Choosing a system
Central air without ductwork: ducted vs ductless
A house without ducts has two routes: install ductwork and a central system, or install a ductless mini-split. In Dallas, new ducts for about 2,000 square feet are published at $6,000–$7,000 on top of the system, and a single-zone mini-split at $2,000–$5,200 installed. For one to three rooms, ductless usually costs less; for a whole house, price both.
On this page (14)
- At a glance
- The two routes, explained
- Ducted vs ductless, side by side
- What each route costs in Dallas
- Worked example: pricing both routes
- Five questions that decide it
- Why attic ducts matter in a Dallas summer
- Mixing both: the hybrid many homes end up with
- Sizing applies to both routes
- Living with each system
- Common mistakes
- Getting comparable quotes
- Sources
- Questions
At a glance
All figures on this page are published third-party ranges, labeled by geography. They are not this site’s prices, and this site does not install systems. Use them to sanity-check quotes, not to replace them.
The two routes, explained
New ducts + central system
One outdoor unit, one indoor air handler or furnace, and a network of supply and return ducts carrying air to every room. Equipment and ducts are hidden in the attic or a closet. New ducts: $6,000–$7,000 (Dallas, undated page), plus the system itself.
Ductless mini-split
An outdoor unit connected by a small refrigerant line set to one or more indoor heads, each mounted in the room it serves. No ducts. One zone: $2,000–$5,200; two zones: $4,500–$8,000; three zones: $6,500–$12,000 (Dallas and DFW).
Both are split systems: a compressor outside, a cold coil inside, refrigerant moving heat between them. The difference is how the cooled air reaches you. A central system cools air at one coil and blows it through ducts. A mini-split puts a small coil and fan in each room, so the only thing traveling between rooms is refrigerant in copper tubing.
That one design difference drives almost everything else on this page: cost, how much of the house gets torn into, how zoning works, what you see on the walls and how many filters you clean.
Ducted vs ductless, side by side
| Factor | Ducted central system | Ductless mini-split |
|---|---|---|
| Needs ducts | Yes, supply and return | No |
| Published cost, Dallas/DFW | System plus $6,000–$7,000 for new ducts (about 2,000 sq ft) | $2,000–$5,200 one zone; $6,500–$12,000 three zones |
| Zoning | One zone unless dampers and extra controls are added | Each head has its own setpoint |
| Visible indoors | Ceiling or wall vents and a return grille | A head on the wall (or ceiling cassette) in each room |
| Air filtration | One filter at the return; room for a thicker media filter | A washable screen in every head |
| Heating | Pairs with a gas furnace or is itself a heat pump | Most models are heat pumps |
| Duct losses | About 20 to 30 percent of the air moving through a typical duct system is lost to leaks, holes and poorly connected ducts. | None, because there are no ducts |
| Disruption to install | Attic work, ceiling cut-ins for each register | A small hole through the wall per head |
| Best fit | Whole house, especially with good attic access | One to three rooms, additions, conversions, homes with no attic space |
The short version
For a few rooms, ductless is usually cheaper and faster. For a whole house, a multi-zone mini-split can approach the cost of new ducts plus a central system, so the decision turns on access, looks and how you want to control each room.
What each route costs in Dallas
There is no single price for "central air without ductwork" because the route changes the bill. The published figures below come from named third-party sources; the source list at the end of this page gives each one with its date.
| Item | Published range | Geography and note |
|---|---|---|
| Single-zone mini-split, installed | $2,000–$5,200 | Dallas, Filterbuy (an equipment seller), page dated 2026-08-07 |
| Two-zone mini-split, installed | $4,500–$8,000 | Dallas, Filterbuy |
| Three-zone mini-split, installed | $6,500–$12,000 | Dallas and DFW, Filterbuy and RFP Homes |
| New ductwork, about 2,000 sq ft | $6,000–$7,000 | Dallas, HVAC.com, undated page; treat as indicative |
| 3-ton central AC on existing ducts | $5,500–$16,500 | DFW, consolidated from published 2026 contractor guides |
| Duct sealing or repair | $1,300–$8,000 | Dallas, Budget Heating; sealing through partial replacement |
| Panel upgrade, 100 A to 200 A | $1,800–$3,500 | National, Voltflow; only if the panel lacks capacity |
| Dallas permit and inspection, mini-split | $300–$900 | Dallas, as published by the seller; confirm the fee with the city |
No published four-zone or whole-house mini-split figure was found for Dallas when this page was checked, so none is shown. If a quote covers four or more heads, compare it against the per-zone pattern above and ask the contractor to itemize.
Worked example: pricing both routes
The numbers below are illustrative arithmetic on the published ranges, not a quote. Say a 1,900 sq ft 1950s pier-and-beam house in East Dallas has window units and a wall furnace, and no ducts at all.
- Ducted route. New ducts for a home of about 2,000 sq ft are published at $6,000–$7,000. The equipment on top is harder to pin down: the DFW 3-ton figure of $5,500–$16,500 assumes existing ducts and includes labor. Adding the two gives a rough band of $11,500 to $23,500, before any panel work or a furnace.
- Ductless, whole house. Three zones are published at $6,500–$12,000. A 1,900 sq ft house with three bedrooms and an open living area may need four or more heads, and no Dallas figure for that was found. Expect the quote to run above the three-zone band.
- Ductless, partial. If the owner only wants the living area and main bedroom cooled, two zones at $4,500–$8,000 might cover it, with window units or fans elsewhere.
- Electrical. Either route may need a new circuit. If the panel is a small older one, a 100 A to 200 A upgrade is published at $1,800–$3,500 nationally.
The lesson is not which number is lower. It is that the two routes answer different questions: the ducted route buys whole-house air from one system, while the partial ductless route buys targeted comfort for less. Decide which question you are asking before comparing totals.
Five questions that decide it
- How many rooms need cooling? One or two rooms favor ductless almost every time. Whole-house can go either way.
- Is there attic space for duct runs? Most DFW ranch homes have an attic, but a low-slope roof, a finished attic or a two-story house without chases between floors makes ducts harder and more expensive.
- What heats the house now? Most mini-splits are heat pumps, so they can replace wall furnaces or space heaters. A ducted system can be a heat pump or pair with a gas furnace.
- How do you feel about wall heads? Some owners dislike a visible unit in each room. Ceiling cassettes and slim ducted mini-split air handlers exist; ask whether they suit the room.
- How long will you stay? If you may sell, ask a local real estate agent how a ductless house compares with ducted homes in your neighborhood before treating it as a whole-house answer.
For a structured side-by-side using your own answers, try the AC system comparison tool.
Why attic ducts matter in a Dallas summer
ENERGY STAR estimates that about 20 to 30 percent of the air moving through a typical duct system is lost to leaks, holes and poorly connected ducts. In a Dallas home, ducts usually run through the attic, which gets much hotter than the outdoor air on a sunny summer afternoon. A leak there either pushes cooled air into the attic or pulls attic air into the return. Uninsulated or poorly insulated runs also gain heat along their length.
DFW averages 20 days a year at or above 100 °F on the 1991–2020 normals, two more than on the 1981–2010 normals. Those are exactly the days when duct losses cost the most. That is one honest advantage of ductless: there is no duct to leak. The fair counterpoint is that new ducts, sealed and insulated to current code, perform far better than the old, leaky runs many people picture.
If a ducted quote is on the table, ask how the ducts will be sealed and insulated, and whether the contractor will test for leakage. Ductwork replacement and sealing covers the options.
Mixing both: the hybrid many homes end up with
Many DFW homes already have central air but a room the ducts never reached well: a garage conversion, a sunroom, a room over the garage, an addition or a backyard office. Extending ducts to it can starve the rest of the system or overload it. A single-zone mini-split for that room leaves the central system alone.
At $2,000–$5,200 for one zone in Dallas, a mini-split is often less disruptive than a new duct branch for a room the original system was not designed to carry. See mini-split installation for zone pricing and hot and cold rooms if the problem is a room that has ducts but never cools.
| Situation | Usual direction | Why |
|---|---|---|
| Whole house, no ducts, good attic | Price both; ducted often wins for whole-house air | One system, hidden equipment, one filter |
| Whole house, no ducts, no attic or chases | Ductless | Duct runs would mean opening walls and ceilings |
| Central air works, one room never cools | Check ducts first, then a single zone | The duct may be the problem, not capacity |
| Garage conversion or addition | Single-zone mini-split | The original system was not sized for it |
| Two or three rooms only | Multi-zone mini-split | Cheaper than ducting the house |
Sizing applies to both routes
Dallas enforces the 2021 International Residential Code and 2021 IECC with Dallas amendments, effective 12 May 2023. The IRC requires equipment to be sized from a load calculation (ACCA Manual J) rather than a rule of thumb. ACCA Manual J (ANSI/ACCA 2, 8th edition) is the American National Standard for residential heating and cooling load calculation. That applies to a mini-split head as much as a central system, and arguably more: an oversized head in a small bedroom cools fast, shuts off and leaves the room clammy.
A good ductless quote sizes each head to its room. A good ducted quote sizes the system to the whole house and the ducts to each room's share of it. In both cases ask for the load result in writing. What size AC a Dallas home needs and oversized AC problems go deeper.
Living with each system
Ducted
- One filter to change at the return, on a schedule.
- Equipment and ducts out of sight.
- One thermostat unless zoning is added.
- Duct condition matters for the life of the system.
Ductless
- A washable screen in every head, cleaned regularly.
- Indoor coils and blower wheels need periodic cleaning; ask what the contractor recommends.
- Each head is controlled separately, often by remote or app.
- Condensate drains from each head must stay clear.
Neither is maintenance-free. The ductless burden is more frequent but simpler; the ducted burden is less frequent but includes ducts you cannot easily see.
Common mistakes
- Comparing a one-zone mini-split price with a whole-house ducted price. They solve different problems. Compare like for like.
- One big head for an open-plan house. Air from a wall head does not turn corners well; closed bedrooms off a hallway may stay warm.
- Ignoring the electrical panel. Ask early whether a new circuit or panel upgrade is needed, so it is not a surprise mid-job.
- Line sets run across the front of the house. Ask where the refrigerant lines and covers will run outside, and agree it before work starts.
- Skipping the permit. A mini-split is mechanical work in Dallas like any other system. See the permits guide below.
- Adding ducts without sealing them. New ducts should be sealed and insulated; ask how, in writing.
Getting comparable quotes
Ask each contractor for both designs on the same visit, so you are comparing one set of assumptions.
- A ducted design: equipment model numbers, duct layout, register locations, how ducts are sealed and insulated.
- A ductless design: number of heads, capacity of each, where each head and the outdoor unit go, line-set route.
- The load calculation behind both.
- Electrical work: new circuit, disconnect, any panel upgrade.
- The permit, pulled by the licensed contractor. Dallas AC installation permits explains the process.
- Warranty terms for equipment and labor, and whether registration is included.
Then check the license on the TDLR lookup and line the quotes up in the quote-comparison tool.
Sources
- Filterbuy, Dallas mini-split installation (an equipment seller) (Dallas, page dated 2026-08-07) (retrieved 2026-10-20)
- RFP Homes, choosing an HVAC system for a DFW rental (DFW, page dated 2026-07-02) (retrieved 2026-10-20)
- HVAC.com, HVAC replacement costs in Dallas, TX (Dallas, page dated 2024-05-22) (retrieved 2026-10-20)
- Budget Heating, AC replacement cost in Dallas (Dallas, page dated undated) (retrieved 2026-10-20)
- Voltflow, electrical panel upgrade cost 2026 (National, page dated 2026-04) (retrieved 2026-10-20)
- ENERGY STAR, "Duct Sealing" (retrieved 2026-10-20)
- NWS Fort Worth, "1991–2020 Normals" (retrieved 2026-10-20)
- City of Dallas, "Current City Code" (retrieved 2026-09-23) — verify before relying on it
- ACCA, Manual J (retrieved 2026-10-20)
- Cold Factor Heating & Air (Flower Mound, TX) (page dated 2026) (retrieved 2026-09-23)
- HVAC Services Pro (DFW) (page dated 2026-04-13) (retrieved 2026-09-23)
- HVAC Services Pro, DFW installation guide (page dated 2026-03-06) (retrieved 2026-09-23)
- HVACProjectCost.com, Dallas page (page dated 2026-08-02) (retrieved 2026-09-23)
Questions
Is a mini-split cheaper than adding ducts?
For one or two rooms, usually: a single zone is published at $2,000–$5,200 in Dallas. For a whole house, several zones can approach the cost of new ducts plus a central system. Price both.
Can ducts be added to a slab home?
Often through the attic, with drops into each room. Whether it is practical depends on attic space, roof pitch and wall chases, and a contractor needs to see the house.
Can a mini-split cool a whole Dallas house?
It can, with enough heads sized from a load calculation. Rooms behind closed doors usually need their own head, because air from one wall unit does not travel well around corners.
Do mini-splits heat as well as cool?
Most are heat pumps, so they heat and cool. Check the model on the quote and ask how it performs in the coldest weather you expect.
Does a mini-split need a permit in Dallas?
It is mechanical work, so plan on one. A seller publishes $300–$900 for a Dallas mini-split permit and inspection; confirm the current fee with the city.
Is ducted or ductless more efficient?
Ductless avoids duct losses entirely, which matters in hot attics. A well-sealed new duct system narrows the gap. Compare the rated efficiency of the specific models quoted.
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