HVAC Service Notes & Diagnostics

By Jonnier Exposito – HVAC Technician

When people think about air conditioning, they usually think about temperature—not air quality. But what if I told you that installing UV lights in your HVAC system could protect your health, extend the life of your unit, and improve your home’s air quality?

As a licensed HVAC technician, I’ve seen how powerful UV systems can be when installed properly. In this blog series, I’ll break down what UV lights are, how they work, and why I recommend them to so many of my clients.

🔬 What Are UV Lights in an HVAC System?

Ultraviolet (UV) lights are installed inside your air handler or ductwork. These lights emit short-wavelength UV-C radiation, which destroys the DNA of mold, bacteria, and viruses.

They don’t just “trap” germs like a filter would. They kill them.

🦠 Why UV Lights Are Important – 4 Core Benefits

1. Kills Mold and Bacteria at the Source

Your AC coil is wet and dark—perfect for mold growth. Once mold grows on the coil, it reduces efficiency and spreads spores into your home.

UV lights:

Destroy mold spores on the evaporator coil Keep the coil clean and dry Prevent bacteria buildup that causes bad smells

2. Improves Indoor Air Quality

Poor air quality can trigger asthma, allergies, and headaches. UV lights reduce:

Airborne pathogens Mold spores Viruses and bacteria

That means cleaner air every time your system runs.

3. Protects Your HVAC System

Mold and sludge buildup on coils and drain pans can damage your AC over time. By keeping those parts clean, UV lights help:

Extend the life of your blower motor and coil Keep your system running efficiently Lower your electric bill

4. Silent and Maintenance-Free

Once installed, UV lights run quietly in the background. Most bulbs last 1 to 2 years and only need a simple replacement.

📅 What’s Coming in Part 2?

In the next blog post, I’ll cover:

The two main types of UV lights (coil vs. air sterilization) Where to install them What to expect during a professional installation Whether they’re safe for kids and pets

👍 Final Thoughts (Part 1)

If you’re serious about protecting your health and keeping your HVAC system clean, UV lights are one of the best upgrades you can make. They’re not just for hospitals or luxury homes—every home can benefit.

Until next time,

– Jonnier Exposito