A homeowner who agreed to a $3,200 UV-C "decontamination" add-on after an AC breakdown soon found it was an ineffective, but expensive, upsell.
As commenters on Reddit noted, UV lights may have some use, but they do not replace actually cleaning out mold or biological growth.
Here's what to know
The homeowner said the service call started with a bad capacitor diagnosis and then shifted to a warning about biological material in the system.
"He said something about needing replacement every few months but I read the bulbs can last a year," the homeowner wrote. "I also read that uv is kind of pointless without removing the actual mold."
Much of the discussion centered on the price. One commenter said the equipment costs "about 400 bucks" and takes only a few minutes to install in the plenum.
Another commenter, who said they had owned and operated an HVAC company, wrote that "the UV systems most hvac companies sell to residential customers cost about 400-600 dollars and the bulbs last about a year."
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Commenters also drew a distinction between prevention and cleanup, saying UV may help limit future growth on parts such as an evaporator coil, but it does not remove mold that is already there.
More background
Commenters repeatedly pointed to cleaning as the real first step.
A commenter in Southern California said their company would usually charge "$800-$1200" to clean a similar unit, with access affecting the price. Another commenter said their company charges $1,500 for a Reme Halo with a sanitizer and cleaning.
The maintenance plan also added up. At $61 per month, the homeowner would be paying $732 per year before even considering whether the bulb replacement schedule was actually necessary. If a bulb really lasts about a year, as multiple commenters suggested, the recurring cost becomes harder to justify.
Some commenters also focused on moisture as part of the problem. If standing water, low blower speed, or ductwork issues are causing mold to form, a UV light may only treat the symptom while the conditions that created the problem remain.
What can be done?
Before approving add-ons, it's important to ask whether the quote includes coil cleaning, blower cleaning, duct cleaning, or remediation of moisture issues.
A second opinion can help prevent paying for equipment that does not solve the actual problem. Based on the thread, a more targeted, cleaning-focused approach might cost hundreds or low thousands, rather than pairing a large upfront fee with an ongoing monthly contract.
The thread also raised questions about bulb life, ozone production, maintenance frequency, and whether the system is meant to prevent future buildup or address existing contamination. Commenters were clear that prevention and cleanup are not the same thing.
Separating the UV device price from labor and cleaning can make it easier to tell whether the charge is for a needed fix or a high-margin add-on.
Where can I learn more?
It certainly isn't the first time someone has been charged more for HVAC services than necessary.
• In Houston, a homeowner got a $16,000 quote for what looked like basic AC repair.
• Another homeowner was shocked by a $25,000 quote for a basic AC replacement.
• In Florida, HVAC pros gave a hard pass to a viral AC saver.
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