Hiring a HVAC technician is one of the higher-stakes decisions a homeowner makes. Bad work is expensive to fix; unlicensed work can void your insurance and complicate your home's resale. This guide walks the verification process the way HomeClip itself runs it, license check, red flags, written quote comparison, and Trust Score sanity-check.
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Step 1: Verify their state credentials
In Texas, HVAC technicians are required by law to hold an active license from Texas Department of Licensing and Regulation. Anyone performing work for hire without one is operating illegally. You can look up a license directly: TDLR license search ↗.
Red flags, walk away if you see these
⚠ Selling you a new system on the first diagnostic visit
By far the most common HVAC scam: the tech 'discovers' your 8-year-old system needs full replacement during a $79 service call. Reputable techs diagnose and repair, replacement should be a discussed decision, not pitched same-day. If your system is under 15 years and the repair is $1,500, repair almost always wins on math.
⚠ Refusing to provide a Manual J load calculation for new install
A right-sized HVAC system requires a Manual J load calc (heat-load study). 'We sized it based on your old system' is laziness or a sales tactic, the old system was often wrong, especially after windows or insulation upgrades. Oversized systems short-cycle and waste energy; undersized ones never cool the house on a 100° day.
⚠ No written estimate breaking out equipment, labor, refrigerant, and warranty
HVAC replacement bids should itemize: equipment (model #s), refrigerant type + charge, labor, permits, and warranty terms (manufacturer + labor). A flat number like '$14,000 for a new system' hides where you're being overcharged.
⚠ Charging for refrigerant by the can/bottle without disclosure
R-410A and R-454B refrigerants have wholesale costs around $5-12/lb but are commonly charged at $50-120/lb. Markup is normal; not telling you how much is being added (especially on a service call) is shady.
⚠ Pushing a high-efficiency system for a small house
A 20-SEER variable-speed system in a 1,200 sq ft home will never pay back its premium in cooling savings. Right-sizing efficiency to home size and climate matters. A tech pushing the most expensive system 'because it's better' is selling a margin, not solving your problem.
⚠ No permit pulled on system replacement
Texas requires a permit for HVAC system replacement in nearly all jurisdictions. Skipping the permit means no inspection, which means no one verified your refrigerant line set, no one checked the breaker sizing, and no one confirmed the install isn't a code violation.
The 6-step verification process
Run every HVAC technician you're considering through these steps before signing anything or paying any deposit.
- 1. Verify TDLR Air Conditioning Contractor license. Search at tdlr.texas.gov/LicenseSearch/. The license must be Active. There are different classes (Class A for any size; Class B residential under 25 tons), confirm the class matches your job.
- 2. Get a Manual J load calc for any new install. Insist on a written load calculation. Refusing to do one is a yellow flag; doing one and showing the math is a green flag. The output sets the right tonnage and efficiency for your house, not a generic rule-of-thumb.
- 3. Get 3 itemized written quotes with equipment model numbers. Quotes should specify exact equipment (e.g. Trane XR16 4-ton, 16 SEER2), refrigerant line set work, electrical work, drain line, condensate pump if needed, permit fee, and labor warranty. The HomeClip Get 3 Quotes flow pulls 3 verified HVAC quotes within the hour.
- 4. Check insurance + worker's comp. HVAC techs work with high-voltage and pressurized refrigerant, worker's comp is non-optional. Get a COI.
- 5. Confirm permit + inspection. Reputable HVAC installs pull a permit and end with a municipal inspection. If they 'don't need' a permit on a system swap, ask which jurisdiction they're claiming exempts the work. (Travis County and Austin do not.)
- 6. Get the warranty terms in writing, both labor and equipment. Manufacturer warranties are typically 10 years on parts (some on compressors). Labor warranty from the installer should be 1-2 years on the install work. Get both in writing, manufacturer warranties often require the install to be by a registered contractor.
What a fair quote looks like
Pricing varies by region, complexity, and material choice, but these Texas benchmark ranges are a sanity check. Quotes well outside these ranges in either direction warrant a second look.
| Job type | Fair range (Texas) |
|---|---|
| Service call (diagnostic) | $80–$200 |
| Capacitor replacement | $200–$500 |
| Refrigerant top-off (with leak check) | $300–$700 |
| AC replacement (4-ton, 16 SEER2) | $8,000–$14,000 |
| Furnace + AC replacement (full system) | $12,000–$22,000 |
How HomeClip helps
Every HVAC technician on HomeClip has a 0–100 Trust Score combining TDLR license verification + reliability + quality + Google and Reddit sentiment, responsiveness, and pricing fairness. Paying us never changes a Trust Score, the ranking you see is the actual ranking.
Want quotes without doing the vetting work yourself? Get 3 free quotes from verified HVAC technicians , we send your job to the 3 highest-scored HVAC technicians in your city; they reach out to you within the hour. Your leads go only to you, never shared.
Frequently asked questions
How do I verify an HVAC contractor's license in Texas?
Search at tdlr.texas.gov/LicenseSearch/. Confirm the Air Conditioning Contractor license is Active and the class is appropriate for your job (Class A for any tonnage; Class B for residential under 25 tons).
What is a fair price for a 4-ton AC replacement in Austin?
$8,000-$14,000 for a standard 16 SEER2 single-stage 4-ton condenser + matching air handler + permit + install in Austin. Variable-speed 18+ SEER systems run $13,000-$22,000. Outside that range, both above and below, warrant extra scrutiny.
How often should I replace my AC system?
Typical residential AC system: 12-18 years in Texas. If your system is under 12 years and the repair quote is under $2,000, repair almost always wins on math. Beyond 15 years, replacement starts making sense even on smaller repairs because failure rate climbs and refrigerant types are phasing out.
Why is my HVAC tech pushing a new system instead of a repair?
Two reasons: legitimate (refrigerant has phased out, compressor is dead, repair would be 60%+ of replacement cost) or commission-driven (sales-incentivized techs upsell). Get a second opinion before any replacement quote over $8,000, the HomeClip Get 3 Quotes flow gives you 3 independent looks within the hour.