On average, replacing an air conditioning and gas furnace split system in a 2,300-square-foot home costs about $12,578 for a 14.3 SEER2 (Seasonal Energy Efficiency Ratio) unit. Expect to pay $6,370 for a low-end 12.4 SEER2 system or $28,287 for a 16.1 SEER2 unit. Your final cost depends on various factors, such as the type of system you choose, its efficiency rating, and the complexity of the installation.
In our guide, we’ll go over what you can expect to pay, how system types and SEER ratings impact price, typical installation costs, and key considerations when selecting a system that fits your home and budget.
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HVAC Replacement Costs by System Type
Choosing the right HVAC system is one of the most important decisions you’ll make for your home’s comfort and efficiency. There are five main system types: AC and gas furnaces, AC and electric furnaces, heat pump and air handlers, dual fuel systems, and air conditioner-only systems. You’ll also need to consider the SEER2 rating, which measures the efficiency of an air conditioning system in cooling your home over an entire season. The higher the SEER2 rating, the more efficient the system is, and typically, the higher the upfront cost.
Pro Tip
- Before choosing a system type, consider your existing fuel source. As This Old House heating expert Ross explains, “Electric baseboard has been the most expensive system to heat a building, and followed up by your propane and oil furnaces would be your next. And then gas and heat pumps are kind of there in kind of the next category.” That fuel-cost ranking has remained remarkably consistent over the years, so your current energy source should heavily influence which system type makes the most financial sense.
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Ad DisclaimerFor a 2,300-square-foot home, here’s what you can expect to pay across different system types, based on low (12.4 SEER2), high (16.1 SEER2), and average (14.3 SEER2) price points:
| System Type | Low Cost | High Cost | Average Cost |
|---|---|---|---|
| AC & gas furnace | $6,370 | $28,287 | $12,578 |
| AC & electric furnace | $5,762 | $25,010 | $11,168 |
| Heat pump & air handler | $6,295 | $27,881 | $12,404 |
| Dual fuel system | $7,988 | $37,017 | $16,335 |
| Air conditioner only | $5,917 | $25,845 | $11,528 |
Pro Tip
- When weighing the higher upfront cost of a heat pump system against a traditional AC and furnace setup, keep operating costs in mind. As Ross noted on Ask This Old House, “It’s always very important to make sure that we are installing these heat pumps to lower the operating cost of that building.” If you’re currently heating with expensive electric resistance or propane, the savings from switching to a heat pump can be significant—but if you already have access to affordable natural gas, the payback period will be longer.
HVAC Replacement Cost Breakdown
When planning your HVAC replacement, it’s important to understand what you’re paying for. The amount you pay isn’t just for the unit itself— it includes labor and permits. Labor typically accounts for a large portion of the total project cost, covering installation, wiring, refrigerant handling, and testing. Permits, which ensure the system meets local codes, usually cost a few hundred dollars.
Here’s a breakdown of these cost components based on a 2,300-square-foot 14.3 SEER2 system:
| Cost Component | Estimated Cost |
|---|---|
| Equipment (unit) | $4,935–$17,866 |
| Labor | $1,949–$4,440 |
| Total | $6,884–$22,306 |
Additional Charges for an HVAC Installation
Similar to most home improvement projects, there may be additional features you can add to your new HVAC system that increase its functionality—and cost. Beyond the basics, some optional add-ons can improve comfort and efficiency. These include smart thermostats, zoning systems (which let you control temperatures in different parts of the house), ductwork repairs or replacements, and air purification systems. While these extras can raise your upfront cost, they often pay off in better comfort and long-term energy savings.
| Additional Charge | Estimated Cost |
|---|---|
| Thermostat | $39–$217 |
| Ductwork replacement | $1,500–$3,000 |
| Permits | $250–$400 |
How Do I Determine the Tonnage or SEER2 Rating?
Tonnage refers to your system’s cooling capacity, not its weight. One ton equals 12,000 British Thermal Units (BTUs) per hour, and a 2,300-square-foot home usually requires a 4-ton system. SEER2 ratings reflect energy efficiency; the minimum today is 12.4 SEER2, but upgrading to 16 SEER2 can significantly reduce energy bills.
Pro Tip
- As This Old House contractor Joe explains, a higher SEER rating works “sort of like miles per gallon in your car—the higher the SEER rating, the less it costs you to operate.” Jumping from the minimum 12.4 SEER2 to 16.1 SEER2 carries a noticeably higher upfront price, as the table shows, but local utility rebates can help offset the difference. As Richard Trethewey notes, “the monthly payment also oftentimes for the new equipment is less money than you’re gonna save in terms of operating costs.”
The table below summarizes the average, low, and high costs for an AC and gas furnace system type in a 2,300-square-foot home, based on 12.4–16.1 SEER2 systems.
| SEER2 Rating and System Type | Low Cost | High Cost | Average Cost |
|---|---|---|---|
| 12.4 SEER2 (AC & gas furnace) | $6,370 | $20,445 | $11,510 |
| 13.4 SEER2 (AC & gas furnace) | $6,565 | $21,152 | $11,915 |
| 14.3 SEER2 (AC & gas furnace) | $6,884 | $22,306 | $12,578 |
| 15.2 SEER2 (AC & gas furnace) | $6,849 | $22,180 | $12,506 |
| 16.1 SEER2 (AC & gas furnace) | $8,536 | $28,287 | $16,014 |
Pro Tip
- Richard Trethewey, This Old House plumbing and HVAC expert, stresses that oversizing is a common and costly mistake: “Oversizing is one of the biggest issues in air conditioning because if you’re too big, it just doesn’t work, it’ll freeze up.” He recommends expecting roughly a ton of cooling for every 500 to 600 square feet as a starting-point rule of thumb, but always confirming with a proper load calculation.
Note that SEER2 requirements vary by region. For example, the Southeast and Southwest regions require a minimum of 14.3 SEER2 for new central air conditioners. Lower-rated units, such as those with a 12.4 SEER2, are no longer widely available due to updated federal efficiency standards. Your contractor can help you ensure your unit meets requirements.
To nail down the right tonnage and avoid over- or under-sizing, This Old House energy expert Jeremy Draper recommends a Manual J load calculation. As Draper explains, the process starts “with the architect’s drawings of the as-built conditions” and accounts for “all the windows, doors, floors and ceilings,” entering them into specialized software that handles the complex math. This ensures the system is precisely matched to your home’s actual thermal characteristics rather than relying on rough estimates.
How Does My Location Affect Cost?
Where you live can have a big impact on the total cost of your air conditioning system. Labor rates are generally higher in urban and coastal areas, typically accounting for five hours per unit of installation time. In areas with difficult installation conditions, such as tight attics or crawl spaces, expect to pay more for labor. Higher labor costs are common in certain areas, such as the Northeast and Hawaii, with rates reaching as high as $4,440 for a 2,300-square-foot home. The South is normally the cheapest, with some areas at just $1,949 in labor costs.
Editor’s note: Although this article discusses SEER2 ratings in the context of AC and gas furnace split systems, SEER2 applies only to the air conditioning portion. SEER2 measures cooling efficiency and does not apply to the heating performance of gas furnaces.
FAQs About Air Conditioner Costs for a 2,300-Square-Foot Home
How long will the installation take for my 2,300-square-foot home?
For a typical 2,300-square-foot home, a complete HVAC system replacement usually takes one to two days to complete. Day one typically involves removing the old system, installing the new equipment, and connecting it to existing ductwork and electrical systems. A second day may be needed for complex installations, especially if you’re upgrading to a different system type or if ductwork modifications are necessary.
What rebates and tax incentives are available for my new system?
Several financial incentives can significantly reduce your out-of-pocket costs for a new HVAC system in a 2,300-square-foot home. The federal government offers tax credits for high-efficiency systems through the Energy Efficient Home Improvement Credit, providing up to 30% of costs. A good HVAC contractor can help identify all available incentives and may even handle the paperwork.
Pro Tip: The Inflation Reduction Act of 2022 put $370 billion in funding toward climate-change initiatives, including provisions that give hundreds or thousands of dollars back to homeowners for weatherization and energy-efficiency home-improvement projects. That cash back comes in two buckets: tax credits and purchase rebates, which will be available through September 2031 or through 2034, depending on the program. For tax credits, you fund the project up front but receive money back via a discount on the amount of taxes owed at the end of the year. If you don’t owe any tax in the year you spend the money, some credits can be carried forward.
How can I evaluate the warranty for my new HVAC system?
When evaluating warranties for your new HVAC system, focus on these key aspects: First, distinguish between the manufacturer’s warranty (covering parts) and the contractor’s warranty (covering labor). Manufacturer warranties typically range from five to 10 years for parts, while top-tier brands may offer 12 years or more, or even lifetime coverage, on major components such as heat exchangers. Labor warranties from contractors usually span one to five years.
Pro Tip: Heather Wilson of American Home Shield advises that the best way to protect yourself is to read the fine print. Most warranty plans cover normal wear and tear, so understanding the distinction between covered maintenance failures and excluded issues—such as improper care or pre-existing conditions—is critical before you sign on.
Michael Marshall, a buyer’s agent in Worthington, Ohio, cautions that homeowners often discover gaps in their warranty coverage. “Home warranties are a good value, but they can be difficult to deal with,” says Marshall, who has successfully challenged insurers on behalf of clients denied coverage for reasons that include improper care and maintenance, excluded parts and services, or dollar limits for certain repairs. He likens warranty companies to HMOs, “trying to do the cheapest fix.”
How do I balance upfront costs against long-term operating costs?
When weighing upfront costs against long-term savings for your 2,300-square-foot home, consider your “breakeven point”, which is the time it takes for energy savings to offset the higher initial investment in a more efficient system. Most HVAC contractors can provide this analysis to help you make an informed decision.
How We Get Our HVAC Cost Data
Replacing an HVAC system is a large investment. Throughout this article, we estimated what it would cost to replace an HVAC system in a 2,300-square-foot home. Keep in mind: These are estimates intended to help you understand what a project like this might cost. You should get quotes from at least two companies to understand the true costs in your area.
We collected unit prices and the average cost of labor to calculate a total estimated price to replace an HVAC system in a 2,300-square-foot home. For unit costs, we collected wholesale prices for air condensers, electric furnaces, gas furnaces, evaporator coils, heat pumps, and air handlers from three sources, including: AC Direct, HVACDirect.com, and Buy Comfort Direct. We calculated prices for the total system using various combinations of unit costs. We also added an estimated retail markup. For labor, we researched the average time it takes to replace an HVAC system and multiplied this by the average cost of labor.
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