Approximately 70% of all U.S. households have a central HVAC system. These systems typically feature an air handler, along with a combination of an air conditioner, heat pump, or furnace. Central systems rely on ductwork to distribute airflow evenly throughout a home. The Department of Energy warns that the average duct system suffers from serious leakage due to poor maintenance and old age. Let’s explore the signs that it’s time to replace your HVAC ducts.
Ducts Are Older Than 25 Years
Sheet metal-based ductwork can last upward of 25 years with proper maintenance. After that point, it’s often not cost-effective to continue maintaining them. It can be difficult to reduce leakage to an acceptable level. That can cause a host of comfort, energy efficiency, and indoor air quality issues. Additionally, modern duct science has evolved greatly over the last couple of decades. The easiest time to replace your ducts is after the 25-year mark, when it’s time to upgrade your central HVAC equipment. Duct replacement will also typically be less expensive as you spread the overhead across the various installation tasks.
You’re Upgrading to a High-Efficiency HVAC System
Consider replacing your ducts regardless of age when upgrading to a high-efficiency central HVAC system. Such systems often have variable-speed air handling, mechanical duct dampers, and smart thermostats with zone control. Zoning allows for personalized comfort and energy savings as high as 30% over traditional single-zone HVAC systems. That said, it’s crucial to get the air balancing just right, which is more difficult to do with older duct designs.
Visible Duct Damage
HVAC technicians inspect exposed duct exteriors as part of seasonal HVAC maintenance. That inspection can reveal the most common duct issues households experience. Duct seals and mounting hardware can wear over time, resulting in gaps. Those gaps cause the aforementioned leakage, which undermines comfort, energy efficiency, and indoor air quality. Failed mounting hardware can lead to collapsed duct sections that you’ll need to replace entirely. Any rust or other corrosion is also a major concern. That means moisture is or was present, and that brings its own challenges, including negative health implications.
High Electricity and/or Fuel Consumption
Homeowners should track their energy use month to month and year to year. There are also energy monitoring smart thermostats that can provide you with high-usage alerts. If you experience a sudden spike in usage during winter or summer, it may be HVAC-related. Even a relatively low level of duct leakage, such as 10%, can make a noticeable difference in your bills. Your heating and cooling costs will be 10% higher than they need to be. This increase will be even more dramatic when leakage deteriorates to 20% or worse.
Noisy Ductwork
A well-maintained duct network shouldn’t make any noises at all. You may hear the whoosh of the air coming on, but that should be about it. Rumbling and other loud sounds are generally caused by loose metal, including panels and mounting hardware. Non-duct-related issues can cause loud duct sounds as well, including high air pressure, such as due to an airflow obstruction. Other issues include thermal expansion and contraction, which may indicate poor insulation.
Uneven Heating and Cooling
Installers configure central HVAC systems to operate at a particular static air pressure. At the right pressure level, the air flows evenly throughout the entire home. Duct problems can lead to pressure that’s either too high or too low. That can cause the air to distribute unevenly throughout your home. You may experience cold spots in winter and warm spots in summer. In multistory homes, there can be sharp temperature differences between floors. You may also experience heightened moisture buildup in lower levels, including basements and crawl spaces.
Excessive Dust Accumulation
Air quality experts recommend deep dusting your home at least once a week. If you notice dust buildup around your baseboards despite this, it may be an HVAC-related problem. Dust can accumulate in ducts over time, undermining air quality and eventually airflow. You may notice dust coming from the return registers throughout your home. Another common sign is your HVAC filter clogging faster than normal.
Mustiness or Other Persistent Odors
Old, poorly maintained ducts can lead to mustiness and other lingering odors. You may notice them at first only when the system cycles on. Over time, they can persist even when the system isn’t running. This can lead to stale air, unpleasant smells, respiratory inflammation, and even heightened allergy symptoms.
Moisture, Mildew, or Mold in Your Ducts
Moisture in your ducts is a serious problem with negative health implications. Those issues intensify greatly once mildew or mold takes hold. The first step is to eliminate the source of the moisture, such as a roof leak. It is possible to sanitize ducts with moisture and mold. Yet, in most cases, it’s simply more cost- and time-effective to replace the ducts.
Pest Infestations
The other issue with moisture is that it can attract pests. Birds, rodents, cockroaches, and other insects can nest in your ducts and destroy your ductwork insulation and even HVAC wiring. You’ll need the help of an exterminator, and then, it’s typically best to replace the infested ducts.
Poor Indoor Air Quality
Leaky ducts can cost you 20% or more of your heated and cooled air. That escaping air causes negative air pressure, which draws ambient air into the ducts. Cold air in winter can dry out your home, while humid summertime air can promote mold and dust mites. The ambient air can also be rich in pollutants and other contaminants, including pathogens. Professionally sealing your ducts can reduce leakage from as high as 50% to less than 5%.
You can also install duct upgrades for active protection against pollution and humidity issues. Inline humidity control equipment can maintain your optimal relative humidity throughout your home year-round. A whole-house air purifier can trap over 99% of particulate matter and neutralize gases and airborne chemicals. An in-duct germicidal lamp can deactivate over 99% of bacteria, viruses, and other pathogens.
Inspecting and Maintaining Your Ducts
Schedule at least two HVAC maintenance appointments annually: a cooling tune-up in early spring and a heating tune-up in early fall. A technician will visually inspect the duct exteriors for gaps, corrosion, and other issues. Every several years, schedule a duct camera inspection. Using high-definition cameras, a technician can inspect your duct inside and out and recommend maintenance or replacement as needed. The average household needs professional duct cleaning every three to five years. If you have leaky ducts, you may need aerosol-based duct sealing. Other potential repairs include replacing insulation, panels, mounting hardware, and so forth.
Your Local Duct Replacement Specialists in Medina
Since 1985, Gene’s Refrigeration Heating & Air Conditioning, Plumbing & Electrical has provided ductwork solutions for homeowners in Medina, OH. Our NATE-certified technicians inspect, maintain, repair, and install ducts. We also offer duct cleaning, high-MERV HVAC filters, indoor air quality solutions, and additional services. To schedule an appointment, call today or contact us online through our website.
