You found the house. Three bedrooms in Richardson, built in 2004, updated kitchen, big backyard. The offer is accepted. Your inspector spends four hours on the roof, the foundation, the electrical panel, and the plumbing.
The HVAC system gets one line in the report: “System operational at time of inspection.”
That single line covers the most expensive mechanical system in the house. A full AC and furnace replacement in DFW runs $8,000 to $15,000 installed. Price depends on home size and equipment. A general home inspector checks whether the system turns on. That is the whole test.
Why Your Home Inspector Is Checking the Wrong Thing
A standard home inspection in Texas follows the TREC (Texas Real Estate Commission) Standards of Practice. The inspector verifies that the system operates. Cold air comes out of the vents in cooling mode. Warm air comes out in heating mode. The thermostat responds to input.
What the inspector does not measure: refrigerant charge, airflow volume, ductwork condition, or efficiency. A 16-year-old system in a Plano subdivision can pass a TREC inspection on a mild March afternoon. That same system can fail completely during a 105-degree week in July.
The system being operational today says very little about what it will cost you over the next five years.
Five Questions to Ask Before You Sign
- How old is the system?
Walk outside to the condenser unit. Find the metal nameplate on the side. The manufacture date is printed there, sometimes as a date, sometimes coded into the serial number. In North Texas, AC systems last 12 to 15 years with regular maintenance. The national average is 15 to 20 years. Our cooling season runs roughly seven months, from April through October. That extra runtime shortens every system’s life.
A system manufactured in 2010 is already past the midpoint of its expected life in DFW.
- What refrigerant does it use?
Systems manufactured before 2010 likely use R-22 refrigerant. Production of R-22 ended in the United States in 2020. The remaining supply is reclaimed or stockpiled. A single recharge now costs $600 to $1,200. A system running R-410A uses current-production refrigerant at a fraction of that cost.
If the house you are buying has an R-22 system, you are buying equipment with an expiration date. Every leak becomes a financial decision.
- Is there a maintenance history?
Ask the seller for any service records. Tune-up invoices, repair receipts, filter purchase history. A system serviced twice a year will outlast one that has been ignored. Two years without maintenance in a DFW summer means dirty coils, a weakening capacitor, and a clogged drain line.
Sellers in Arlington, Grand Prairie, and Irving sometimes have records through their HVAC company. Others have nothing. Both answers tell you something.
- When was the ductwork last inspected?
Older DFW homes carry original ductwork. Homes built between 1970 and 1995 in Garland, Mesquite, and East Dallas are the most common. Flex duct in Texas attics degrades. Connections loosen. Insulation compresses. A duct system leaking 20 to 30 percent of its airflow cools the attic as much as your living room.
Duct sealing and repair runs $500 to $1,500. A full duct replacement in a single-story ranch runs $3,000 to $5,000. Those are numbers worth knowing before you close.
- What is the SEER rating?
SEER stands for Seasonal Energy Efficiency Ratio. It measures how much cooling the system produces per unit of electricity. Older systems in DFW often run at 10 to 13 SEER. Current federal minimum for Texas is 15 SEER. High-efficiency units run 18 to 22 SEER.
On a July electric bill, the gap between a 10-SEER and 16-SEER unit is real. In a 2,200-square-foot home in Flower Mound, that difference runs $80 to $120 per month. Over a seven-month cooling season, you are looking at $560 to $840 per year.
The Smart Move: Get a Dedicated HVAC Inspection
A general home inspector is good at what they do. HVAC diagnostics require a licensed HVAC technician with gauges, airflow measurement tools, and system-specific training.
Before you close on a home in DFW, schedule a standalone HVAC evaluation. The cost is typically $150 to $300. The technician checks refrigerant pressure and measures supply and return airflow. They inspect the ductwork from inside the attic. They test the capacitor and contactor. You get an honest read on how much life the equipment has left.
That $200 evaluation can save you from a $12,000 surprise eighteen months after closing.
Use What You Find at the Negotiating Table
In Frisco and McKinney, where new construction neighborhoods sit next to 15-year-old subdivisions, buyers often discover aging systems during inspection. That finding belongs in your negotiation.
Say the system is 13 years old, running R-22, with no maintenance history. You have a legitimate basis to negotiate. Ask for a price adjustment or a seller-funded replacement before closing. Your agent can use the HVAC technician’s written report as documentation.
A seller who knows the system is old expects this conversation. Bringing data makes it a reasonable discussion instead of a gut-feel argument.
Your First 30 Days as a Homeowner
Once you have the keys, three things protect your HVAC investment.
Change the air filter. The previous owner’s filter has their dust, their pet dander, and their timeline. Start fresh with a quality pleated filter rated MERV 8 to 11. Write the date on the filter frame with a marker.
Schedule a tune-up. Even if the system passed inspection, a full tune-up within the first month sets your baseline. The technician documents refrigerant levels, electrical readings, and component condition. That record becomes your reference point for every future service call.
Learn where your shutoffs are. Find the breaker for the outdoor unit. Find the indoor disconnect. Find the condensate drain cleanout, usually a PVC cap near the indoor unit. In a Southlake two-story or a Keller ranch, these locations vary. Knowing where they are before you need them saves time and panic.
Get a Straight Answer Before You Close
If you are buying a home anywhere in Dallas-Fort Worth, Houk runs pre-purchase HVAC evaluations across the metroplex. The technician gives you a written report with system age, condition, efficiency estimate, and remaining useful life. No sales pitch. The report is yours to use however you need.
Book online or call us directly. We run same-day and next-day appointments across DFW.
| THE READING | |
| SYSTEM AGE | Any home with HVAC equipment manufactured before 2012. Especially relevant for homes built 1995-2010 across DFW suburbs. |
| KEY NUMBER | $8,000-$15,000. The installed cost of a full AC and furnace replacement in Dallas-Fort Worth. Your home inspector’s one-line verdict does not account for this. |
| THE CALL | Walk outside. Find the condenser nameplate. Read the manufacture date. Then schedule a standalone HVAC evaluation before your option period expires. |
| MEASURED TRUTH | The HVAC system is the most expensive thing in your new house that nobody walks you through before closing. |
