Why Lennox Healthy Climate Uses UVC, Not Standard UV Light

If you've shopped around for a UV air purifier for your Manchester, NH home, you've probably noticed the listings don't say much. A lot of products just say "UV light" and leave it there. That gap matters more than most homeowners realize, because not every UV light works the same way, and the wrong kind can quietly make your indoor air worse instead of better, especially for anyone in the house with asthma.

At GSMS, we install two Lennox Healthy Climate products. Our In-Duct Air Purifier runs on UVC light specifically, never a generic UV bulb. Our other option, PureAir, tackles the same ozone risk through a different route entirely; more on that below. Here's the difference, and why it's worth understanding before you buy anything for your ductwork.

UV light comes in three types, and only one belongs in a bare UV bulb in your ductwork

UV light covers a range of wavelengths, grouped into UVA, UVB, and UVC. UVC sits at the shortest wavelength of the three, which is what makes it effective at disrupting mold, bacteria, and other microorganisms without the tradeoffs that come with the other two. The catch is that plenty of air purifiers marketed with "UV" in the name never specify which type they use. That detail is exactly what determines whether the unit is safe to run continuously in a home, or whether it's putting something into your air that you didn't ask for.

Why ozone is a problem, especially if you have asthma

A regular UV light, one that isn't specifically UVC, can produce ozone as a byproduct. Ozone doesn't sound great to begin with, but the real issue is for people with asthma, who can react seriously to it. According to the EPA, even relatively low amounts of ozone can cause chest pain, coughing, shortness of breath, and throat irritation, and can worsen asthma and other chronic respiratory conditions.

There's a second catch that catches people off guard. Mayo Clinic points out that ozone can mask odors by changing the chemical makeup of particles in the air, so a room seems fresher, while the device isn't actually filtering out the small particles that trigger asthma. Someone installs a UV light thinking they're helping their family's air, and depending on what they bought, they've traded a real problem for one they can't smell.

How the Lennox Healthy Climate In-Duct Air Purifier is built differently

Because it's UVC only, the In-Duct Air Purifier from Lennox Healthy Climate doesn't carry that ozone risk. It also does more than a bare bulb: the unit pairs its UVC lamp with two carbon filter blocks. The reaction between the UVC light and the carbon creates a catalyst effect that helps break down odors from pets, cooking, and everyday living. So instead of just disinfecting the air moving past it, you're getting odor control built in, without the byproduct you didn't sign up for.

Where it goes, and how long installation takes

The In-Duct Air Purifier always goes on the supply side of your duct system, positioned high enough above the A-coil (the evaporator coil) or the furnace heat exchanger to treat the air before it's distributed through the house. For most New Hampshire homes with a standard forced-air setup, a GSMS Specialist can complete the install in about two hours. Some homeowners pair it with an air filter upgrade at the same visit, but it works just as well as its own standalone service.

Maintenance: why the light staying on doesn't mean it's still working

Some manufacturers will tell you a UVC bulb lasts two years. In practice, the bulb's actual disinfecting output drops off well before that. The light keeps glowing, so it looks like it's working, but it's no longer strong enough to do the job it was installed for. That's why GSMS recommends annual maintenance for the In-Duct Purifier: our visit replaces both the UVC lamp and the carbon cell, so the unit keeps performing the way it did on day one instead of quietly coasting on a light that looks fine but isn't doing much.

What about PureAir? A different technology, same ozone-safety goal

If you already have a decent pleated filter in place, the In-Duct Purifier is the more budget-friendly path: it adds UVC and carbon filtration on top of what you've already got. If you want the highest level of filtration available in one unit, Lennox PureAir is the other option we install, but it's worth knowing it isn't a bigger version of the same UVC technology. PureAir combines a MERV-16 filter that physically traps particles with a UVA lamp and a titanium dioxide-coated cartridge that drives a process called photocatalytic oxidation, breaking pollutants and odors down rather than just capturing them.

That's also how PureAir handles ozone: rather than avoiding it by using UVC, PureAir actively destroys ozone that's already present in your home's air, on top of producing none of its own. Different mechanism, same result: cleaner air without the asthma-aggravating tradeoff. Either product is built for homes with traditional ductwork. Neither is compatible with mini-split or boiler systems, worth knowing upfront if you're comparing options for a home that doesn't run on forced air.

Breathing easier in your New Hampshire home

New Hampshire winters mean closed windows and closed-up homes for months at a time, which lets everyday indoor pollutants, pet dander, cooking residue, and dust build up with nowhere to go. Whether it's UVC-based odor control or PureAir's more complete filtration, an upgrade like this is one of the more straightforward improvements for households dealing with allergies, asthma, or just a home that never quite smells fresh.

GSMS installs and services Lennox Healthy Climate air purifiers throughout Manchester, Nashua, Merrimack, Bedford, Londonderry, and the rest of our southern New Hampshire service area. If you're weighing your options, browse our Indoor Air Quality Services page, or contact a GSMS Specialist to talk through what makes sense for your ductwork and your household.

Already thinking about humidity too? Read our breakdown of steam vs. bypass humidifiers or start with the basics in Improving Indoor Air Quality: Essential Tips for Your NH Home. Members of the GSMS Home Club can fold annual maintenance for either product into a scheduled visit, so it's one less thing to track on your own.