HVAC Scams to Watch Out For

The HVAC industry has more scams than any other home service trade. Part of it is that nobody knows what's actually inside their AC. Part of it is that breakdowns happen during emergencies, when people are too hot to think straight. And part of it is that there are a lot of crooks in the business.

Here are the ones we see most often in Houston, and how to spot them before you've handed over your credit card.

Scam #1: The Mystery Freon Leak

How it works: A tech shows up for a service call. Quotes you 5 pounds of "Freon" at $150/lb. Doesn't actually find a leak. Just charges you for refrigerant.

Two months later, the same thing. Then again. You're paying $750 every couple months and the unit "just keeps leaking."

WARNING: Real leaks need to be found and fixed. If a tech adds refrigerant without doing a leak search (electronic detector, dye, or bubble test), they're either incompetent or scamming you. Refrigerant doesn't just disappear — if it's low, there's a hole somewhere, and that hole needs to be located.

How to avoid it: Insist on a documented leak search before any refrigerant is added. Get the result in writing. If they "can't find" the leak but want to add refrigerant anyway, get a second opinion.

Scam #2: The Unnecessary Compressor Replacement

How it works: Tech tells you the compressor is bad. Quotes you $3,000-$5,000 for a replacement, or recommends a whole new system for $9,000+.

Reality: The capacitor is dead. That's a $20 part and 10 minutes of labor.

The capacitor is what gives the compressor and fan motor the kick they need to start. When it fails, the compressor hums but won't start. Looks and sounds exactly like a dead compressor to someone who doesn't know better.

How to avoid it: Always ask the tech to test the capacitor first. It's a 30-second test with a multimeter. If they refuse or say "the whole compressor needs to be replaced anyway," you're being scammed.

Scam #3: "Your Coil is Black"

How it works: Tech opens up your air handler, snaps a photo of the indoor coil, and shows you a horrifying-looking black/gray coating. Tells you it's mold or biological growth, you need a $1,200 UV light system or a $2,000 coil replacement.

Reality: That dark coating is normal. It's a mix of dust and the natural patina of aluminum and copper. Every coil that's been running for more than a year looks like that. It's not mold and it's not affecting performance.

TIP: A real mold problem in your air handler smells musty and you'll feel it — sneezing, watery eyes, headaches when the AC runs. If you're not experiencing those symptoms, no UV light system is going to change your life.

Scam #4: The 14 Quote, 12,000 Bill

How it works: You get a quote for a 14 SEER system at $5,500. Sounds great, way under everyone else. You sign. Once they've torn out the old system, suddenly the bill is $12,000 because:

• Your line set "needs to be replaced"
• Your ductwork "is undersized"
• Your electrical "isn't up to code"
• The platform "needs to be rebuilt"

How to avoid it: Get an itemized, written quote that includes line set, electrical, ductwork modifications, permit, and disposal of the old unit. Make them write "no additional charges without prior written approval" on the quote. If they won't, walk.

Common Scam Comparison

Scam #5: The Cracked Heat Exchanger

How it works: Tech says your heat exchanger is cracked, carbon monoxide is leaking into your home, you need a new furnace tomorrow. Plays on fear.

Reality: Real cracked heat exchangers do happen, but they're rare on units under 15 years old. The scam version uses a flashlight angle to make a normal weld line or rust stain look like a crack.

How to avoid it: Demand to see the crack with an inspection mirror, a borescope camera, or your own phone. If the tech won't or can't show you, get an immediate second opinion from a different company. Real cracks are visible. The "scam crack" disappears under proper inspection.

Scam #6: Door-to-Door Duct Cleaning

How it works: Someone shows up uninvited offering "free duct inspection." Then they show you a photo of disgusting ducts (often not yours). Quote you $500-$3,000 to clean them. Sometimes they damage the ductwork during the "cleaning" so they can sell you new ducts.

Reality: Most homes don't need duct cleaning. The EPA's official position is that there's no evidence routine duct cleaning prevents health problems or improves air quality. We have a whole separate post on this one.

WARNING: Never let an uninvited contractor inside your house. Period. Real HVAC companies don't go door-to-door.

How to Find an Honest HVAC Company

The criteria are simple:

1. Licensed in Texas. Check at TDLR.texas.gov. The license number should be on every truck, business card, and quote.
2. Properly insured. Ask for a Certificate of Insurance. Liability and workers' comp.
3. Will give you a written quote with line items. Anything verbal or "we'll figure it out as we go" is a no.
4. Will give you a second opinion in writing if asked. Real companies welcome this.
5. Local reviews from real people. Look at Google reviews older than 3 years — anyone can buy fresh reviews. Established history is harder to fake.
6. Doesn't pressure you. "This price is only good today" is a high-pressure sales tactic. Real companies don't operate that way.

What to Do If You've Been Scammed

If you suspect you got ripped off:

1. Get a second opinion in writing. This is your evidence.
2. Dispute the charge with your credit card company. They side with the customer more often than people think.
3. File a complaint with TDLR (Texas Department of Licensing and Regulation). They take this seriously and contractors can lose their license.
4. Leave an honest review. Specific, factual, no name-calling. It helps the next person.

FAQ

How do I know if I'm getting scammed during an emergency call?

Slow down. Even in 100° heat, take 30 minutes to call one other company for a second opinion. Most will give you a phone consultation for free. If the second tech says something different, you've found your scam.

Are big-name national HVAC companies more trustworthy than local ones?

Not necessarily. The biggest HVAC scams in Houston in the last 10 years came from large companies with massive ad budgets. Their salesmen work on commission and have monthly quotas. Smaller local shops with steady reputations are usually more honest because they live or die by referrals.

What's a fair markup on parts?

Most reputable companies mark up parts 2x-3x retail. So a $20 wholesale capacitor becomes $50-$60 installed. Anything beyond 4x is gouging. You can usually find part prices online to check.

Should I trust the techs the warranty company sends?

Be cautious. Warranty company techs are paid less per call, so they sometimes pad the bill with non-covered "recommended" repairs to make money. Get a second opinion on anything they recommend that isn't covered under warranty.

Can I report HVAC scams in Texas?

Yes. File at tdlr.texas.gov/complaints. Also file with the Texas Attorney General's Consumer Protection Division. If the contractor isn't licensed, TDLR will go after them aggressively.