Indoor Air Quality
INDOOR AIR QUALITY SERVICES IN NORTH LOUISIANA
Filtration, UV purification, whole-home dehumidification, and fresh-air ventilation for cleaner, healthier air through our humid Louisiana summers. Licensed install, flat-rate quote before we start.
4.9 · 4,400+ reviews
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4.9★ on Google
4,400+ reviews
24/7 Emergency
60–90 min dispatch
Licensed & insured
LA Master Plumber #1874
North Louisiana
Ruston to Shreveport
Flat-rate pricing
Quoted before we start
Overview
Cleaner, Healthier Air All Year
In North Louisiana, the air inside your home is often working against you. Long, humid summers pull moisture into the house, and that moisture feeds mold, dust mites, and mildew — while spring pollen, pet dander, and everyday dust ride the same air your family breathes. A standard one-inch furnace filter barely scratches the surface; it's there to protect the equipment, not your lungs. Mark Johnson & Sons builds indoor air quality into your existing HVAC system so the whole home breathes easier.
There's no single "air quality" gadget that fixes everything — particles, humidity, and germs are three different problems that need three different tools. We match the fix to what you're actually dealing with and integrate it into the system you already own.
What we install
- High-efficiency media filtration — a 4–5 inch cabinet filter that captures pollen, dust, and dander a 1-inch filter misses, without choking airflow
- UV germicidal lights — mounted at the coil to stop mold, mildew, and bacteria from growing on the wet evaporator and spreading through the ducts
- Whole-home dehumidifiers — pull sticky Louisiana humidity down to a healthy 45–50%, drying out the mustiness a struggling AC can't
- Fresh-air ventilators (ERV/HRV) — swap stale indoor air for filtered fresh air without throwing away your cooling, important in tightly sealed newer homes
Which one do you need?
Filtration is the baseline for anyone with allergies, dust, or pets. Add a UV light if you're fighting a musty coil, mold smell, or biofilm. A whole-home dehumidifier is the big lever in our climate — it's what actually kills the damp, heavy feeling and the mildew in closets. Most homes that call us with a real problem end up with a combination, and we'll tell you honestly what will move the needle and what's a waste of money for your situation.
What Mark Johnson & Sons does differently
No subcontractors — the licensed tech on-site is on our payroll and accountable to the job. We size the equipment to your home and ductwork so a high-MERV filter doesn't strain the blower, seal every connection, and set the controls to run automatically with your AC and heat. Ask about our Classic Membership — tune-up visits are the ideal time for us to swap media filters and UV bulbs so your air stays clean without you tracking dates.
Free quote
Ask about cleaner air
Tell us what you're noticing — musty smells, dust that never quits, allergy flare-ups, or damp windows — and we'll recommend the right fix and quote it flat-rate before any work.
4.9★
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Quote
Current coupons
View all$150 OFF
Whole-home dehumidifier installation
New equipment only. Must mention at booking. One offer per household.
Expires 12/31/2026
$75 OFF
UV germicidal light with any air quality install
Installed with filtration or dehumidification. One offer per household.
Expires 12/31/2026
15% OFF
Air quality installs for Classic Membership members
Requires active Classic Membership. Cannot combine with other offers.
Expires 12/31/2026
Mention coupon when booking. One offer per household.
Warning signs
Signs Your Home Needs Better Air Quality
Humid Louisiana summers make indoor air problems worse. If any of these sound familiar, your air is telling you something.
Musty or mildew smell that lingers even when the AC runs
Dust settles back on surfaces within a day of cleaning
Allergy or asthma symptoms that flare up worse indoors
Windows or vents fog up, or the house feels sticky and damp
Visible mold or mildew near vents, in closets, or on bathroom ceilings
Stale, stuffy air in a tightly sealed newer home
Humidity readings above 55% indoors during summer
Someone in the house is sick more often, or sleeps poorly with congestion
The 1-inch filter is gray and clogged within a month
Humidity control
Sticky, musty air? A whole-home dehumidifier changes everything.
Louisiana summers push indoor humidity past healthy levels, feeding mold, dust mites, and that damp, heavy feeling. Whole-home dehumidification keeps your air dry, clean, and comfortable all season.
Ideal indoor humidity
45-50%
Across Ruston, Monroe, Shreveport, Bossier City, and North Louisiana.
The Process
How an Indoor Air Quality Visit Works
On the truck
Professional tools, parts, and diagnostics — every call.
Air quality assessment
We check indoor humidity, inspect the ductwork and coil for mold or dust, and talk through what your family is noticing — allergies, odors, or dampness.
Right-sized recommendation
Based on your home size, HVAC system, and the problem, we recommend filtration, UV, dehumidification, ventilation, or a combination — no upsell on gear you don't need.
Flat-rate quote
You see the total price before we start, including equipment, install, and any duct modifications. No hourly meter, no surprises.
Professional install
We integrate the equipment into your existing system, seal connections, and set controls so it runs automatically with your AC and heat.
Test and walk-through
We verify airflow, humidity control, and operation, then show you how it works and when to change media filters or bulbs.
Pricing
Indoor Air Quality Costs in North Louisiana
Flat-rate, quoted before we start. Classic Membership members get 15% off. Final price depends on your system, home size, and ductwork.
Indoor air quality assessment / service call
Waived when you move forward with the install
Standard
$89–$129
Member · save 15%
$76–$110
High-efficiency media filter cabinet
4–5 inch whole-home filtration, captures far more than a 1-inch filter
Standard
$350–$650
Member · save 15%
$298–$553
UV germicidal light install
Stops mold and bacteria growth on the evaporator coil
Standard
$350–$700
Member · save 15%
$298–$595
Replacement media filters / UV bulbs
Media 6–12 months, UV bulb yearly — free labor at a membership visit
Standard
$60–$180
Member · save 15%
$51–$153
Whole-home air purifier (electronic / PCO)
Active purification of particles, odors, and pathogens
Standard
$700–$1,400
Member · save 15%
$595–$1,190
Whole-home dehumidifier
Ideal for humid Louisiana summers — controls mold and mustiness
Standard
$1,800–$3,200
Member · save 15%
$1,530–$2,720
Fresh-air ventilator (ERV / HRV)
Swaps stale indoor air for filtered fresh air without wasting cooling
Standard
$1,500–$3,000
Member · save 15%
$1,275–$2,550
After-hours emergency service
Added to the work for nights, weekends, holidays
Standard
$175–$500
Member · save 15%
$149–$425
Member pricing reflects the Classic Membership 15% repair discount. Service call fees are separate.
Ranges reflect 2026 North Louisiana residential work. Duct modifications and multi-system homes quoted separately.
Classic Membership
One plan. Whole-home peace of mind.
For $189 a year, members get 15% off every HVAC and plumbing repair, two complete HVAC tune-ups, a free plumbing and drain check-up, and priority scheduling on every call.
- 15% off repairs
- Priority scheduling
- 2 HVAC tune-ups/yr
- After-hours discounts
- $25 savings certificate
- Guaranteed flat-rate
Classic Membership
$189/year
One flat yearly price covers your whole home — everything listed, no per-visit fees, no surprises.
Questions? (318) 319-0220
Cancel anytime · 1-yr min
Compare
UV Light vs. Media Air Cleaner vs. Whole-Home Dehumidifier
Three tools for three different problems — germs, particles, and humidity. Many North Louisiana homes end up combining them, so this is about which one solves what you're actually noticing.
| Feature | UV Germicidal Light | Media Air Cleaner | Whole-Home Dehumidifier |
|---|---|---|---|
| What it targets | Mold, mildew, bacteria on the coil | Pollen, dust, dander, particles | Humidity, that damp/musty feel |
| Best for | Musty coil smell, biofilm | Allergies, asthma, heavy dust | Sticky air, mold in closets |
| Upfront cost | $350 – $700 | $350 – $650 | $1,800 – $3,200 |
| Upkeep | Bulb yearly (~$90) | Media every 6–12 months | Little — clean the coil/filter |
| Does it dry the air? | No | No | Yes — the main humidity fix |
| Does it filter particles? | No | Yes — the main particle fix | Some, as air passes through |
FAQ
Indoor Air Quality FAQs
Our long, humid summers push indoor moisture and allergens sky-high. High humidity feeds mold, dust mites, and mildew, while pollen and dust circulate through your ducts. Filtration, dehumidification, and UV purification tackle the exact problems our Louisiana climate creates — cleaner air and a healthier home.
Related services
Related Cooling Services
Indoor air quality works best paired with a clean, well-maintained system.
AC Maintenance
Coil cleaning and a full tune-up keep the system that moves your air clean and efficient.
Ductless Mini-Split
Zoned comfort with built-in filtration — great for additions and rooms that never stay comfortable.
AC Installation
A new, right-sized system removes more humidity and pairs perfectly with whole-home air upgrades.
Available Around the Clock
Emergency?
We answer 24/7.
Burst pipe, water heater out, sewer backup? Real plumbers pick up — no answering machines. Mark Johnson & Sons Plumbing serves North Louisiana any time, day or night.
LA Master Plumbing #1874 · Backflow Cert #28131 · Master Natural Gas Fitter #LMNGF9062 · State Contractors #35794