Content

Introduction

Many homeowners hear about duct cleaning and duct sealing but aren’t sure which one they need or if they need both. While they sound similar, these are two different services with unique purposes.

In this guide, we’ll explain what each one involves, how they improve your HVAC system, and when it’s best to clean or seal ductwork or do both. If you’re aiming to improve air quality, reduce dust, or lower your energy bills, understanding the difference is the first step.

What Is Duct Cleaning?

Air duct cleaning is the process of removing dust, debris, and other contaminants from the ductwork of your HVAC system. This includes the supply and return ducts, registers, grilles, and sometimes even parts of the furnace or blower.

What’s removed during air duct cleaning:

  • Dust and dirt
  • Pet hair and dander
  • Mold spores and allergens
  • Construction debris
  • Pollen and bacteria buildup

Professionals use a variety of tools depending on the condition of the system. These may include rotating brushes, high-powered vacuum systems, or commercial-grade cleaning machines. Some companies also use sanitizing agents to treat mold or odors.

When is duct cleaning needed?

  • After home renovations or construction work
  • If you notice visible dust blowing from vents
  • When your home feels dusty all the time despite regular cleaning
  • If someone in the home suffers from allergies or asthma

Even with regular HVAC maintenance, ductwork can trap years of buildup. That’s why many homeowners schedule professional air duct cleaning every 3 to 5 years.

What Is Duct Sealing?

While cleaning removes contaminants, duct sealing is focused on closing up leaks in your duct system that let air escape. These leaks can lead to significant energy loss and uneven temperatures in your home.

How is duct sealing done?

  • Using mastic sealant or metal tape on joints and gaps
  • Applying Aeroseal, a modern sealing technology that fills leaks from the inside using pressurized particles

Why duct sealing matters:

  • Homes can lose up to 30% of heated or cooled air due to duct leaks
  • Sealing improves HVAC efficiency and system performance
  • It helps maintain consistent temperatures between rooms
  • It lowers utility bills by preventing energy waste

You should consider sealing your ducts if:

  • Your energy bills are unusually high
  • Some rooms are always hotter or colder than others
  • You see visible gaps in exposed ductwork
  • A home energy audit reveals airflow issues

By sealing your air ducts, you’re not just saving money you’re improving comfort, air circulation, and the overall health of your HVAC system.

Duct Cleaning vs. Duct Sealing – Key Differences

While duct cleaning and duct sealing are often mentioned together, they serve very different purposes. One focuses on air quality, the other on system performance. Both play an important role in keeping your HVAC system healthy and efficient.

Main Differences Between Cleaning and Sealing

Feature Duct Cleaning Duct Sealing
Purpose Removes dust, allergens, and debris Closes air leaks in ductwork
Focus Cleanliness and indoor air quality HVAC efficiency and energy savings
When Needed Visible dust, allergies, post-renovation High energy bills, uneven room temperatures
Tools Used Brushes, vacuums, cleaning machines Mastic, metal tape, Aeroseal technology
Result Cleaner air, less dust Lower energy bills, better airflow
Can Be DIY? Sometimes, with proper accessories Usually requires a professional technician

While they solve different problems, the best results often come when you combine both services. Cleaning removes what’s already inside the ducts, and sealing prevents dust and air loss from re-entering or escaping the system.

Not sure which service your home needs?

Get a professional inspection and personalized duct solution with 1Clean Air your trusted partner in clean, efficient airflow.

Should You Clean, Seal, or Do Both?

If your home hasn’t had any air duct maintenance in years, doing both cleaning and sealing is often the smartest choice. Cleaning removes dust and contaminants, while sealing keeps conditioned air from leaking out boosting your system’s performance and saving on energy bills.

Still unsure? Start with a professional inspection to determine what your home really needs.

Book your duct evaluation today and get expert advice on whether to clean, seal, or combine both services.

How Much Does Duct Cleaning and Sealing Cost?

The cost of air duct cleaning and duct sealing varies depending on your home’s size, the condition of your system, and the method used. Here’s a breakdown of average pricing to help you plan your budget:

Average Cost of Duct Services

Service Average Cost (Residential) What’s Included
Air Duct Cleaning $300 – $600 Full system cleaning, vents, returns, dust and debris removal
Duct Sealing (Manual) $1,000 – $1,800 Hand-applied mastic or foil tape sealing on accessible ducts
Aeroseal Duct Sealing $1,500 – $2,500 Whole-home internal sealing using pressurized Aeroseal technology
Cleaning + Sealing Combo $1,800 – $3,000 Complete clean + seal package, usually includes a system inspection

Prices may vary based on location, system complexity, and square footage.

FAQs – Duct Cleaning and Sealing

Is duct cleaning and sealing worth it?

Yes, when combined, duct cleaning and sealing improve air quality and reduce energy loss. Clean ducts remove allergens and contaminants, while sealing prevents conditioned air from escaping, lowering utility bills.

How much does it cost to seal ductwork?

Sealing ductwork typically costs between $1,000 and $2,500, depending on the size of your home and whether traditional or Aeroseal methods are used. Professional assessment is the best way to get an accurate estimate.

Does cleaning air ducts really make a difference?

Yes. Air duct cleaning can significantly improve airflow, reduce dust, and support respiratory health especially in homes with pets, smokers, or allergy sufferers.

Is duct sealing worth the cost?

Absolutely. Duct sealing can save up to 20–30% on energy bills by preventing leaks. It’s a smart investment if your home has inconsistent heating or high utility costs.

Conclusion: Invest in a Cleaner, More Efficient HVAC System

Whether you’re dealing with dust buildup, rising energy bills, or inconsistent room temperatures, your duct system is likely part of the problem and the solution. Duct cleaning helps you breathe cleaner air, while duct sealing boosts your HVAC system’s performance and reduces energy waste.

The best part? These services work even better together.

Clean air.
Consistent comfort.
Long-term savings.

Book your professional duct cleaning and sealing with 1Clean Air and let us help you optimize your home’s comfort, health, and efficiency.