best option for removing moisture, improving indoor air quality, and creating more energy-efficient homes.

For our purposes, we’ll focus on four different types of whole-house ventilation systems so you can decide which one is right for you.

Benefits of Whole-House Ventilation

A whole-house ventilation system replaces stale indoor air with fresh outdoor air, reduces allergens, and controls moisture. In short, it’s essential for improving air quality inside your home. Without one, air can become stagnant, retain pollutants, or promote mold and mildew growth.

In addition, whole-house ventilation distributes cool or warm air (depending on the season) throughout your home more effectively, improving temperature control and comfort.

4 Types of Whole-House Mechanical Ventilation Systems

There are four main types of whole-house ventilation systems, each with its pros and cons. 

1. Exhaust-Only Ventilation

Exhaust-only ventilation systems work to depressurize your home and exhaust out all of the spent air. The exhausted air is then replaced through natural ventilation—air that seeps in through building openings, like cracks, holes, windows, and doors—and passive air vents located in windows and walls.

Typically, a centrally located exhaust fan collects all of the stale air and sends it out of the home through an exhaust pipe. The exhaust fan is usually connected to ductwork that travels to specific rooms where pollutants are most often created, like bathrooms and kitchens.

Exhaust-only systems are only practical in cold climates. In hot climates, the depressurization can bring moist, humid air into your home, causing condensation and moisture damage.

Pros:

• Relatively inexpensive system

• Simple installation process

• Best suited for cold climates

Cons:

• Does not remove moisture from air

• Not compatible with hot climates

2. Supply-Only Ventilation

On the contrary, supply-only ventilation systems work to pressurize your home and force fresh air inside. Spent air leaks out through holes and cracks in the building’s facade and wall or floor vents.

Similar to an exhaust-only system, a supply-only system consists of a centrally located supply fan. A fresh air inlet pipe sends fresh air to the fan, which then distributes it throughout your home via ductwork. The ductwork usually runs to rooms most often used and in need of fresh air, like living rooms and bedrooms.

Supply-only ventilation systems are most appropriate for warm climates. The pressurization can create moisture issues in cold climates. 

Pros:

• More control than exhaust-only systems

• Relatively inexpensive system

• Simple installation process

• Best suited for warm climates

Cons:

• Does not remove moisture from air

• Not compatible with cold climates

3. Balanced Ventilation

Balanced ventilation systems do not pressurize or depressurize but rather bring fresh air in and send polluted air out. For this reason, balanced ventilation systems are often the most adaptable and preferred option.

A balanced ventilation system has a fan and duct system for fresh air supply and a separate fan and duct system for exhaust air removal. Vents and ductwork for each system can be installed in every room, but at minimum, fresh air supply should reach living rooms and bedrooms and exhaust air removal should pull from kitchens and bathrooms.

This type of whole-house ventilation system is appropriate for all climates. The system is more costly than an exhaust-only or supply-only system as it is essentially two systems requiring two fans and twice as much ductwork.

Pros:

• Compatible with all climates

• Home is not pressurized or depressurized

Cons:

• Expensive to install

• Does not remove moisture from air

4. Energy Recovery Systems

There are two kinds of energy recovery systems: energy recovery ventilators (ERV) and heat recovery systems (HRV). Both types circulate fresh air throughout your home, but ERVs can also transfer moisture to reduce humidity levels in your house.

ERV systems are better for places with hot or humid weather since they’re good at removing humidity from the air. However, they run on electricity, which can increase your energy bills—especially if you live in a mild climate or just don’t use your HVAC system very often.

On the other hand, HRV systems are the better choice if you live in a cold climate because they have defrost systems to prevent them from freezing up. ERVs don’t have that functionality.

Pros: 

• Improves temperature control and comfort

• Options for all climates

Cons:

• Could increase your electricity bills

• Can be noisy

Which Ventilation System Is Right for Your Home?

A whole-house ventilation system keeps the air in your home circulating and healthier to breathe. The right system for your home ultimately depends on your climate and budget. The least expensive options for a whole-house ventilation system are exhaust-only and supply-only systems; however, exhaust-only systems are only appropriate for cold climates and supply-only systems are only appropriate for hot climates. 

If your home doesn’t reside in a cold or warm climate, you will need to opt for a balanced ventilation system or energy recovery system. However, these systems do come at a higher price tag for installation, as they require multiple fans and ductwork to supply fresh air and exhaust polluted air. You can contact a local HVAC company to learn about the different options available, and collect quotes.

If you already have one of these ventilation systems and are in need of some upgrades, you could be eligible for a rebate under the 2022 Inflation Reduction Act. The High-Efficiency Electric Home Rebate Act (HEEHRA) may cover some or all of your ventilation upgrades depending on your household’s income level.

Brionna Farney contributed to this article.