Can you add dampers to existing ductwork?

Author: Jesse Wiegand  |  Last update: Monday, June 2, 2025

One way to install dampers into existing ductwork is simply to cut a hole and use our popular EzySlide® damper. These are typically used if you have access to the ductwork, and the homeowners don't plan to finish their basement.

How much does it cost to add dampers to existing ductwork?

HVAC zone dampers cost $70 to $340 each, depending on the type. Dampers are plates, valves, or vents that open and close to direct the airflow in the ducts. Multiple dampers can be controlled together if they all serve the same zone.

How do you add a damper to ductwork?

Open up the duct work. Drill 2 holes on opposite ends of the duct. These holes should line up with the predrilled holes on the damper. Remove the fasteners from the damper, connect the damper through these holes into your new holes, and tighten.

How do you add zones to existing HVAC system?

Installing HVAC dampers, or duct dampers, is the most common way to incorporate zoning into your current system. These movable plates are located in your ductwork and regulate airflow, redirecting it to specific areas of your home as necessary.

Are HVAC dampers worth it?

In conclusion, HVAC dampers can be a great addition to any home's existing heating and cooling system. By allowing you more precise control over airflow into different areas of your house, they can help maintain comfortable temperatures while conserving energy at the same time.

My house doesn't have dampers! Is it possible to install dampers in existing ductwork?

How much do dampers cost?

A motorized damper regulates the flow of air inside your HVAC system, which in turn controls the temperature in your home. If your damper isn't working, you'll need to replace the part. Expect to pay an average of $350 to replace a motorized HVAC damper, with a typical range of $250 to $450.

Where should HVAC dampers be installed?

A damper will generally be inserted in the supply duct that leads to your upper level. Examine all of the runs and see if any have dampers if you have exposed ductwork. Some houses include dampers in every run, which is excellent for air balancing.

How much does it cost to add a zone to an existing HVAC system?

Zoning Costs

On average, adding a zoning system to an existing HVAC system can cost between $2,000 and $12,500. This includes the cost of dampers, a zone control panel, thermostats for each zone, and labor.

Can you add zones to an existing ducted system?

Yes! It's often possible to add extra zones to an existing ducted air conditioner. Adding new zones isn't always simple, so it's better to invest in a system that has all the zones you want the first time around.

What does an HVAC damper look like?

Butterfly Flat Dish Dampers (BFD) – HVAC Dampers

The butterfly flat dish damper is shaped like a circle with two semicircles attached to it. The semicircles are called flaps, and they open and close to direct airflow through a system.

Do all air ducts have dampers?

Most HVAC systems have dampers installed. There are some exceptions to this, but most of the time, you will find them in your system. If you do not have one installed, then it is time to call an HVAC contractor and have one put in. HVAC duct dampers are primarily used to regulate airflow through the HVAC system.

Can I add a vent to existing ductwork?

You can add a vent to existing ductwork if your AC can handle it.

Does closing damper increase heat?

A wide-open damper will increase the amount of air reaching the fire and improve combustion. As a result, the fire will burn hotter. When you're not using your fireplace, be sure to close the damper to prevent indoor heat from escaping.

How much is a HVAC system for a 2000 sq ft house?

How much does a new HVAC system cost for a 2,000 sq. ft. home? The costs range from $6,224 to $11,434, depending on the system type and installation requirements. Key factors include system size, type, efficiency, and local labor rates.

Which is better, a ducted or split system?

If you are looking for an easy way to cool a large office or home, without the cost of multiple units, then a ducted system would be for you! However, if you are working on a budget; or are only concerned with heating/cooling one or two rooms in a house, we recommend a split-system as the most cost-effective option.

How many zones can you have with ducted air conditioning?

In a typical home setup, you may have around five to seven zones, such as the living area, lounge, study, master bedroom, and remaining bedrooms. By turning off areas that don't require conditioning, you can increase airflow to other zones, achieving your desired temperatures more efficiently.

Can I add a second zone to my HVAC system?

Although you can add zones to your single-zone HVAC system, it isn't ideal unless you have a variable-speed system.

Is it better to have one zone or two zone HVAC?

In most cases, a dual-zone HVAC system is the more energy-efficient and cost-effective option. By relying on one heating and cooling system, you minimize your cooling and heating maintenance needs and repair requests since you won't have to worry about caring for multiple units.

Is HVAC zoning worth it?

Potential cost savings from an HVAC zoning system

According to the U.S. Department of energy, HVAC zoning could lead to a 30% reduction in energy costs. This is because your temperature adjustments are targeted to specific rooms or zones and not the entire house.

Can I add a return to my HVAC?

Yes, some systems are designed to work this way, but most modern duct systems will just usually have one or two returns accounting for the entire system.

How much does it cost to add a damper to HVAC?

Depending on your specific HVAC setup, you might need extra equipment like bypass dampers or sensors, impacting the overall cost. Dampers typically cost $70 to $340 on average, and sensors can range from $30 to $60 each.

How long do HVAC zone dampers last?

The quality of the equipment, how frequently you run your HVAC unit, and if you follow regular maintenance schedules can all affect the lifespan of your HVAC components. Dampers can last around 20 years with proper maintenance.

Does all ductwork have dampers?

Most homes with a second level will have dampers in their HVAC system. Check your air duct runs as they flow away from the main unit. You should be able to determine if there are dampers located in each run of ductwork.

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