Your home is growing with your new addition.
So is the challenge of maintaining comfort.
You want efficient and effective heating and cooling in your new space for every season.
With your existing central HVAC system, you’re wondering whether to extend its ducts. Should you add a mini split system to your addition?
This guide will give you the clarity and confidence you need to decide.
Ducted HVAC Extension and Mini Split Basics
Ducted HVAC Extensions
Extending your existing HVAC system to include new additions is a practical choice.
This allows you to keep a steady temperature in all rooms.
That way, even new spaces are as comfortable as the original structure.
Mini Split Systems
Mini splits are modern, ductless heating and cooling systems. They have an outdoor compressor unit connected to one or more indoor air handling units.
Each indoor unit is usually on the wall or ceiling. A small conduit runs through a three-inch hole in the wall to connect it to the outdoor unit.
Mini splits’ zonal capabilities are a major benefit. This lets you heat or cool only the areas in use that have mini splits, which can lead to big energy savings.
When Each Option is More Appropriate
Choose a ducted HVAC extension if…
- The room you’re trying to heat/cool is large, and/or ductwork can be easily routed to it
- You prefer not to have visible indoor units
- Your existing HVAC system is sufficiently powerful to handle more rooms
- You value having a single, unified system to manage the climate control in your home
Choose a mini split if…
- Extending the ducts is difficult because your addition is detached or far from the main house
- Cutting into walls is unfeasible because they’re load-bearing or protected historical structures
- You prefer zone-specific temperature control to enhance energy efficiency
- Installation speed and minimizing home disruption are priorities for you
Cost Comparison: Installation and Operation
Installation Costs
Ducted HVAC Extensions
Expanding your existing ducted HVAC system to new additions can be cost-effective. However, this is only if the existing infrastructure supports the expansion.
Costs range from $500 to $2,000 per room. The range depends on accessibility and material needs.
Major cost factors include:
- the number of vents needed or infrastructure adjustments for obstacles like finished basements and load-bearing walls
- the extensive labor, including cutting into walls and ceilings to extend ducts
Mini Split Systems
Installing mini split systems ranges from $3,000 to $8,000 per unit.
The main costs associated with mini splits include:
- the purchase price of both units
- the labor associated with their installation, which is less invasive than ductwork extensions
Operational Costs
Ducted HVAC Extensions
Ducted systems provide whole-home heating and cooling. However, they can be less efficient due to energy losses through ducts by thermal transfer or leaks.
These energy losses can raise utility bills. This is especially true in extreme weather when your HVAC system works harder.
Mini Split Systems
Mini splits are usually more energy-efficient than traditional ducted systems. This is mainly due to their ductless design, eliminating duct-related energy losses.
Their zoned cooling and heating can condition specific areas that have mini splits. This avoids heating or cooling unoccupied spaces.
Energy Efficiency and Environmental Impact
When evaluating heating and cooling, energy efficiency isn’t just about cost savings. It’s also about shrinking your environmental footprint.
Mini splits are recognized for their great energy efficiency. They also offer benefits for the environment.
SEER Ratings
Mini splits usually have high SEER ratings. SEER measures cooling output per season divided by electrical input.
The higher the SEER rating, the more efficiently a unit operates.
Most modern mini splits have SEER ratings from 15 to over 30. These are much higher than many traditional HVAC systems, which average 14 to 20 SEER.
Even if you can extend your ductwork to your addition, it’s not always worth it if the mini split’s SEER rating is notably higher than your current HVAC system’s.
Global Warming Potential (GWP) Refrigerants
Many newer mini split models use refrigerants with a lower Global Warming Potential (GWP) than traditional refrigerants used in older HVAC systems.
This shift is part of the industry’s response to environmental regulations. The rules aim to reduce the ecological impact of heating and cooling systems in Pennsylvania and beyond.
Refrigerants with a lower GWP cause less environmental damage if they leak, contributing to the systems’ sustainability.
Installation Process
Extending Your Ducted HVAC System
Extending ductwork takes a few days to several weeks. The time depends on the installation’s complexity.
Design and Planning: The first step is to assess your current HVAC system and home layout. This will see if your existing unit can handle the added load and where new ducts are needed.
Ductwork Extension: If the system is capable, the next step is to install the new ductwork. This may require opening walls, ceilings, or floors.
System Integration: The existing HVAC unit must be connected to the new ductwork, ensuring that airflow is efficiently managed between the old and new sections of the system.
System Testing and Balancing: Once the extension is in place, the entire system must be tested to ensure it operates efficiently and evenly distributes air throughout the home, including the new spaces.
Mini Split System Installation
Each unit typically takes less than a day to install. Even multi-zone systems can be set up in just a few days.
Site Assessment: A technician assesses the best spots for the indoor and outdoor units. Placement considerations include avoiding direct sunlight on the outdoor unit and ensuring adequate space around it for air circulation.
Mounting Indoor Units: They are typically mounted on walls or ceilings. They require only a small hole (about three inches in diameter) through the external wall for the conduit.
Connecting Indoor and Outdoor Units: The conduit connects the indoor unit to the outdoor unit. It houses the power cable, refrigerant tubing, and a drain for condensation.
System Testing: Once installed, each unit is tested to ensure it operates efficiently and effectively cools or heats the designated zones.
Maintenance Requirements
To keep a comfy home, you need ongoing maintenance to ensure these systems work well.
With a simple setup and less moving parts, mini splits require less extensive maintenance.
Ducted HVAC System Maintenance
Duct Cleaning: Over time, ducts accumulate dust, debris, and even mold, which reduce air quality and system efficiency. Professional duct cleaning is recommended every 3 to 5 years to ensure optimal airflow and prevent contaminants from circulating throughout your home.
Filter Changes: The air filters in a ducted system should be checked and replaced regularly, typically every 90 days, or more frequently if you have pets, pollen allergies in the spring, or respiratory issues. Changing filters regularly helps keep the air clean. It also stops HVAC systems from overworking, which can cause higher energy use and wear.
System Inspections: Annual inspections by a qualified HVAC technician help catch leaks, mechanical wear, and electrical problems before they lead to more significant problems. These inspections often include checking the thermostat calibration, ensuring the HVAC system cycles on and off properly, and inspecting the condensate drain for blockages.
Mini Split System Maintenance
Cleaning Filters: Mini splits have washable filters. They should be cleaned monthly to keep air flowing and indoor air clean. Cleaning involves removing the filters from the indoor units and washing them gently with water.
Servicing the Outdoor Unit: The outdoor component of a mini split system also requires annual checks. It should be kept clear of debris, leaves, and dirt, which can obstruct the condenser coils and reduce the system’s efficiency. A professional should check the refrigerant levels and inspect the electrical connections annually.
Checking the Indoor Unit: In addition to filter cleaning, check for signs of condensation or leakage. Clean the coils to ensure dust doesn’t reduce efficiency.
Aesthetic and Noise Considerations
When choosing a heating and cooling option, it’s not only the functionality that matters. Also, consider how it fits into your home’s design and how quietly it operates.
Aesthetically, the only visible part of a ducted HVAC system is the unit itself. However, mini splits are quieter because the compressor operates outside.
Aesthetic Impact
Ducted HVAC Systems
Once installed, ducted systems are almost invisible. They blend smoothly into your home’s structure.
The only visible parts are the vents and thermostats. They can be designed to match your home’s interior, making them barely noticeable.
Mini Split Systems
Mini splits include indoor units mounted on walls or ceilings and visible in the living space.
These units come in various styles and can be sleek and modern, but they may not blend perfectly with every interior design.
Noise Considerations
Ducted HVAC Systems
Ducted systems can be noisy. This is especially true for older models or those needing maintenance.
The noise mostly comes from the air handling unit and air movement through the ducts. This can create a hum that might be noticeable in quiet places.
Mini Split Systems
One of the significant advantages of mini splits is their quiet operation.
Modern mini splits typically operate between 19 to 34 decibels, quieter than a typical conversation.
This low noise level is due to the design of the indoor units and the fact that the noisiest component, the compressor, is located outside the home.
System Lifespan
Both ducted HVAC systems and mini splits last a long time. However, their durability and performance depend heavily on maintenance and installation quality.
Usually, mini splits last longer.
Ducted HVAC Systems
New ducted systems last 15 to 20 years, while ducts last about 10 to 15 years.
When considering a ductwork extension for your HVAC system, your unit has probably been in place for at least five years.
When deciding on the best solution for your household, consider your system’s current age and how much time it has left.
The longevity of ducted systems is influenced by:
- the quality of the installation
- the regularity of maintenance
- the quality of components used
Mini Split Systems
Mini splits can exceed the typical 20-year lifespan with proper care and maintenance.
Their longevity is also influenced by maintenance regularity, component quality, and installation quality.
Environmental Factors
The environment in which the system operates can also affect its reliability and lifespan.
Systems in areas with extreme weather conditions or high dust levels and airborne particulates may require more frequent maintenance.
Coastal environments, for example, accelerate corrosion in outdoor components, affecting system reliability.
Thankfully, most Pennsylvanians don’t have to worry about these extreme conditions.
Kauffman Gas Can Help With the HVAC Solution You Choose
Deciding between a ducted system extension and mini splits involves weighing the initial costs against long-term savings and considering the specific needs of your home’s layout and climate control preferences.
At Kauffman Gas, we are here to help you make a choice that ensures comfort through every season.
If you’re ready to discuss the best HVAC solution for your home or need more information to help make your decision, don’t hesitate to contact us.
We won’t leave you out in the cold.
Contact us today!
FAQs
Are mini splits more efficient than ducted?
Yes, mini splits are generally more energy-efficient than traditional ducted systems. They minimize energy loss by eliminating the need for ductwork and allow for zoned temperature control, which reduces unnecessary heating and cooling.
Which is better, ducted or ductless?
Ductless systems (mini splits) are more energy-efficient and are better for targeting specific areas or additions. Ducted systems provide a more consistent overall climate control across an entire home. The best choice depends on your home’s layout and climate control needs.
What is a common mistake in ductwork installation?
A common mistake in ductwork installation is improper sizing and layout. Ducts that are too small restrict airflow, reducing efficiency and straining the HVAC system. Improper sealing of joints can also lead to significant energy losses through air leaks.
What is the maximum length of an HVAC duct?
The maximum length of HVAC ductwork varies based on the system’s design and capacity, but typically, the main trunk duct run should not exceed 30 feet. Branch take-offs will be anywhere from 35 to 50 feet long. Longer ducts can decrease efficiency due to the potential for air loss and reduced airflow velocity.