Florida Humidity Can Grow Mold Inside Your AC | BioShieldUV Cutaway of a home air handler with a UV-C lamp shining across the wet evaporator coil.

For Florida Homeowners

Florida Humidity Can Grow
Mold Inside Your AC.
MagShield Stops It At The Coil.

Your AC’s evaporator coil is wet by design, and in Florida, it rarely dries out. MagShield puts lab-tested UV-C on that coil, installs in about 15-30 minutes, and comes with a 90-day Clean Coil Promise.

Protect My Coil See How It Works
“I wish I'd ordered this UV-C months ago.”
Verified Amazon buyer

When You Keep The Coil Clean, The Wet Months Get Easier

MagShield ApxShield BioShieldUV MagShield magnetic UV-C lamp clamped to a bracket, its tube glowing blue in a sunlit room.

BioShieldUV MagShield (Magnetic)

Choose your power option

  • Free US shipping · 2-day express available at checkout
  • 90-Day Clean Coil Promise
  • Trusted by 10,000+ families nationwide
BioShieldUV ApxShield classic twin-lamp UV-C unit on its mounting plate, both tubes glowing blue.

BioShieldUV ApxShield (Classic)

Choose your power option

  • Free US shipping · 2-day express available at checkout
  • 90-Day Clean Coil Promise
  • Trusted by 10,000+ families nationwide
Proof

Independently Lab-Tested. Backed By a 90-Day Promise.

  • >99%

    Mold growth prevented

    (Aspergillus niger)

  • >99.999%

    Bacteria eliminated

    (Staphylococcus aureus)

Side-by-side photographs of the same evaporator coil: on day 0 it is matted with grey biological fouling, on day 90 under the UV lamp the fins are clean and the copper is bright. Day 0 Day 90

Test Conditions

Intertek Columbus Microbiology Laboratory, ASTM E3135. One-hour exposure with biological soil on TruBlu bulbs, under lab conditions. Results in your system depend on placement, bulb age and runtime.

View The Full Lab Report

Hear From Our Customers In Florida

  • 2 kits and still costs less than what the A/C company quoted. WIN WIN!!

    Verified Amazon purchase · 18W Wall

  • Independent test results… verify the quality result for your AC system. Looking forward to clean coils again.

    Verified Amazon purchase · 18W Wall

  • MagShield is easy to assemble and to install in my HVAC unit with the no-drill magnet feature.

    Verified Amazon purchase · 18W Wall

See The Installation In Action

The 90-Day Clean Coil Promise

See A Cleaner Coil In 90 Days,
Or Get Every Dollar Back

Photograph your coil on day one. Run BioShieldUV for 90 days. If the coil isn't visibly cleaner, we refund your full purchase price and return shipping, and you keep the unit.

Read The Full Terms An air-conditioner evaporator coil, grey and clogged on its left half and bright and clean on its right half, with a lit BioShieldUV lamp standing between the two. Day 0 Day 90

How UV-C Works

BioShield UV, Aimed Where The Moisture Sits

Cutaway view inside a stainless air handler: the finned evaporator coil stands on the left and a BioShield UV-C lamp is bracketed to the duct wall on the right, its blue light washing across the coil face.

  • Works alongside your filter.  The EPA recommends UV be used with filtration, not instead of it.

  • Shines 253.7 nm UV-C on the coil, around the clock.  The EPA describes UV lamps used this way as targeting mold and bacteria growing on HVAC surfaces like cooling coils.

  • Mounts by magnet inside your system, facing the evaporator coil. MagShield attaches by magnet with no drilling. ApxShield mounts permanently through the duct wall.

See How To Install

Pick Your Setup. Install In Minutes.

ApxShield MagShield

~30 minutes, permanent install

~15 minutes, no tools, no wiring

  1. A hand flipping the HVAC breaker off inside an open electrical panel. 01

    Cut power at the breaker

    Switch off the system and the circuit feeding it.

  2. An installer holding the BioShieldUV Classic unit flat against the sheet-metal duct wall. 02

    Mount the UV-C in the duct

    Drill the mounting hole near the coil and secure the unit.

  3. The mounted UV-C unit wired to a transformer, with a hand holding the power block. 03

    Wire it in

    Connect to your HVAC's (24V/120V) power.

    Not comfortable with wiring? Any HVAC tech can do this.

  4. The installed Classic lamp glowing blue inside the air handler, facing the coil. 04

    Restore power, check the light

    The indicator confirms it's running. Never look directly at the lit lamp.

  1. A hand flipping the HVAC breaker off inside an open electrical panel. 01

    Turn off the system and open the cabinet

    Find a spot with a clear view of the coil.

  2. A gloved hand wiping the inside wall of the air handler before placing the magnetic lamp. 02

    Wipe the surface, place the magnet

    The magnetic base holds the unit in place.

  3. An installer holding the MagShield lamp by its magnetic base inside the duct. 03

    Plug in, or wire to 24V

    Wall-plug version uses a 120V outlet. Ballast version connects to your HVAC.

  4. The MagShield lamp glowing blue on its magnetic mount inside the air handler. 04

    Close the panel, check the light

    The indicator confirms it's running. Never look directly at the lit lamp.

Watch Installation Video

BioShieldUV Air Guardian BioShieldUV presenter holding the Classic 36W twin-lamp unit.

ApxShield Installation Video

BioShieldUV® Classic 36W Device | Installation Demo

2:16 · Full device install

BioShieldUV Air Guardian BioShieldUV presenter pointing at the Magnetic 18W lamp.

MagShield Installation Video

BioShieldUV® Magnetic 18W Device | Installation Demo

4:43 · Full device install

Safety

Low Ozone Emission, By Design

The EPA warns that some UV air devices produce ozone, a lung irritant. Ozone comes from 185 nm light, so every BioShieldUV lamp is tuned to 253.7 nm, the germicidal wavelength, and filters out 185 nm with ozone-free quartz.

Both MagShield and ApxShield are ETL listed to UL 60335-2-40. UV-C can harm eyes and skin, so the lamp only runs sealed inside your air handler or ductwork, never in open living space.

Intertek certification mark ETL listed mark

BioShieldUV Output Vs Safety Limits

Lower Higher

  1. 0.000ppm
  2. 0.025ppm
  3. 0.050ppm
  4. 0.075ppm
  5. 0.100ppm
BioShieldUV™ output 0.014 ppm Completely Safe

0.000 ppm 0.100 ppm

Vs FDA and CARB limit 0.050 ppm

0.000 ppm 0.100 ppm

EPA NAAQS limit 0.070 ppm

0.000 ppm 0.100 ppm

OSHA permissible limit 0.100 ppm

0.000 ppm 0.100 ppm

Florida This Season

What Your Home Is Up Against This Year

  • Palm trees bending in wind and heavy rain along a Florida causeway.

    Weather Outlook

    This Dry Season May Not Be Dry

    NOAA gives El Niño better than 90% odds this winter. El Niño generally brings Florida above-average rain through spring. More moisture in the air means more condensation on the one part of your home built to stay wet: your AC coil.

    Source: NOAA CPC (Sept 2026) · National Weather Service

    Keep Your Coil Clean All Winter
  • A bright Florida living room with tall house plants and a linen sofa on a mild day.

    Mild Fall Days

    Cool, But Clammy? Here’s Why.

    Your AC needs about three minutes each cycle to reach full moisture removal. Mild fall days mean shorter runs, so humidity can linger. The EPA notes mold and bacteria can grow where condensation sits on cooling coils and drain pans.

    Source: UCF Florida Solar Energy Center · U.S. EPA

    See What UV-C Does On a Damp Coil
  • A residential air handler with flexible duct work, installed in a closet.

    Back For The Season

    Locked All Summer? So Was Your AC.

    In a UCF study of Florida homes left without AC, indoor humidity averaged 62–73% from June to October. Researchers noted mold and mildew grow when humidity stays above about 70% for long stretches. Start the season by getting your coil clean.

    Source: UCF Florida Solar Energy Center, FSEC-CR-1487-04

    Start The Season With a Clean Coil
  • Grey-green mold spreading across the corner of a white interior wall.

    Who Feels It First

    Some People Feel Indoor Mold First.

    DOH lists babies, children, older adults, people with asthma or allergies, and those with weakened immune systems as the people indoor mold may affect sooner and more severely. That's why stopping mold where your air passes with an UV-C light matters.

    Source: Florida Department of Health

    Keep Your Coil Clean All Winter
  • A woman pinching her nose at the stale air coming from a wall-mounted air conditioner.

    That Musty Smell

    Musty Smell When The AC Kicks On?

    An earthy or musty odor may point to a mold problem. Hence, DOH recommends routinely inspecting your evaporator coil, drain pan and drain lines. BioShieldUV keeps UV-C on your coil around the clock.

    Source: Florida Department of Health

    Keep Your Coil Clean All Winter

Frequently Asked Questions

There's no outlet in my AC closet. Now what?

Choose the 24V ballast version, which draws power from your HVAC system (wiring required). If you'd rather add an outlet, use a licensed electrician.

Is it safe with kids and pets in the house?

The lamp only ever runs sealed inside your air handler or ductwork, never in open living space, and the last step of every install is confirming no opening remains through which UV-C light can escape. Ozone output is independently tested at 0.014 ppm — below the 0.050 ppm FDA and CARB limit.

What if it arrives damaged or won't turn on?

Send us photos and we ship the replacement or the missing part expedited at no cost. This is not a return — you keep what you have, there is no return label and no fee, and if it was damaged in transit we file the carrier claim ourselves. If a brand-new bulb will not light, check the pin seating first: a loose connection is the most common cause.

My system flooded in a storm. Will this fix it?

No. BioShieldUV treats biological growth on the coil surface and is rated for dry locations only — it does not replace filtration, ventilation or professional remediation. After standing water, have the system inspected and dried out first. Once it is dry, UV-C helps keep the coil clean from that point on.

How often do bulbs need replacing?

Every 10 months, which is roughly 8,000 hours of continuous running. Past that the lamp still glows blue but its UV-C output has faded, so replace on schedule regardless of what it looks like. Guardian Club members get a fresh bulb shipped automatically.

Certifications and specifications

  • 253.7 nm UV-C
  • Intertek tested
  • ASTM E3135ETL listed
  • 0.014 ppm ozone