2022 Cost Guide for AC Units, Furnace, and HVAC System Replacements in San Antonio, Austin, and the Hill Country
AC unit, furnace, and HVAC systems replacement cost in San Antonio, Austin, New Braunfels, San Marcos, Boerne, and Kerrville.
- New AC Unit Cost – $3,200 to $4,200
- New Furnace Cost – $3,100 to $5,600
- Complete HVAC Cost – $6,000 to $9,300
- New Ductwork Cost – $164 Per Vent
- Blown-In Insulation Cost – $0.74 Per sqft
New Outside AC Unit Replacement Cost in San Antonio, Austin and the Hill Country
A new AC unit costs the average homeowner in San Antonio and Austin between $3,200 to $4,200 for the installation of a basic air conditioning unit. The pricing includes a basic 14 SEER single-stage air conditioner replacement. Keep in mind that the AC replacement cost is only for the outdoor unit. If you are interested in the cost of a complete system, you can find that information under this article’s HVAC Replacement Cost section.
| Outdoor AC Unit Tonnage | Electric AC Unit Cost 14 SEER | Heat Pump AC Unit Cost 14 SEER |
|---|---|---|
| 2 Ton AC Unit | $3,200 | $3,500 |
| 2.5 Ton AC Unit | $3,200 | $3,700 |
| 3 Ton AC Unit | $3,400 | $3,700 |
| 3.5 Ton AC Unit | $3,800 | $3,900 |
| 4 Ton AC Unit | $3,800 | $3,900 |
| 5 Ton AC Unit | $3,900 | $4,200 |
What's included in a new outdoor AC unit replacement?
- Removal & disposal of the current outdoor condenser.
- Installation of the new condenser to city code.
- Installation of a disconnect & whip, proper max circuit protection fuses, and locking caps.
- Line set flush to accommodate new refrigerant.
- 10-year parts warranty & 1-year labor warranty
What is the difference between a heat pump and a Gas/Electric outdoor AC unit?
Heat Pump AC Unit
A heat pump air conditioning unit works very differently from a gas/electric AC unit. A heat pump is used for both cooling and heating, while a gas/electric AC unit is only used for cooling and has nothing to do with the heating function of your AC system. Because a heat pump is used for heating and cooling, it contains more parts for the operation, making the installation in San Antonio and Austin a little higher in cost than a straight electric AC unit. You can count on Atlas AC Repair to deliver quality services if you want to replace a heat pump in Austin or San Antonio.
Electric AC Unit
There is no difference between gas or electric outdoor air conditioning units. The installation process and equipment are the same. An electric outdoor AC unit is a little cheap than a heat pump because an electric unit only cools, unlike a heat pump. Since an electric air conditioner only runs in the summer, it does not need to be made as durable as heat pumps. This lowers the replacement cost of a gas or electric AC unit in the San Antonio and Austin areas. If you are searching for a company to handle your AC replacement in Austin or San Antonio, give us a call, and we can help.
Outdoor AC unit pricing overview
Here is a quick recap covering the outside AC installation cost. A 2-ton AC unit price ranges from $3,200 to $3,500. A 2.5-ton AC unit price ranges from $3,200 to $3,700. A 3-ton AC unit price ranges from $3,400 to $3,700. A 3.5-ton AC unit price ranges from $3,800 to $3,900. A 4-ton AC unit price ranges from $3,800 to $3,900. A 5-ton AC unit price ranges from $3,900 to $4,200.
How much does a new indoor furnace cost to install in San Antonio, Austin and The Hill Country?
The cost for a furnace replacement in San Antonio and Austin can range from $3,100 to $5,600 for the installation of a basic 14 SEER furnace. Price varies so much because three different types of furnaces are commonly used in Texas. Before setting your budget, you will want to find out which one you have because of the significant differences in pricing.
| Indoor Furnace by Ton/BTU | Electric Furnace Cost | Heat Pump Furnace Cost | Gas Furnace Cost |
|---|---|---|---|
| 2 Ton Furnace Cost | $3,150 | $3,330 | $4,350 |
| 2.5 Ton Furnace Cost | $3,230 | $3,330 | $4,750 |
| 3 Ton Furnace Cost | $3,280 | $3,400 | $4,950 |
| 3.5 Ton Furnace Cost | $3,580 | $3,500 | $5,200 |
| 4 Ton Furnace Cost | $3,750 | $3,700 | $5,200 |
| 5 Ton Furnace Cost | $3,800 | $3,980 | $5,600 |
What's included in a new Indoor Furnace replacement?
- Removal & disposal of the current furnace.
- Installation of a new furnace to city code.
- Installation of heat kit elements, proper max circuit protection fuses, and safety float switches.
- Reconnection of drain line & proper attachment and sealing of plenum transitions.
- Line set flush to accommodate new refrigerant.
- Complete city permit & city inspection (if needed).
- 10-year parts warranty & 1-year labor warranty
Why does a gas furnace replacement cost more?
Gas Furnace Replacement
Heat Pump / Electric AC Unit
Although these two furnace types are a little different from each other, the material and labor costs are similar. This is why there isn’t much of a cost difference between the installation of a heat pump and an electric air-hander. Most zip codes in the San Antonio and Austin area do not require city inspections for these furnace types because there are fewer safety concerns, unlike gas furnaces. If you need a furnace replacement in Austin or San Antonio, start by giving us a call, and we can help.
What does an HVAC replacement cost in San Antonio, Austin, and the Hill Country? (Furnace and AC Unit Installed)
HVAC replacement costs the average homeowner between $6,000 to $9,300 for the installation of a basic HVAC system. This includes a 14 SEER new outdoor AC unit and a new furnace. The HVAC replacement cost in San Antonio and Austin will vary quite a bit depending on the system type you need. A gas HVAC system will be on the higher side, while an electric system will cost far less.
| HVAC System Size | Electric 14 SEER Replacement | Heat Pump 14 SEER Replacement | Gas 14 SEER Replacement |
|---|---|---|---|
| 2 Ton HVAC System Cost | $6,048 | $6,973 | $7,309 |
| 2.5 Ton HVAC System Cost | $6,536 | $7,275 | $7,720 |
| 3 Ton HVAC System Cost | $6,636 | $7364 | $8,200 |
| 3.5 Ton HVAC System Cost | $7,345 | $7,565 | $8,654 |
| 4 Ton HVAC System Cost | $7,406 | $7,873 | $8,800 |
| 5 Ton HVAC System Cost | $8,347 | $8,557 | $9,329 |
What Is Included In The Average AC System / Unit Cost?
- Removal & disposal of the current furnace & condenser.
- Installation of new furnace & condenser to city code.
- Installation of basic thermostat, heat kit elements, disconnect & whip, proper max circuit protection fuses, safety float switches, and locking caps.
- Reconnection of drain line & proper attachment and sealing of plenum transitions.
- Line set flush to accommodate new refrigerant.
- Complete city permit & city inspection (if needed).
- 10-year parts warranty & 1-year labor warranty
HVAC replacement cost overview for San Antonio and Austin
Here is a quick overview of an HVAC installation cost in Austin and San Antonio. A 2-ton HVAC system cost around $6,000 to $7,300. A 2.5-ton HVAC system cost ranges from $6,100 to $7,700. A 3-ton HVAC system will average from $6,400 to $8,200. A 3.5-ton HVAC system cost will be around $7,000 to $8,600. A 4-ton HVAC system cost will range from $ 7,300 to $8,800. On average, a 5-ton HVAC system costs from $7,300 to $9,300.
New Ductwork Cost
Ductwork is another one of those items on an HVAC system that doesn’t last forever. Sometimes rodents can get inside the attic and tear up the ductwork, it can start falling apart due to age, or if the vents get dirty inside the ducts, you can replace them cheaper than having them cleaned. Whatever the reason, the ideal time to replace your ductwork is when you replace your system, and it might be worth considering it at that time. If you are trying to set a budget to replace your ductwork, it will cost around $164 per duct replacement and around $476-$561 to replace a supply or return plenum.
| Options | Description | Average Cost |
|---|---|---|
| Duct Run | Per Duct Run Cost - Remove And Replace An Existing Duct Run | $164 |
| Supply Plenum | Remove Existing Supply Plenum And Rebuild A New 10' Section Supply Plenum | $561 |
| Return Plenum | Remove Existing Return Plenum And Rebuild A New 10' Section Return Plenum | $476 |
How to set a ductwork replacement budget
This will give you a reasonably accurate budget pending a site visit from one of our technicians to verify the ductwork’s current condition.
Blown In Attic Insulation Cost
If you are tired of high electricity bills in the summer, a cheap solution could be to have blown-in insulation put inside your attic. It only costs $0.74 a square foot to add R19 insulation to your attic, which will positively impact your electric bill.
| Options | Description | Average Cost |
|---|---|---|
| R19 Insulation | Blown-In R19 Attic Insulation | $0.74 Per SQFT |
| R30 Insulation | Blown-In R30 Attic Insulation | $1.00 Per SQFT |
How to budget for blown-in insulation
You’ve probably already guessed how to set a budget based on the above pricing. It’s as simple as multiplying the house’s square footage by the insulation’s square foot cost. For example, if you have a 1600 sqft home, you would follow this formula (1,600 x 0.74 = $1,184)
If you want to make a big difference in the amount you pay for your electric bill, you can go up to an R30 solution which is 1/3 more insulation than R19. It costs only a dollar a square foot, so if we use the 1600sqft example, the math will go like this (1,600 x 1.00 = $1,600)
AC Unit Add-Ons Cost
There are add-ons available for your HVAC system that might be worth considering. If you want to control your HVAC system from your phone, you can do that with a digital thermostat. If you have problems with electrical surges, you may want to consider adding a surge protector. Regardless of what you need, there are options on the market that could make all the difference.
| Options | Description | Average Cost |
|---|---|---|
| New Thermostat Line | Install A New T-Stat Line | $225 |
| Basic Thermostat | Install A New Basic Honeywell Thermostat | $150 |
| Digital Thermostat | Install A New Digital Honeywell Thermostat | $399 |
| Nest Thermostat | Install A New Nest Thermostat | $420 |
| Condenser Pad | Install A New Condenser Pad | $134 |
| Line Set | Install A New Line Set For A Single Story Home | $574 |
| Line Set (Double) | Install A New Line Set For A Double Story Home | $688 |
| Line Set Cover | Install A New 10 Foot Long Line Set Cover | $70 |
| Drain Line | Install A New 35 Foot Drain Line With Safety Switches | $216 |
| +- Surge Protector | Install A New Surge Protector | $110 |
Better Air Quality Cost
Millions of Americans struggle with air quality every year from allergies or asthma. Many homeowners are unaware that there are options for an AC system that can make a big difference in indoor air quality. You can add better filtration to remove air particles or install a UV light to address mold and other allergens. If you struggle with your home air quality, you might want to consider some of the options below.
| Options | Description | Average Cost |
|---|---|---|
| 2" Media Filter | Install A New Media Filter Cabinet with a 2" Media Filter | $172 |
| 4" Media Filter | Install A New Media Filter Cabinet with a 4" Media Filter | $440 |
| UV Light | Install A New UV Light In The Furnace | $287 |
| Duct Disinfectant | Flush All Ductwork With Duct Disinfectant | $59 |
| Carbon Monoxide Detector | Install A New Smoke / Carbon Monoxide Detector | $95 |
How much does a higher efficiency AC system Cost?
A new central AC unit cost can vary based on the SEER rating of the HVAC system. If you are asking how much a new AC unit costs in Texas, the short answer is that it can range from $6,800 to $16,800 based on the SEER you choose in San Antonio and Austin.
| AC Unit Tonnage | 14 SEER 1 Stage | 15 SEER 1 Stage | 16 SEER 2 Stage | 17.5 SEER 5 Speed | 22 SEER Variable Speed |
|---|---|---|---|---|---|
| 2 Ton HVAC Replacement | $7,309 | $7,427 | $9,785 | $12,024 | $16,504 |
| 3 Ton HVAC Replacement | $8,200 | $8,319 | $10,339 | $13,429 | $17,232 |
| 4 Ton HVAC Replacement | $8,800 | $8,919 | $11,417 | $14,390 | $17,601 |
| 5 Ton HVAC Replacement | $9,329 | $9,449 | $12,200 | $14,592 | $17,941 |
What is the Difference In AC stages?
The number of stages you have on your AC unit significantly impacts temperature consistency and humidity. The more stages you have, the more control you have over the air quality in your home.
Single Stage - Little Control
A single-stage AC unit operates at 100%; there is no in-between. Because it runs at 100%, the runtime is very short. It runs all out, hits the set temperature quickly, then shuts off. This is a good thing, right? Not necessarily. This creates a couple of problems not seen with multi-stage AC units.
Often, what happens with single-stage AC units is there ends up being a significant temperature discrepancy throughout your home. Some rooms can be much warmer or cooler than other rooms. This happens when the air is not allowed to distribute evenly throughout the home because the air conditioner reaches the set thermostat temperature too fast.
There is also a similar problem with humidity. Single-stage AC systems are not always able to regulate the humidity in your home due to the short-run cycle. The high humidity levels can damage your valuables if you have expensive furniture or art.
2 Stage - Some Control
A two-stage AC unit has two operating speeds. The first stage often operates around 65% compacity. The second stage operates at 100% compacity. When a 2-stage AC cools your home, it starts with the first stage at 65%. If the first stage is not able to cool your home, it kicks up to the second stage at 100%. This gives the 2-stage a longer run time than the single-stage, allowing it to do a much better job removing humidity and evening out the temperature in each room. This is a good option if you have a 2-story home.
Variable Speed - Total Control
5-speed and variable-speed AC units operate at multiple different outputs. They are designed to run constantly at the lowest speed. When the lowest speed setting can no longer keep your home at the temperature you set, the AC unit moves to the next higher speed until it hits the set temperature and then steps back down through the stages. In this way, the unit can control the temperature of your house within 1 degree. Because it runs for a long time on the lowest stage, you can set the desired humidity levels. These AC systems work great for large homes, homes with high ceilings, and homes with lots of rooms. These systems will also protect your artwork and expensive furniture while keeping your electric bill low. One thing to keep in mind is that AC repair costs are generally higher for variable-speed air conditioners.
What Does higher SEER save me?
New 14 SEER AC Unit vs. New High SEER Air Conditioning Unit.
- SEER rating concerns the energy efficiency of the air conditioning or cooling part of your AC unit. It does not apply to the heating part of your furnace. Generally speaking, the only SEER option that pays for itself is a 15 SEER AC unit over a 14 SEER AC unit. Once you factor in the rebate, it should have an ROI around five years. All other SEER options will not ROI, over the 14 SEER option in the San Antonio and Austin area, in the life expectancy of the AC system.
Your Existing AC Unit vs. New High SEER Air Conditioning Unit.
- However, if you compare your existing AC unit to a new higher SEER option, most of the time, it will ROI in the expected life of the AC unit. It all depends on whether you are interested in the best short-term or long-term value option.
Other considerations
- Solar is a big deal in San Antonio and Austin. If you have solar on your home or are planning on getting solar in the future, it makes sense to go up in SEER rating. The saving you would get from the reduced number of solar panels and batteries would be worth it.
- If you are environmentally conscious, it makes sense to go with the higher SEER option. Higher SEER options help lower your environmental footprint. High SEER options are also available that are not included in the chart.
Can you change your HVAC system type?
Gas HVAC System
If you currently have a gas system and need a new AC replacement, the most cost-effective solution is going back with a gas system.
If you are considering converting to an electric or heat pump AC, the most significant cost increase will come from upgrading your electrical for a new AC unit. Gas systems operate using 120v and draw far fewer amps than an electric or heat pump system. Electric and heat pump systems operate using 220v and draw more amps. The HVAC replacement cost increase to upgrade your electrical can range from $1000 to $2000.
Overall, a gas HVAC system in San Antonio and Austin will arguably deliver the best heating for your home.
Heat Pump HVAC System
You have two cost-effective AC install options if you currently have a heat pump system. You can go back with an electric or heat pump system without encumbering a high cost.
It will significantly increase the installation cost if you want to convert to a gas system. The reason for the large cost increase is due to the extra installations required. A plumber would need to install black pipe for the gas to your furnace. A roofer would be needed to help install the flue pipe for proper ventilation. An electrician needs to convert the voltage from 120v to 220v. All this extra work can double your furnace and AC unit installation cost in San Antonio and Austin.
Most homeowners choose to go back with a heat pump HVAC replacement in Austin and San Antonio because it is the most energy-efficient system on the market.
Electric HVAC System
If you currently have an electric system, you have the option to upgrade to a new heat pump AC unit without a large cost increase in San Antonio and Austin.
If you are looking to upgrade to a gas system, it’s going to cost quite a bit of prep to get your home ready for a gas unit, from running black pipe for the gas to upgrading your electrical to installing a flue pipe. All this extra work can more than double the cost of a new AC unit.
New straight electric AC installations in Austin and San Antonio are the most cost-effective solution; however, they use the most amount of electricity to operate.
Don't know which AC system type is in your home?
Receive an AC Replacement quote over the phone, text, or email. No site inspection is needed.
How long are you planning to live in your home?
Less Than 5 Year
If you plan on living in your home for less than five years in the San Antonio or Austin area, consider using a base model electric system or your cheapest option available unless you have solar on your home. A new AC unit generally does not increase the value of your home. A more efficient HVAC unit will not be able to ROI the cost difference in 5 years.
More Than 5 Year
If you plan on living in your home for more than five years in the San Antonio or Austin area, choose a gas or heat pump AC system. They are more energy-efficient than an electric AC unit and will pay for the increased up-front cost over time.
Is your house your primary residence or a rental property?
It's my primary residence.
A new gas or heat pump air conditioner is recommended for primary residences in San Antonio and Austin. They cost a little more than an electric AC unit but the quality and energy efficiency more than pay for themselves.
It's a rental property.
An electric air conditioner is recommended for rental properties in San Antonio and Austin. It’s normal to have many different tenants rent from you throughout the years. It only takes a few tenants forgetting to change the filters or otherwise neglecting the AC to greatly reduce the life of the AC system. In this case, putting in a more expensive AC unit doesn’t make much sense.
How well sealed and insulated is your home?
My home is poorly sealed and insulated.
If your home is poorly sealed and insulated, do your best to avoid a gas furnace. The outdoor air that enters and mixes with your indoor air increases the chance of carbon monoxide poisoning. So, it’s generally best to use a heat pump to eliminate the possibility of carbon monoxide poisoning. The heat pump’s energy efficiency will also help keep your electric bill lower than an electric system. This is great for areas like San Antonio and Austin.
My home is well sealed and insulated.
Any AC system will work well if your home is well-sealed and insulated. It might be best to use a gas or heat pump system to help maintain high energy efficiency for your home. However, you can use a gas, heat pump, or electric system; they will all perform well.
Do I have the right AC tonnage size?
Is my AC too small?
Owning an undersized AC system is very normal. When a general contractor builds a new house, they often look for ways to cut costs. One common practice is to lower the HVAC tonnage and use a smaller AC system than recommended. This forces the AC system to work overtime to cool or heat the home, shortening the overall life of the AC unit and increasing the electricity cost.
If your home is less than 20 years old, this is most likely the first time the AC system has needed to be replaced. Make sure load calculations are done to guarantee you have the right tonnage.
The install cost goes up around $100 to $500 for every ½ ton increase. Your AC company should have the software to check quickly and determine if your AC unit is undersized. This is usually a free service.
Is my AC too big?
This is not as common as undersized systems. It most commonly happens when an HVAC company overstocks certain system tonnages. They will start installing improperly sized AC systems to get rid of the excess inventory. In such cases, the AC system will reach the set thermostat temperature too fast. This doesn’t allow the system to run long enough to reduce the humidity in your home or give the time needed for the temperature of each room to even out properly. Some rooms will end up being warmer or cooler than others. More is not better when it comes to HVAC tonnage. Having the right size AC system for your home is very important.
There is one upside to having an oversized AC system. When it comes time to install a new AC system, you can save a few hundred dollars by getting the right size AC unit.
12 Things Every Homeowner Should Know Before Buying a New AC
The HVAC industry still operates like the wild west, and many homeowners are left to fend for themselves. Atlas AC created the AC Buyers Guide to prevent homeowners from being exploited by untrustworthy AC companies.
Use this guide to help you select the best AC Company for your next AC Replacement.
AC Systems We Install
Our Primary Brand
Atlas AC Repair primarily uses Carrier as our flagship AC system for new installation. We use Carrier as our main brand for a few reasons. 1) we needed a product that everyone knows and trusts in San Antonio and Austin, and 2) the more volume we run with Carrier, the lower our prices become, and we are able to pass those savings on to you. Carrier also does a great job covering all spectrums of air conditioning and heating, from cost-effective 14 SEER systems to the high-end 22 SEER AC systems. Carrier can handle any AC and heating solution you are looking for. We hand Carrier San Antonio and Austin.
Secondary Brands We Carry
We have great vendor relationships with Trane, Lennox, Goodman, Amana, and Comfortmaker. These brands also work well for the San Antonio and Austin area. However, we don’t run as much volume as we do with Carrier. Since our volume is lower with these brands, our cost is about 10% higher than for a Carrier. So if you are interested in a Trane, Lennox, Goodman, Amana, or Comfortmaker, we can definitely take good care of you. We handle Goodman San Antonio, Trane San Antonio, and Lennox San Antonio! If you are searching for a new ac unit cost Texas, please note it will run between $5,680 to $8,720 for a Carrier system.
Atlas AC Repair Service Area
San Antonio
Atlas AC Repair is based in north San Antonio, TX. San Antonio is a great city for many reasons, from the River Walk to all the small communities. Atlas AC Repair services all of Bexar County from Helotes to Live Oak, along with Castle Hills to Alamo Heights, down to Hidden Cove, to Brooks City Base. If you’re looking for the cost of a new AC unit or a complete AC installation in San Antonio, you have come to the right place. Atlas AC Repair is a proud HVAC San Antonio company providing air conditioning and heating repairs and replacement with 5-star service. You can always count on Atlas AC Repair for any AC replacement and AC repair in San Antonio! If you are located in this area and you’re looking for AC replacement cost San Antonio, it will cost around $5,680 to $8,720 for a basic system.
Austin
Even though we are based in San Antonio, we have technicians based in Austin, TX, that allow us to deliver speedy service. Austin is one of the most famous cities in Texas for good reasons. From the amazing trails to 6th street, Austin has it all! Atlas AC Repair not only services Austin but the surrounding areas as well. From Georgetown and Round Rock to Cedar Park and Pflugerville down to Sunset Valley and Del Valle, we have you covered in all the surrounding areas of Austin. If you’re searching for how much a new AC unit costs or the cost of a full air conditioning replacement in Austin, you found the right place to get pricing. HVAC replacement cost in Austin is going to run from $5,680 to $8,720 for a basic system. If you need a quick AC repair in Austin, we do that too! We are proud to service Austin and the surrounding areas!
New Braunfels And San Marcos
New Braunfels and San Marcos are just down the road from our main office in north San Antonio. We service all of Comal County and Hays County. If you live in the New Braunfels or San Marcos area and you’re looking for pricing for a new AC unit or the cost of a full air conditioner replacement, you came to the right place. Atlas AC Repair is proud to serve the people of New Braunfels and San Marcos.
Hill Country
We have technicians available to serve you in the Hill Country Area. We service most of the Hill Country area, including Boerne, Comfort, and Kerrville. The Hill Country is one of the most beautiful places in Texas. If you’re trying to find out the cost of a new air conditioner unit or a full AC replacement in Boerne, Comfort, or Kerrville, you have come to the right place. We are proud to serve the Hill country!
Alamo Heights
Balcones Heights
Castle Hills
China Grove
Converse
Elmendorf
Fair Oaks Ranch
Grey Forest
Helotes
Hill Country Village
Hollywood Park
Kirby
Leon Valley
Live Oak
Olmos Park
San Antonio
Selma
Shavano Park
Somerset
Terrell Hills
Universal City
Von Ormy
Bulverde
New Braunfels
Austin
Bee Cave
Cedar Park
Creedmoor
Elgin
Jonestown
Lago Vista
Lakeway
Leander
Manor
Mustang Ridge
Pflugerville
Rollingwood
Round Rock
Sunset Valley
West Lake Hills
Buda
Dripping Springs
Hays
Kyle
Mountain City
Wimberley
Woodcreek
12 Things Every Homeowner Should Know Before Buying a New AC
The HVAC industry still operates like the wild west, and many homeowners are left to fend for themselves. Atlas AC created the AC Buyers Guide to prevent homeowners from being exploited by untrustworthy AC companies.
Use this guide to help you select the best AC Company for your next AC Replacement.
Brands we service
We service all air conditioner brands and install these leading brands in San Antonio, Austin, and the Hill Country.
Additional Home Air Conditioner Pricing
A home AC unit can cost between $3,300 to $4,100, depending on the size of your air conditioner. A 2-ton AC unit costs from $3,300 to $3,500. A 2.5-ton ac unit cost from $3,300 to $3,600. A 3-ton AC unit cost from $3,400 to $3,700. A 3.5-ton AC unit cost from $3,500 to $3,800. A 4-ton AC unit costs from $3,700 to $3,900. A 5-ton AC unit cost from $3,800 to $4,100.