In Houston the air conditioner is not an appliance. It is the system that decides whether the house is livable from May to October, and it runs harder here than almost anywhere else in the country. That changes how you should read an HVAC bid. The cheapest system that meets code will cool the house; whether it dehumidifies it, keeps the second floor within five degrees of the first, and lasts twelve years instead of eight is where the money in the bid actually goes.
Here is what a replacement runs in 2026, what the add-ons cost, and how to compare two bids that describe different systems.
HVAC Installation Cost Breakdown
What these ranges price: replacing a residential central air conditioner, or a full split system (AC plus furnace or heat pump), in an existing home. Ductwork is extra unless the row says otherwise.
| Level | Price Range (per system, installed) |
|---|---|
| Air conditioner only, standard efficiency | $6,500 – $8,600 |
| Full system, AC plus furnace, 2,000 sq ft home | $11,600 – $14,100 |
| Full system with new ductwork, or variable-speed equipment | $15,500 – $23,000 |
These are national ranges, last reviewed September 2026, from three sources that line up: Trane's 2026 installed pricing guide (a standard-efficiency AC replacement at $6,568 to $8,544, a variable-speed one at $11,525 to $13,669), Modernize's August 2026 guide (an average full replacement at $11,590 to $14,100, about $13,430 for AC plus gas furnace on a 2,000 to 2,500 sq ft home, and $15,500 to $23,000 once ductwork is included on larger homes), and a May 2026 CBS News report citing This Old House at $7,000 to $20,000 for a basic system on a 2,000 sq ft house. They are not a study of the Houston market. 365 Builders works statewide; treat these as a starting point, not a quote.
Where the extra money goes, from the same sources:
- Ductwork: $2,100 to $4,000 to add or replace ducts (Modernize), and about $3,000 on a typical job per CBS. On a Houston house with ducts in a 140-degree attic, this is the line most worth spending on. A new 16-SEER unit pushing air through leaky, uninsulated ducts is a 12-SEER system in practice.
- Furnace or air handler: an 80 percent furnace runs $5,093 to $6,386 installed and a 96 percent one $6,630 to $8,390 (Trane). In Houston the furnace runs a few weeks a year, so the high-efficiency version rarely pays back; spend the difference on the cooling side.
- Heat pump instead of AC plus furnace: $7,369 to $15,608 installed (Trane). A heat pump does both jobs and suits a Gulf Coast winter well. It is worth a real comparison if the gas furnace is due too.
- Variable-speed equipment: the top of each Trane tier. It costs more and it is the single upgrade that changes how a Houston house feels, because it runs long and slow and pulls humidity out instead of short-cycling.
What Drives the Price Up or Down
1. Tonnage, and whether it is right
Houston houses are routinely oversized, because "bigger is safer" is the easy answer. It is the wrong one here. An oversized unit hits the thermostat fast and shuts off before it has dehumidified anything, which is why some houses sit at 74 degrees and feel clammy. Ask for a Manual J load calculation, not a rule of thumb per square foot. If a contractor will not do one, they are guessing with your money.
2. Efficiency rating
Higher SEER2 ratings cost more up front and pay back faster in Houston than anywhere north of here, because the system runs eight months a year. Ask for the payback in years against your actual electric bill, not a percentage.
3. The ducts
See above. If the ducts are original to a 1990s house, plan on replacing or at least sealing and insulating them. It is not an upsell; it is the difference between the system you paid for and the one you get.
4. Electrical
A larger or higher-efficiency condenser sometimes needs a new disconnect, a new breaker, or a new circuit. Usually a few hundred dollars. A panel that is already full is a different conversation and a different trade.
5. Access and location
An air handler in a tight attic, a condenser on a pad that has sunk, a line set that has to be rerouted through a finished wall: all normal, all labor. A good bid names them.
6. Timing
Nobody in Houston wants to replace a system in July, and every contractor is booked when it dies in July. If you know the system is on its last season, a spring replacement is cheaper and calmer than an emergency one.
How to Compare HVAC Bids
- Same tonnage, same SEER2, same stages. A single-stage 15 SEER2 unit and a variable-speed 20 SEER2 unit are not the same product at different prices. Match them before you compare.
- Ductwork in or out? The most common reason two bids differ by $4,000.
- What is the labor warranty? Manufacturer parts warranties are ten years on most brands if registered. The contractor's labor warranty is one to two years on most bids, longer on good ones. Ask.
- Who pulls the permit? A replacement needs a mechanical permit in most Texas cities. If a bid does not include it, ask why.
- Is the old refrigerant recovered and the old unit hauled off? Should be included. Should be written down.
- Ask for the load calculation and the equipment model numbers on the bid. A bid that says "3-ton 16 SEER system" without model numbers can be filled with anything.
Frequently Asked Questions
How long does an HVAC replacement take?
A like-for-like changeout with the ducts left alone is usually a one-day job once the equipment is on site. Adding ductwork, moving the air handler, or a full system with a new furnace runs longer. The equipment lead time and the permit are what stretch a schedule, and we put both in writing with the estimate.
Repair or replace?
A compressor failure on a system past twelve years is usually the moment to replace, especially if it uses an older refrigerant that is now expensive. A capacitor, a contactor, a fan motor, or a board on a younger system is a repair. Ask for the unit's age and refrigerant type before you decide.
Does Houston require a permit for a new AC system?
A system replacement is permitted mechanical work in most Texas cities, Houston included, and a good contractor pulls it as part of the job. If a bid is quiet about permits, that is a question to ask before you sign, not after.
Is a heat pump a good idea on the Gulf Coast?
Yes, for most houses. Houston winters are mild enough that a heat pump heats efficiently almost every day of the year, and it replaces both the AC and the furnace with one piece of equipment. Where a gas furnace still makes sense is a house that already has gas and a furnace with years left in it.
Get a Free HVAC Estimate in Houston, TX
At 365 Builders, we provide detailed, transparent estimates for HVAC projects throughout Houston, TX and across Texas. We've been serving the community since 2015, and we stand behind our work. Send us the nameplate photo off the old condenser and the square footage of the house, and we will tell you the likely tonnage, whether the ducts are worth touching, and which band you are in before we build a number.
Explore our HVAC services, see what we do in Houston, or browse all the areas we serve across Texas.
Call us at (956) 607-0470 or request a free quote to get started.