What a $13,900 Houston AC Replacement Quote Actually Pays For, Line by Line

A Pearland homeowner sent me two quotes last month for the same 3.5-ton replacement. One was $10,400. The other was $13,900. Both listed "16 SEER2 system, new coil, new pad, warranty." Neither said a word about the duct system, the permit, or how anyone had decided 3.5 tons was the right size for a 2,100-square-foot 1998 build. That gap, $3,500 for two paragraphs that look identical, is what this post takes apart.

I'm using the higher number because it's the more common Houston-area figure when a company sends a salesperson to the house instead of quoting from a phone call. Our HVAC hub has the national picture and the Texas HVAC guide covers the state; this one is about where the money in a Gulf Coast quote actually goes, and which lines you can and can't push on. The figures below are an illustrative quote built from the ranges I see in Houston-area proposals, not a bid from any one company.

The $13,900 quote, line by line

Line item	Typical cost	What you should see
Outdoor condenser, coil and air handler (matched set)	$5,900	Brand, full model numbers, SEER2 and EER2 of the matched combination
Refrigerant line set replacement	$650	Length, and whether the old set is being flushed or replaced
Pad, disconnect, whip	$350	Composite pad, not the old cracked slab reused
Condensate drain, float switch, secondary pan	$400	A float switch on both the primary and secondary drain
Plenum and duct transition work	$700	Sealed with mastic, not tape
Thermostat	$250	Compatible model, not a bundled upsell
Permit and inspection	$300	City permit number on the paperwork
Refrigerant recovery and haul-away	$250	EPA-certified recovery of the old charge
Labor (two techs, one long day, sometimes two)	$2,200	Usually rolled in, but worth asking
Overhead, warranty reserve, margin	$2,900	Never itemized; this is where quotes differ most
Total	$13,900

The $10,400 bid in Pearland dropped roughly $1,600 from the equipment tier, about $900 from the duct work and drain hardware, and the rest from a thinner margin. The homeowner picked the cheaper one and found out in July why the duct line mattered.

The equipment line is smaller than you think, and the model number matters more than the brand

At $5,900 the equipment is less than half the quote. Trane, Carrier, Lennox, Rheem and Goodman all sell a version of the same architecture, and the real price differences between a builder-grade single-stage 14.3 SEER2 unit and a two-stage 17 SEER2 unit run about $1,500 to $2,500 installed, not the $5,000 gap a brochure implies. For most of Texas the federal regional standard for a residential split air conditioner is 14.3 SEER2 for systems under 45,000 Btu, so anything you buy already clears the floor.

The thing to check is that the outdoor unit, the indoor coil and the air handler are an AHRI-matched combination. A quote that lists a 16 SEER2 condenser but reuses your existing coil is quoting you a rating the mixed pair never earned. Ask for the AHRI certificate number of the combination. It takes the salesperson two minutes to look up, and if he can't, that tells you what you need to know.

Since January 2025, new residential equipment ships with R-454B instead of R-410A. That refrigerant is mildly flammable, which is why installers need current training on it. You don't need to do anything about that as a buyer, except to be suspicious of a company that offers to install a leftover R-410A system at a big discount. The federal Section 25C credit that used to trim a few hundred dollars off a heat pump or AC job ended for equipment placed in service after December 31, 2025, so no quote this year should be counting it as a discount.

Sizing: the line that isn't on the quote

The single most important number in this job is not on the paper. It's the cooling load, calculated using ACCA Manual J, and it's the reason a 3.5-ton unit might be right or might be a full ton too big. A lot of Houston houses built in the 1990s have been reinsulated, re-windowed or had radiant barrier decking added since, and the load dropped while the tonnage assumption stayed put. An oversized unit cools the air so fast it shuts off before pulling much moisture out, and in Houston humidity that means a house that reads 74 degrees and feels like a wet towel.

Ask for the Manual J printout. Many contractors will run it in software in twenty minutes; the cheap ones will say "we go by square footage" and mean it. Rule-of-thumb sizing (500 square feet per ton) is how a 2,100-square-foot house ends up with a 4-ton system when 3 tons was enough. That mistake costs about $700 more in equipment and shortens compressor life through short cycling for as long as you own the house.

The license, the permit and the drain line: $1,000 of protection

Texas licenses air conditioning contractors through the Texas Department of Licensing and Regulation under Occupations Code Chapter 1302, and the license number, which begins with TACLA or TACLB, is supposed to appear on contracts and advertising. Look it up on the TDLR license search before anyone starts work. It takes a minute and it tells you if the license is active and whether there are disciplinary actions on file. Our Texas HVAC license requirements page walks through what each license class covers.

The permit is a separate check. Houston and most other large Texas cities require a mechanical permit for a full changeout, which puts an inspector on your job. The $300 line above covers the fee and the time to pull it. A contractor who says "we don't pull permits for replacements" is telling you either that he's cutting a corner or that he doesn't hold a license in your city. Either way, it can come back on you when you sell the house and the buyer's inspector asks for the paperwork.

Then there is the drain line, the small item that causes most of the water damage I hear about in Gulf Coast homes. In August a Houston air handler can push several gallons of condensate an hour through a 3/4-inch PVC line. When that line clogs, and algae guarantees it eventually will, water backs up into the pan and then into your ceiling. A float switch on the primary line and another on the secondary pan shuts the system down before that happens. It's a $25 part on a $13,900 job. If it isn't listed, add it.

Ducts: the number nobody wants to quote

Attic duct leakage in the Houston area routinely runs 20% to 30% of system airflow on older homes. Putting a new 17 SEER2 condenser on leaky ducts is like buying a new engine for a car with a slow tire leak. A good replacement quote includes at least a duct leakage test or a visual inspection, mastic sealing at the plenum and boots, and a static pressure reading after the install. That work runs $700 to $1,500 and it's what turns the rated efficiency into real bills. If your quote says nothing about ducts, ask what pressure the system will run at and what it was measured at before. A vague answer means nobody measured.

How to use this against a quote

Put the three quotes side by side and mark which ones name a matched combination, include a load calculation, list the permit and the license number, and specify float switches and mastic. A quote that hits all of those at $13,900 beats a quote that hits half of them at $10,400 nearly every time, because the missing half is paid for later in comfort, repairs or a warranty claim the manufacturer denies over improper installation. If you want to see what Houston-area contractors quote against that checklist, our Houston HVAC page is the place to start.

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