How much does AC installation cost in Katy, TX in 2026?

Most central AC installations in Katy run $4,000 to $14,000 or more, depending on tonnage, efficiency, and ductwork. A 3-ton single-stage system sits at the low end; a 4 to 5-ton variable-speed system at the high end. The shift to R-454B refrigerant raised 2026 equipment prices roughly 15 to 30 percent, and a qualifying CenterPoint rebate can offset part of it.

What size AC do I need for my Katy home?

It's set by a Manual J load calculation, not square footage alone. A typical 2,000 square foot Katy home usually lands around 3.5 to 4.5 tons, but the load calc decides based on insulation, windows, orientation, and ceiling height. Katy systems run more than 2,000 cooling hours a year, so correct sizing matters more here than in cooler climates.

How long does AC installation take? Will it be done in one day?

A standard system changeout takes about four to eight hours and is finished the same day. A full system that also needs ductwork or electrical changes can run one to two days. We give you a real timeline at the estimate, not a vague "sometime this week."

Do I need a permit to replace my AC in Katy, TX?

Yes, a mechanical permit is required. Because Katy spans Harris, Fort Bend, and Waller counties, the issuing office depends on your exact address. We pull the correct permit and handle the inspection. Fees typically run $100 to $300, and the documentation matters if you sell the home later.

What SEER2 rating do I need for Katy in 2026?

The Texas minimum is 14.3 SEER2 for new split systems (DOE South region). For Katy's long, hot season, we recommend 16+ SEER2. If a quote on 2026 equipment still uses the old "SEER" number instead of SEER2, ask the contractor to clarify what you're actually buying.

Are there rebates for a new AC installation in Katy in 2026?

CenterPoint Energy offers up to $500 on a qualifying ENERGY STAR heat pump plus $75 for a smart thermostat. The federal Section 25C credit expired December 31, 2025, and Texas's HEAR program has not opened yet, so CenterPoint is the live path this year. We'll show you which systems qualify.

Should I replace just the outdoor condenser or the whole system?

On 2026 equipment, the whole matched system. New R-454B condensers aren't compatible with the older R-410A indoor coils, so a half-swap mixes refrigerants, voids the warranty, and loses the rated efficiency. A proper replacement is a matched pair certified by AHRI.

Is a variable-speed AC worth the extra cost for Katy's humidity?

For most Katy homes, yes. A variable-speed system runs longer at low capacity, removing roughly 30 percent more moisture than a single-stage unit. In Katy's 75 to 85 percent summer humidity, that's the difference between cold-and-clammy and genuinely comfortable, and it usually lowers the bill too.

Do you serve Cinco Ranch, Kelliwood, Firethorne, Elyson, and other Katy neighborhoods?

Yes. We install across 77449, 77450, 77493, and 77494, including Cinco Ranch, Kelliwood, Firethorne, Seven Meadows, Elyson, Cane Island, Falcon Landing, Tamarron, and Bear Creek. We dispatch from our Houston headquarters and reach most of Katy in 30 to 45 minutes by I-10 or the Grand Parkway.

How do I know if my Katy new-build's AC is oversized?

Watch for short cycling (the system turns on and off every 10 to 12 minutes), indoor humidity above 55 percent, and uneven cooling room to room. Oversized builder-grade systems are common in newer Cinco Ranch, Firethorne, and Elyson homes. The fix is right-sizing through a Manual J, usually paired with a variable-speed system.

AC Installation in Katy, TX: New Systems, Full Replacement & Free On-Site Estimates

Looking for dependable HVAC services in Katy, TX? 75 Degree AC delivers expert air conditioning, heating, and indoor air quality solutions for homes and businesses, helping you stay comfortable in every season.

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AC Installation in Katy, TX

75 Degree AC installs and replaces central air conditioning systems across Katy, TX, covering ZIP codes 77449, 77450, 77493, and 77494 in Harris, Fort Bend, and Waller counties. Founded in Houston in 2016 and licensed Class A (TACLA72152E, no tonnage ceiling), the company sizes every system with a Manual J load calculation and installs an AHRI-certified matched pair. Most Katy installations cost $4,000 to $14,000 or more depending on tonnage and whether the system is single-stage or variable-speed; 2026 equipment using R-454B refrigerant runs roughly 15 to 30 percent more than older R-410A units. Texas requires a minimum 14.3 SEER2 on new split systems, and 16+ SEER2 is recommended for Katy’s 102 days a year above 90°F. CenterPoint Energy rebates up to $500 on a qualifying heat pump plus $75 for a smart thermostat apply in 2026; the federal 25C credit expired December 31, 2025. Free estimates. Call (713) 598-2737.

Replacing an AC is the most expensive thing most Katy homeowners will buy for the house this year. The hard part isn’t picking a brand. It’s knowing whether the number you were quoted is honest, whether the unit is the right size, and whether you’re being sold a system you don’t need. So that’s where this page starts.

What Does AC Installation Cost in Katy in 2026?

Most central AC installations in Katy run $4,000 to $14,000 or more, depending on tonnage, efficiency, and whether your ductwork needs work. That's a wide range, and the spread is the whole point: a 3-ton builder-grade swap and a 5-ton variable-speed system are different purchases. Here are the typical 2026 Katy market ranges, not a fixed price list.

System tier	Typical Katy installed cost (2026)	SEER2	Best for
3-ton single-stage	$4,000 to $7,000	14.3 to 15	Smaller homes, builder-grade replacement
4-ton, two-stage	$5,000 to $9,000	15 to 16	Most 2,000 to 2,800 sq ft Katy homes
4 to 5-ton variable-speed	$8,500 to $14,000+	16 to 20+	Humidity control, two-story, max efficiency

What moves your price within those tiers:

Tonnage (the result of your Manual J load calculation, not a guess)
SEER2 tier and single-stage vs variable-speed
Ductwork that needs sealing, resizing, or replacement: $1,500 to $4,000
Line set, electrical, or panel work: $500 to $2,000
Mechanical permit: $100 to $300
Old-system removal and disposal, and whether it's a one or two-story home

Real numbers from recent Katy jobs make the ranges concrete: about $14,500 for a full system replacement on a 16-year-old Cinco Ranch home, $9,200 on an Elyson new-construction coil-and-refrigerant job, and $7,800 in Firethorne where the ducts needed rework.

One more piece. CenterPoint Energy offers up to $500 on a qualifying ENERGY STAR heat pump plus $75 on a smart thermostat in 2026. We'll show you which systems qualify before you buy. The old federal Section 25C tax credit expired December 31, 2025, so any Katy contractor still advertising a $2,000 federal credit is working from old information.

These are 2026 Katy market ranges. Your exact number comes from a free in-home estimate after we run the Manual J. No guessing over the phone.

Call (713) 598-2737 for a free in-home estimate.

What Size AC Does Your Katy Home Need?

The right size comes from a Manual J load calculation, the ACCA-standard method that figures your home’s actual heat gain from square footage, insulation, window count and orientation, ceiling height, and how many people live there. A typical 2,000 square foot Katy home usually lands around 3.5 to 4.5 tons, but the load calc is what decides, not a rule of thumb off the old unit’s label.

This matters more in Katy than almost anywhere. An oversized system blasts the house cold, satisfies the thermostat, and shuts off before it has run long enough to pull the humidity out of the air. You end up at 74°F and still feel swampy, and the compressor wears out early from all that stopping and starting. An undersized system does the opposite: it runs nonstop through a Katy August, never quite catches up, and burns out in three or four summers.

If a competitor’s quote doesn’t mention a Manual J, ask how they sized your system. The honest answer is the difference between comfort for fifteen years and a callback every summer.

Which AC Brand and Model Should You Install?

We aren't locked into one manufacturer, so the recommendation fits your home and budget instead of a factory quota. Here are the specific current models we install and service, by brand.

Brand	Premium model	Value model	SEER2 range	Compressor	Warranty (registered)
Carrier	Infinity 24ANB7	Performance 17	16 to 20+	Variable / dual	10-yr parts
Trane	XV20i	XR16	16 to 21.5	Variable TruComfort	10-yr parts
Lennox	SL28XCV	EL16XC1	16 to 28	Variable / single	10-yr parts
Goodman	GSXC18	GLXS5BA	14.3 to 19	Single / dual	10-yr parts
Daikin	DX20VC Fit	DX16TC	16 to 23.5	Variable inverter	12-yr parts

We also install American Standard Platinum 20 and Rheem Prestige RA20. For room additions, garages, and the bonus rooms common in Cinco Ranch and Seven Meadows homes, a Mitsubishi M-Series ductless unit cools a single zone without extending ductwork.

Two things we'll always explain. Every system we install is an AHRI-certified matched system, which is what holds your rated SEER2, your manufacturer warranty, and your rebate eligibility. And every new system we install uses current refrigerant, R-454B or R-32, not phased-out R-410A.

What SEER2 Rating Is Right for Katy's Heat?

SEER2 is the efficiency number, and it replaced plain SEER when the Department of Energy updated its test in 2023. The two scales aren’t identical, so a quote that still says “14 SEER” is quoting an old standard. Texas sits in the DOE South region, where new split systems must meet a minimum of 14.3 SEER2. For Katy, we usually point people toward 16+ SEER2.

The reason is the season length. Katy runs a cooling season close to seven months, with 102 days a year at or above 90°F. A higher-efficiency system pays back faster here than it would in a cooler climate, because it’s working far more hours.

There’s also a comfort argument that has nothing to do with the bill. A variable-speed system runs longer at low capacity instead of slamming on and off. Those longer, gentler cycles pull more moisture out of the air, which is what you want in Katy’s 75 to 85 percent summer humidity. It’s the difference between a house that’s cold and a house that’s actually comfortable at 74°F.

R-410A or R-454B: What Changed in 2026?

The refrigerant rules shifted, and it's worth understanding because it affects both your cost and your options.

New equipment manufactured since January 1, 2025 uses R-454B (Carrier calls it Puron Advance) or R-32, both A2L refrigerants, instead of the older R-410A. Under the EPA's final rule effective July 27, 2026, pre-2025 R-410A inventory can still be installed until it's depleted, so a contractor isn't breaking any rule by installing leftover stock. But that's not usually the smart buy on an aging system.

Refrigerant	Status	GWP	What it means for you
R-22	Phased out (legacy)	1,810	1990s–2000s systems; recharge $80–$150/lb
R-410A	No longer manufactured; existing stock installable	2,088	Service cost rises as supply tightens
R-454B / R-32	Current (2025+ equipment)	466 / 675	What new systems use; ~15–30% higher equipment cost

Here's the part that surprises people. If your old system runs R-410A and the outdoor unit fails, you can't just bolt a new R-454B condenser onto the old indoor coil. The refrigerants aren't compatible, and mixing them voids the efficiency rating and the warranty. That's why a true replacement on a 2026 system is a matched pair, not a half-swap. And the A2L equipment premium, roughly 15 to 30 percent over comparable 2024 units, is the real reason installation prices climbed.

Are There Rebates for a New AC in Katy?

Yes, and the picture changed for 2026, so it’s worth getting straight.

CenterPoint Energy offers up to $500 on a qualifying ENERGY STAR heat pump plus $75 on a smart thermostat, up to about $575 combined. We’ll show you which systems qualify when we quote.
The federal Section 25C tax credit expired December 31, 2025. It cannot be claimed on a 2026 installation. Any Katy contractor still advertising a $2,000 federal credit is using old information.
Texas’s HEAR program is funded but has not opened applications as of June 2026.
Financing is available with 0% APR options on approved credit, so the up-front number doesn’t have to be the whole story.

The honest version: CenterPoint is the live incentive in 2026. We’ll walk you through what qualifies rather than promise a credit that no longer exists.

How Our Katy AC Installation Works, Step by Step

Free in-home estimate and Manual J load calculation

We size the system by the math, not by the label on the old unit. You see the load number alongside the equipment quote.

Equipment selection (Manual S)

We match tonnage and SEER2 to the load and to your budget tier. If your current system is actually salvageable, we'll tell you and quote repair against replacement side by side.

Scheduling and prep

Most installs are booked within a few days, and a standard changeout is a one-day job. For August jobs, we route around the Katy ISD calendar so families with kids home aren't waiting.

Installation day

We remove the old system, set the new condenser and matched coil or air handler, run the line set, handle the electrical, and set the thermostat.

AHRI verification and commissioning

We verify the charge, check static pressure, balance the airflow, and confirm the matched-system rating, so the system actually performs at the number on the sticker.

Permit sign-off and warranty registration

We pull the correct Katy mechanical permit and register your equipment inside the manufacturer's window, so your full 10-year parts warranty holds.

When Should You Replace Instead of Repair?

Repair usually wins on a younger, healthy system. Replacement enters the conversation when the math tips. A straightforward way to think it through:

Run the $5,000 rule. Multiply the system’s age by the repair cost. If the result clears $5,000, replacement usually makes more sense. A 12-year-old unit needing a $700 repair is a $8,400 signal.
Count the recent repairs. Two or more service calls in the last two years means you’re funding a new system one part at a time.
Check the refrigerant. If your Cinco Ranch or Kelliwood system still runs R-22, every recharge costs more than the last, $80 to $150 a pound, $300 to $600 a visit. That’s the trap.
Look at what failed. A capacitor or a contactor is a repair. A failed compressor or a leaking coil on an aging R-410A system is where replacement makes sense, because of the matched-system rule above.
Factor in the rebate. A qualifying CenterPoint rebate can tip a close decision.

We quote repair and replacement side by side and put the numbers in writing. We don’t make more money by selling you a new system, so the recommendation is the one the math supports.

Why Do New Katy Homes Have Humidity Problems?

This one catches a lot of Elyson, Cane Island, Firethorne, and Tamarron homeowners off guard. The house is only a few years old, the AC is “working,” and yet the upstairs sits at 68 to 70 percent humidity at 70°F all summer.

The usual cause is an oversized builder-grade system. Production builders often install a single-stage 14.3 SEER2 unit that’s a half-ton too big for the actual load. It cools fast, short-cycles on and off every 10 to 12 minutes, and never runs long enough to dehumidify. So the air is cool and clammy at the same time.

The signs to look for: short cycling, indoor humidity above 55 percent, and uneven cooling room to room. The fix is right-sizing through a Manual J and, in most cases, a variable-speed system that runs longer and gentler. It’s not a bigger unit you need. It’s the right one.

Which Katy Neighborhoods and ZIPs Do You Serve?

Katy is unusual. The same "Katy, TX" address can sit in Harris, Fort Bend, or Waller County, and the city limits thread through all three. We install across all of it.

Neighborhood	ZIP	County	Install context
Cinco Ranch	77450 / 77494	Harris / Fort Bend	1990s–2000s stock; R-22 trap; full replacements
Kelliwood	77450	Harris	1980s–90s gated; aging systems
Firethorne	77494	Fort Bend	Newer builds; builder-grade oversizing
Seven Meadows	77494	Fort Bend	Resort-style MPC; bonus-room ductless
Elyson	77493	Harris	New construction; warranty-expiry window
Cane Island	77493	Harris	2018+ builds; humidity-oversizing
Falcon Landing / Tamarron	77494	Fort Bend	Established plus Katy/Fulshear-edge new builds
Bear Creek / Westfield	77449	Harris	Older stock; R-22; full replacement

We dispatch from our Houston headquarters and reach most of Katy in 30 to 45 minutes by way of I-10 or the Grand Parkway (TX-99). There's no Katy storefront, but the crews work the west side, and we've known these neighborhoods, gate codes, and HOA rules since 2016.

Do You Need a Permit to Replace Your AC in Katy?

Yes. A mechanical permit is required to replace a system, and because Katy spans three counties, the office that issues it depends on exactly where your home sits. We pull the right one for your address and handle the inspection, so you aren't chasing paperwork, and so the install survives a future home sale. Permit fees typically run $100 to $300.

Where your home sits	Permit authority	Phone
Inside City of Katy limits (much of 77493)	City of Katy Building Permits, 901 Avenue C	(281) 391-4830
Unincorporated Harris County (77449, parts of 77450)	Harris County Office of the County Engineer	(713) 274-3232
Unincorporated Fort Bend County (77494, parts of 77450)	Fort Bend County Engineering, Richmond	(281) 633-7500
Western 77493 fringe	Waller County, Hempstead	(979) 826-7600

Why Katy Homeowners Choose 75 Degree AC

Licensed Class A, verifiable

75 Degree AC holds Texas license TACLA72152E, a Class A license with no tonnage ceiling. Verify it yourself on the TDLR public registry in about 30 seconds. (Worth knowing: some Katy installers hold a Class B license, which is restricted to systems under 25 tons.)

Sized by the math

Every quote starts with a Manual J load calculation, shown to you alongside the equipment.

A named, credentialed lead tech

Lead technician Kenny Ho is NATE-certified and holds EPA Section 608 Universal certification, and every tech we dispatch carries EPA 608, required to handle R-454B and R-32. *(Verify roster before publish.)*

A free written second opinion

If another company handed you a replacement quote you're unsure about, we'll give you a straight second opinion in writing. *(Confirm standing policy before publish.)*

We pull the permit

The correct Katy mechanical permit and inspection, handled for you.

AHRI matched systems, warranty registered for you

Your rated efficiency and 10-year parts warranty stay valid.

Stocked trucks, one-day installs

Most Katy changeouts finish in a single day.

5.0 stars

We also serve Richmond, Cypress, and Sugar Land, so our Richmond TX HVAC team covers the Fort Bend side too.

What Katy Customers Say

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Same-day repair with up-front, written pricing.

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Keep your system efficient through Katy summers.

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24/7 dispatch for no-cool emergencies.

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Serving Richmond and the Grand Parkway too.

Get a Free AC Installation Quote in Katy: Call (713) 598-2737

Whether your Cinco Ranch system finally gave out, your Elyson home never quite dries out, or you just want a straight second opinion on a quote that felt high, you can talk to a licensed technician today. Free in-home estimate, Manual J sizing included, and a written quote before any work begins.

Call (713) 598-2737. 75 Degree AC, TACLA72152E (Class A), installing AC systems across all of Katy, TX.