In this article…
- How Much Does An HVAC System Replacement Cost? Horizontal and Upflow Systems, Tonnage, And Additions
- How To Find The Right HVAC System For You
- Finding The Right HVAC Company For Your System Replacement
Whether you’ve lived in your home for over a decade and noticed efficiency issues with your HVAC system or recently moved into a home with an old AC unit, understanding the cost of your project is one of the first things you want to know.
A full HVAC system replacement is a large investment and can give you pause when you see a multi-thousand-dollar quote for a new system. However, when your unit gives out, constantly spending costs on repairs instead of a full replacement is just throwing money out the window.
So, while you’re shopping around for the right AC company to work with, what system type is right for you, and other indoor air quality upgrades you may be interested in, knowing what goes into the total cost is crucial.
At Wright Home Services, we’ve helped thousands of homeowners replace their HVAC systems and elevate the comfort of their homes since 1979.
Before starting any repair or replacement in your home, knowing how much it will cost and what factors most affect the cost is essential to making an educated decision, and we understand this.
We also understand that many companies like to hide a price tag and wait until they’re in your door to reveal how much your new HVAC system will cost, so we’re here to break down the barrier and provide you with all the information you need to enter your project fully educated.
This article will explore how much an HVAC system replacement will cost in 2025, what factors affect the total cost of a replacement, and how to find the right HVAC system for you.
After reading, you will have a full understanding of how much your HVAC replacement may cost and can find a trustworthy company to work with.
How Much Does An HVAC System Replacement Cost In 2025? 7 Factors
A full HVAC system replacement consists of replacing the interior unit, typically located either in a downstairs closet (upflow) or in your attic (horizontal), the exterior unit, and the thermostat.
On top of these standard replacements, your project may also include indoor air quality (IAQ) upgrades, a maintenance plan, or duct repair or replacement.
In 2025, the average full HVAC system replacement can range from $8,000 – $20,000, including labor costs. (Cost does not include new ducts or duct modifications.)
The full cost of your system replacement depends on a variety of factors, including
- System Type (Upflow or Horizontal)
- System Tonnage
- Duct Repair or Replacement
- Installation Quality
- Warranty Quality
- Maintenance Agreements
- Indoor Air Quality (IAQ) Upgrades
Let’s dive into each of these factors and how much they directly impact your HVAC replacement cost.
1. System Type (Upflow or Horizontal)
The type of system is the first factor that most affects the cost of your HVAC replacement.
There are two main types of HVAC systems: upflow and horizontal.
Upflow systems typically have a unit installed in a closet within your home. These systems have a receiving vent directly below that pulls air in, filters it through the system, up through the ducts, and returns the conditioned air into your home.
Horizontal systems lay horizontally in an attic and receive, filter, and return the heated or cooled air through the ducts.
Replacing horizontal systems is more expensive than replacing upflow systems because of the degree of difficulty involved with installation. HVAC installers must sometimes remove and reinstall your attic ladder, enter a small attic and crawl space, and occasionally catwalks must be installed to access the unit, increasing the price.
It is easier to replace an upflow system that is located on the ground level in your home rather than a horizontal system in an attic. This cost increase is reflected in labor costs.
A horizontal HVAC system replacement can cost about $500 – $2,000 more than an upflow system replacement, depending on the location of the system and the difficulty of accessing the unit.
2. System Tonnage and Efficiency
The second biggest cost factor of your HVAC system replacement is how many tons the new system is and how efficient it is, or the SEER rating (seasonal energy efficiency rating).
The tonnage of a system is the capacity at which the unit can remove heat from the home and how quickly and efficiently it can cool your home.
The efficiency (SEER) of a system is the additional internal components like variable speed and multiple stages of an indoor or outdoor unit. It allows the system to operate smoothly with less strain on the entire system and your electricity bill.
The higher the tonnage and SEER rating on a system, the more it costs because it has a higher capacity and efficiency level to cool your home.
1.5 – 3 ton systems cost around $12,500 or less, on average. 3 – 5 ton systems cost around $12,500 – $20,000, on average.
Some factors that determine the right tonnage for your home depend on the square footage of your home, how well your home is insulated with windows, doors, and insulation, pier and beam foundations, which direction your home faces in relation to the sun, and how many pets and humans live in the home.
The best rule of thumb is to keep your new system with the same tonnage as your old system.
Upping the tonnage of a new system can sometimes create problems, like high humidity or short cycling of the system, otherwise providing too much power for the size of your home.
Unless you have added square footage to your home or have upgraded windows, doors, and attic insulation, it’s best to stick with the same tonnage of your current system.
To confirm the system tonnage you need, the best practice is to have a professional HVAC company perform an engineering analysis or heat load of your home to confirm what size system is needed.
Remember, every home is different and requires unique HVAC solutions, fluctuating the overall price.
3. Duct Repair or Replacement
Your ductwork is a crucial element of your HVAC system, transporting air to and from your home.
If your ducts are damaged and need repairing or replacing, they must be repaired while installing your new HVAC system, or else you essentially negate the benefits of a new system.
Damaged ducts allow air to escape when moving to and from your home, reducing the efficiency of your system and causing unnecessary strain, which can lead to issues down the line.
You want to make sure all ducts leading to and from registers, receivers, and return vents are completely sealed and provide a direct path to the airway.
Depending on the condition of your ductwork, repairing or replacing them can add an average of $5,000 – $9,000 to the total cost of your project.
Even if your ducts are in good shape, you can also add modifications, like Aeroseal, to improve your ductwork and make your system more efficient.
Aeroseal is a leading duct sealant product that seals your ducts from the inside, ensuring any cracks in your ductwork are sealed to minimize air leakage. Installing Aeroseal with your new HVAC system costs about $2700 on top of your new system.
Duct repair or replacement may be necessary depending on the current condition of your ductwork, but adding any duct modifications is optional.
4. Installation Quality
With any home project, cost and quality have a direct relationship. This is true for the quality of the products, installation, warranty, and more.
The lower the quality of installation, the less your project will cost.
Choosing a lower-quality HVAC company with inexperienced or unlicensed technicians can reduce the overall cost of your project by thousands of dollars, which makes the price tag more attractive. However, you will most likely end up paying more for future repairs and part replacements.
Remember – you get what you pay for.
Paying for a high-quality system and installation upfront is much better than choosing the cheaper option and regretting it in the future.
When looking for the right HVAC company to work with, it’s important you know exactly what qualities to look for to find a trustworthy company and avoid choosing the wrong one.
5. Warranty Quality
Along with the quality of labor and installation, the quality of the warranty you get with your new HVAC system will also affect the overall cost.
Your new system comes with a manufacturer’s warranty for all parts and components of the system that outlines what parts are covered, what types of damages are covered, what the manufacturer will provide if damaged or defective, and what voids the warranty.
The labor warranty is dependent on the company that installed your system. A standard labor warranty may be provided, but a more robust, high-quality warranty is an added cost.
For example, Wright Home Services offers an extensive 10-year labor warranty from JB Warranties for an additional $1,592, or about $160 a year.
A higher-quality warranty, whether included or as an additional cost, will cost more than a lower-quality warranty or no warranty at all.
The quality of your warranty on both the products and labor reveals the quality of what you are paying for. The better the warranty, the more it will cost.
Think about it. If you choose a cheaper company that offers no warranty with the replacement, what happens when something goes wrong? You are left to front the entire bill.
Choosing to work with a high-quality HVAC company that offers a quality warranty ensures they will be there when something goes wrong.
Read more about 6 questions to ask to choose the best HVAC system for you!
6. Maintenance Agreements
While high-quality warranties add to the cost of a new HVAC system, some companies also offer additional maintenance agreements that are optional but will increase the cost.
A typical maintenance agreement with a new HVAC system can include things like biannual tune-ups and maintenance, discounts on part replacements and repair, or priority service.
Maintenance agreements can cost anywhere from $80 – $400 per year, depending on the company and all that is included.
If you plan to live in your home for the rest of your life (or at least a long time), investing in a maintenance agreement for your new system may be worth it for you.
7. Indoor Air Quality (IAQ) Upgrades
The final factor that affects the cost of your new HVAC system is if you decide to add any indoor air quality (IAQ) upgrades. These upgrades are not part of your HVAC system but are optional additions to improve the IAQ of your home.
IAQ upgrades, such as a UV stick light or Solaris IAQ system, are installed within your HVAC system to help reduce condensation, microbial growth, allergens, pet odors, cooking odors, dust, dirt, and volatile organic compounds (VOCs) while also filtering the air before returning into back your home.
Any upgrade you add to your system will add to the total cost.
For example, Solaris IAQ Systems costs around $2,700. Adding a UV stick light can cost around $500.
IAQ upgrades help keep your system clean and improve the overall air quality of your home by reducing dust and allergies. They can also help extend the lifespan of your new system while increasing your home’s comfort.
How To Find The Right HVAC System For You
After learning all about what factors most affect the cost of your HVAC system, the next question you have is “How do I choose the right system for me?”
Like any product, finding the best option for you all depends on your wants, needs, and goals for the product.
When it comes to a new HVAC system, first think about your current system.
What do you like and dislike about the system? What do you wish it did better? Do you want more high-tech upgrades? Do you want to add new IAQ upgrades to your home?
These are just a few questions to consider when shopping around for a new HVAC system.
Your budget is another major influence in finding the right system for you. With this, it’s important to remember that many high-quality HVAC companies offer payment plans with your new system. Monthly payments can start as little as $132 a month with approved credit.*
With the right approval, you can comfortably pay for your new system over several years at a low interest rate, allowing you to choose a more expensive system if you wish while maintaining comfort financially.
Finding The Right HVAC Company For Your System Replacement
Now that you understand the average cost of an HVAC system replacement, the top seven factors that influence that cost, and how to choose the right system for you, you’re ready to take the next step in finding the right company to work with.
Understanding the cost of any project is one of the first things you want to know.
When it comes to your new HVAC system, remember to take these factors into consideration before questioning the cost:
- The type of system
- The tonnage and efficiency of the system
- Duct repairs or replacements needed
- Quality of installation
- Quality of warranty
- Added maintenance agreements
- IAQ upgrades
By understanding the price and knowing how much your project should cost, you can easily identify when a company is ripping you off or trying to take advantage of you with an insanely low (or high) ticket price.
At Wright Home Services, educating you is our number one priority. We understand that any AC repair can be a pain, and we’re here to provide you with all the information you need before making any decisions.
Finding the right AC company to work with is essential for any HVAC repair or replacement. So, if you’re looking to replace your system, you must find a trustworthy company to work with to provide you with a proper replacement and aftercare.
To help you find the best HVAC company for your project, check out this article that outlines 12 qualities to look for in a high-quality HVAC company, including the longevity of the business, online reviews, photos of their technicians and their work, and more.
Then, you will be equipped with the right knowledge to identify a high-quality HVAC company from a faulty one and ensure your new system is installed correctly.
*Monthly payment options are dependent on the financing company, your credit score, and the payment option you choose.
