What are the most common HVAC scams?

Five HVAC scams account for the bulk of state HVAC board complaints. Each is a specific misdiagnosis or false pricing pattern.

1. "Your compressor is dying." The single most common HVAC misdiagnosis. The technician runs a quick pressure check on a no-cool call and announces compressor failure, pitching a $5,000-$10,000 condenser replacement or a $8,000-$15,000 full-system replacement. In reality, 60%+ of no-cool calls are diagnosed cheaply: dirty filter ($20), dirty condenser coil ($150 cleaning), low refrigerant due to a leak ($300-$1,500 leak repair + recharge), failed capacitor ($15-$50 part + labor), failed contactor ($30-$80 part + labor). Defense: demand a multi-step diagnosis with measurable values: superheat, subcool, return-supply temperature split, condenser fan amp draw, compressor amp draw. A real compressor failure shows specific symptoms — open windings, locked rotor, or hard-start failure with shorted contactor — and the technician can show you the measurements.

2. Refrigerant top-off without a leak search. A sealed refrigerant loop should not lose refrigerant. If the system is low, there is a leak. A technician who "tops off" the charge and leaves is selling you refrigerant you will keep losing. Refrigerant has gotten expensive as R-22 was phased out and R-410A is now phasing out — a top-off can run $200-$800 and recurs annually or seasonally. Defense: either insist on a leak search (electronic detector, UV dye, nitrogen pressure test) or replace the leaking line set. EPA rules require leak detection on commercial systems over 50 lbs and best-practice it on residential.

3. Oversized-system replacement without Manual J. The contractor quotes "a 4-ton replacement to match your existing 4-ton" without running a load calculation. The existing system might have been oversized 30 years ago when standards were looser; replacing like-for-like perpetuates the oversize, causing short-cycling, poor dehumidification, and reduced life. A real replacement quote includes Manual J (heat load by room), Manual S (equipment selection from Manual J), and ideally Manual D (duct design). Defense: ask to see the Manual J output. If the contractor doesn't run Manual J, get a second quote from one who does.

4. Refrigerant "shortage" surcharges. The technician claims the refrigerant type is unavailable or in shortage and adds a $300-$800 "shortage surcharge." R-22 phase-out is real (banned for new production since 2020, so virgin R-22 is genuinely expensive), but the surcharge is often padded. Defense: ask the brand and quantity, then look up street pricing. R-410A in 2026 is in active phase-down to R-454B / R-32, so phase-out pricing is real but verifiable.

5. Upfront-deposit phoenix. The HVAC contractor quotes a full system replacement at $12,000, takes $4,000 upfront, and disappears before equipment arrives. Defense: cap deposits at the legal limit (California 10% or $1,000), pay by credit card for chargeback protection.

6. (Bonus) "You need new ductwork too." Sometimes true (high duct leakage, R-value too low, asbestos), often upsell. A real ductwork recommendation comes from a Duct Blaster test (measured CFM25 leakage per 100 sq ft) and visible damage in attic/crawl photos. "I just looked at it and it's bad" is not evidence.

7. (Bonus) EPA 608 fraud. A technician without EPA 608 certification cannot legally handle refrigerant. Some "techs" handle refrigerant illegally; the homeowner only finds out when the EPA fines and refrigerant venting violations surface. Verify EPA 608 status separately from the state HVAC license.

Groundcheck (earthmove.io/trust) verifies state HVAC license, EPA 608 status where listed, prior disciplinary actions, and phoenix-company patterns. It does not verify Manual J accuracy or refrigerant leak honesty — get a second quote on any job over $5,000.