
Radiant Heating
RADIANT & IN-FLOOR HEATING SERVICE IN NORTH LOUISIANA
Warm floors, even heat, no drafts. We service, repair, and install in-floor radiant heating across North Louisiana — manifolds, zones, and leak checks, flat-rate before we start.
4.9 · 3,569 reviews (2 profiles)
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3,569 reviews · 2 profiles
24/7 Emergency
Call for current availability
Licensed & insured
LA Master Plumber #1874
North Louisiana
Ruston to Monroe
Flat-rate pricing
Quoted before we start
Overview
Why Radiant Heat Feels Better
Radiant heating warms your home from the floor up instead of blowing hot air through vents. Heated water (or, in some systems, electric mats) runs through tubing under the floor, so the warmth is even, quiet, and draft-free — no cold spots, no dust getting kicked around, no whoosh of a furnace fan. For bathrooms, additions, sunrooms, and whole-home comfort, it's one of the nicest ways to heat a space.
In North Louisiana our winters are mild, which actually plays to radiant heat's strengths: it delivers steady, gentle warmth without the blast-and-cool cycle of forced air, and it pairs beautifully with the tile and concrete floors that stay cool in our long, humid summers. Mark Johnson & Sons designs, services, and repairs radiant systems across Ruston, Monroe, West Monroe, and Grambling. Every quote is flat-rate and given before we touch a tool, and the service call is waived when you have us do the repair.
What we service
- Hydronic (hot-water) radiant — PEX floor loops fed by a boiler or water heater, the most common in-floor system
- Electric radiant mats — under-tile heating in bathrooms and additions
- Manifolds and zones — zone valves, actuators, balancing valves, and the manifold assembly itself
- Circulation and pressure — circulator pumps, expansion tanks, air separators, and leak tracing
Repair vs. new install
Most radiant service calls are a single cold zone, a stuck valve, trapped air, or a slow pressure drop — affordable, targeted repairs, not whole-system failures. A properly installed loop can outlast the house; it's the manifold, valves, circulator, and heat source that need attention over the years. When you're adding radiant to a remodel or new slab, we design the zones and manifold around your floor construction and heat source and give you a real number before we start.
What Mark Johnson & Sons does differently
Because we're a combined plumbing and heating company, hydronic radiant work is right in our wheelhouse — it's manifolds, zone valves, circulators, and PEX as much as it is heat, and most HVAC-only shops don't touch it. We trace leaks without tearing up the whole floor, bleed and balance every zone so the warmth is even, and confirm pressure holds before we leave. Every tech is on our payroll, no subcontractors.
Ask about our service savings agreement plans — the seasonal heating tune-up folds in a check of your loop pressure, circulator, and zones, plus you get 15% off any repair.
Free quote
Flat-rate radiant heating quote
Tell us whether it's hydronic or electric, how many zones, and what's wrong — or that you're planning a new install. We'll give you a real number before any work starts.
4.9★
24/7
Emergency
Free
Quote
Current coupons
View all$89 OFF
Waived diagnostic with any radiant repair
Service call credited back when you approve the repair.
Expires 12/31/2026
15% OFF
Repairs with service savings agreement
Memberships start at $189/year. Discount applies to HVAC & plumbing repairs.
Expires 12/31/2026
$300 OFF
New in-floor radiant installation
Qualifying multi-zone install. Must mention at booking.
Expires 12/31/2026
Mention coupon when booking. One offer per household.
Warning signs
Signs Your Radiant Heating Needs Service
Radiant systems are reliable, but when something's off you'll feel it in the floor. Watch for these before a cold snap.
One zone or room stays cold while others heat fine
Floors take much longer than usual to warm up
System pressure dropping or needing frequent top-ups (possible leak)
Circulator pump humming but floors staying cold
Uneven warmth — warm and cold stripes across the same floor
Manifold or zone valve leaking or not opening
Boiler or water heater feeding the loop short-cycling
Damp spot or unexplained moisture on a slab or subfloor
Air gurgling in the loop or a zone that won't bleed clear

Even, quiet comfort
Warmth from the floor up — no drafts, no dust, no fan noise.
Radiant heat spreads gentle, even warmth across the whole room and pairs perfectly with the tile and concrete floors common in North Louisiana homes. We keep it running right.
Answered live
24/7
Across Ruston, Monroe, West Monroe, and North Louisiana.
The Process
How a Radiant Heating Service Call Goes

On the truck
Professional tools, parts, and diagnostics — every call.
On-phone triage
We ask about your system — hydronic or electric, how many zones, its age, and what's wrong. If pressure is dropping fast on a hydronic loop, we treat it as a leak and prioritize.
Full diagnostic on-site
The tech checks the manifold, zone valves, circulator, system pressure, and thermostat, and traces any leak or airlock. You get a clear diagnosis before a quote.
Flat-rate quote
You see the price before any work starts — repair, or, for new installs, a designed layout with zones, manifold, and heat source spelled out at real numbers.
Repair or install the system
We fix leaks, replace failed valves or circulators, bleed and balance zones, or lay out and install new in-floor tubing and manifolds for even, draft-free heat.
Balance, test, and clean up
We balance the zones, verify each one warms evenly, confirm pressure holds, and leave the work area clean.
Pricing
How We Price Radiant Heating Work
Flat-rate, quoted before we start. Service members get 15% off repairs. After-hours emergency service is billed separately.
Flat rate, quoted before we start
You get the full price for the job up front — not an hourly meter you watch climb. You approve it before a tool comes out of the truck.
The quote is the price
It doesn't move once work begins. If something unexpected turns up behind a wall or under a slab, we stop and talk it through with you before going further.
Service members save 15% on every repair
Service savings agreements start at $189 a year and take 15% off all plumbing, heating, and cooling repairs, with priority scheduling on every call. The Premium Service Savings Agreement Plan adds same-day service and drops after-hours charges entirely.
Financing available
Bigger jobs — a system replacement, a repipe, a sewer line — can be financed through GoodLeap. Apply online in a few minutes.
Every job is priced for your home and what it actually needs — tell us what's going on and we'll get you a firm number, free and with no obligation.
Service Savings Agreement Plans
Two plans. Whole-home peace of mind.
From $189 a year, service members get 15% off every plumbing, heating, and cooling 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
Service Savings Agreement Plan
$189/year
Everything it takes to keep the house maintained and your repairs discounted.
Each additional HVAC unit is $89/year
Premium Service Savings Agreement Plan
$389/year
Everything in the Service Savings Agreement Plan, plus no after-hours charges, no travel fees, and same-day service.
Each additional HVAC unit is $89/year
Questions? (318) 319-0220
1-year term · does not auto-renew
FAQ
Radiant Heating FAQs
Does radiant floor heating make sense in North Louisiana?
It can be a great fit. Our winters are mild, and radiant heat delivers steady, gentle warmth without the blast-and-cool cycle of forced air — it's especially nice under the tile and concrete floors common in North Louisiana homes, which otherwise stay cool underfoot. It's popular for bathrooms, additions, sunrooms, and whole-home comfort.
Why is one room in my radiant system cold?
Usually it's a zone problem: a stuck zone valve, air trapped in that loop, a thermostat fault, or an unbalanced manifold. A single cold zone rarely means the whole system is failing. We isolate the zone, bleed and balance it, and replace the valve or actuator if that's the cause.
How do I know if my radiant system has a leak?
The clearest sign on a hydronic system is pressure that keeps dropping and needs frequent topping up, sometimes with an unexplained damp spot on a slab or subfloor. We trace leaks without tearing up the whole floor and repair them at the source. Don't ignore a slow pressure drop — it only gets worse.
How much does radiant heating cost to install in North Louisiana?
New in-floor radiant is quoted per zone, driven by the area, the floor construction (new slab, over subfloor, or under tile), and how many zones you want. The boiler or water heater that feeds the loop is quoted separately. We design the layout and give you a flat-rate number after a site visit.
What heats the water for a radiant floor?
A boiler or a dedicated water heater feeds the loop, with a circulator pump moving the warm water through the tubing and a manifold splitting it into zones. Because we handle both the heat source and the loop in-house, we can size and match them correctly instead of leaving you to coordinate two trades.
What maintenance does radiant heating need?
Hydronic radiant systems benefit from an annual check of pressure, the circulator, zone valves, and the heat source, plus bleeding any trapped air. It's low-maintenance overall, but a yearly look keeps the zones balanced and catches leaks early. We fold this into a seasonal heating tune-up.
Can you install radiant heat in an existing home?
Often yes, though it depends on the floor construction. In a remodel or addition we can lay tubing in a new slab, over a subfloor, or under certain floor coverings, and tie it into a boiler or water heater. On a site visit we'll tell you honestly what's practical for your home and quote it flat-rate before any work.
Is electric radiant different from hydronic?
Yes. Electric radiant uses heating mats under tile and is common for a single bathroom or small area — simple, but more expensive to run over a large space. Hydronic (hot-water) radiant uses PEX loops fed by a boiler or water heater and is the better choice for whole rooms or a whole home. We service and install both and can tell you which fits your project.
How fast can you respond to a radiant heating problem?
We answer live 24/7 and dispatch quickly for a fast-dropping pressure or an active leak, usually on-site in 60 to 90 minutes for emergencies. Routine cold-zone and balancing calls are typically same-day or next-day. An after-hours surcharge applies on top of the repair.
Is radiant heating covered by the service savings agreement?
The $189/year Service Savings Agreement Plan includes two HVAC tune-ups and an annual plumbing check-up, plus 15% off repairs and priority scheduling. For radiant-heated homes we tailor the heating tune-up to your system, and the 15% repair discount applies to radiant work — no auto-renew, cancel anytime.
Do you offer financing on a new radiant system?
Yes. Financing is available on radiant installs so a whole-home or multi-zone project doesn't have to be paid all at once. We'll go over the plans and monthly numbers with your flat-rate design quote so you can decide with the full picture in front of you.
Related services
Related Heating Services
These often come up alongside radiant heating work.

Boiler Service
Boiler repair, maintenance, and replacement — the heat source many radiant loops rely on.

Thermostat Installation
Smart and programmable thermostat setup — precise, per-zone control for radiant comfort.

Furnace & Heating Maintenance
Complete seasonal tune-up — safety checks, cleaning, and inspection to head off winter breakdowns.
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