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Call Us
A real person answers 24/7. Tell us what's wrong — we'll give you a ballpark quote on the phone and schedule a time that works.
Simsboro homeowners get same-day, flat-rate plumbing from our nearby Ruston crews — emergency calls, drain cleaning, water heaters, and slab leak repair.
Heating & Cooling in Simsboro
Weak airflow, warm air, short-cycling, or a system that won't start — diagnosed and fixed same-day.
Learn moreHigh-efficiency AC and heat-pump systems sized with a real load calc — Trane, Carrier, Rheem.
Learn moreNo-heat calls, flame sensors, igniters, blower motors, and control boards — gas and electric.
Learn moreThe right fit for North Louisiana's mild winters — repair, replacement, and dual-fuel installs.
Learn moreNo cooling in a Louisiana summer is an emergency — 24/7 dispatch with a real person on the line.
Learn moreHumidity control, filtration, and duct solutions for the mold and allergen load of a humid climate.
Learn moreWhat to Expect
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A real person answers 24/7. Tell us what's wrong — we'll give you a ballpark quote on the phone and schedule a time that works.
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Our plumber arrives in a Mark Johnson & Sons Plumbing van, in uniform, shoe covers on. Diagnoses the issue and quotes flat-rate before any work starts.
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We complete the work, clean up, and walk you through everything we did. Warranty covers our work for the life of the parts.
Mark Johnson & Sons Plumbing
Real people answer 24/7. Same-day service available.
Heating & Cooling in Simsboro
Mark Johnson & Sons has run heating and cooling in Simsboro since 1997, out of the same dispatch as our plumbing side — so one call covers the whole house. Every tech who shows up is our own employee: Louisiana-licensed, background-checked, drug-tested, and trained on the equipment that actually sits in Simsboro homes. We don't sub the work out, we don't hand you to a call center, and we quote flat-rate before we start — no diagnostic surprises, no high-pressure replacement pitch when a repair will do.
Simsboro's older homes commonly run aging duct systems that work overtime through hot, humid summers; heat pumps are common replacements, and occasional hard freezes still bring winter service calls. With a core of 1960s–1990s builds across Simsboro, we see the full range of equipment ages and duct conditions in a single service area — and the climate is unforgiving to all of it. Compressors that would coast for twenty years in a mild climate get worked hard here; refrigerant charge, capacitor health, and coil cleanliness all matter more when the system barely gets a night off from June through September.
Simsboro is a small, stable agricultural village (about 800 residents, ~340 housing units) with a suburban-rural feel — mostly established single-family homes from the mid-to-late 20th century, with owner-occupancy the norm. That's why diagnosis beats guesswork. A Simsboro home that isn't cooling in Simsboro might have a failed run capacitor, a contactor that's pitted shut, a slow refrigerant leak at a flare fitting, a frozen evaporator coil from low airflow, or simply a filter nobody's changed in a year. We measure — superheat and subcooling, static pressure, temperature split, amp draw — and tell you which one it is, instead of adding refrigerant to a leak and sending you a bill.
AC repair is the highest-volume call we run in Simsboro, and most of it breaks into a handful of failures: a bad run or start capacitor (the single most common no-cool cause), a burned contactor, a seized or noisy condenser fan motor, a clogged condensate drain tripping the safety switch, or low refrigerant from a leak. On R-410A systems we find and fix the leak before we recharge — topping off a leaking system is throwing money at the ground. On older R-22 units, where refrigerant is phased out and expensive, we'll tell you honestly when another repair stops making sense.
Every truck carries the common failure parts — capacitors, contactors, fan motors, hard-start kits, thermostats — so most Simsboro repairs are same-visit, not a "we'll order the part and come back Thursday" when your house is 85 degrees inside.
When a system is past its service life — generally 12 to 15 years in this climate, sooner for R-22 units — replacement usually pays for itself in efficiency and reliability. The single biggest mistake we correct on Simsboro replacements is sizing: an oversized AC short-cycles, never runs long enough to pull humidity out of the air, and leaves the house cold and clammy. We run an actual Manual-J load calculation on the home — square footage, insulation, window load, duct condition — and size the equipment to it, rather than "matching what was there" or rounding up a ton to be safe.
We install high-efficiency AC, heat-pump, and dual-fuel systems from Trane, Carrier, and Rheem, set the refrigerant charge by weight and verify it by subcooling, and commission every install so it actually hits its rated performance. Financing is available, and we'll walk the real payback math with you before you sign anything.
Simsboro's winters are mild with the occasional hard freeze, which makes heat pumps a strong fit — they cool in summer and heat efficiently down to the temperatures this region actually sees, and pair with electric or gas backup for the cold snaps. We service and install heat pumps, gas furnaces, and dual-fuel systems, and our no-heat calls come down to the usual suspects: a dirty flame sensor, a cracked or failed hot-surface igniter, a blower motor or capacitor, a tripped limit switch, or a bad control board. Every no-heat visit includes a safety check — heat exchanger inspection and, on gas equipment, a look for combustion and carbon-monoxide issues.
A perfectly good system can't cool a Simsboro home if the ducts are leaking half the air into the attic. Leaky, undersized, or crushed ductwork is behind a huge share of "my AC can't keep up" and "one room is always hot" complaints. We test static pressure and airflow, seal and repair duct runs, add or resize returns where a system is starved for air, and balance the registers so the back bedrooms get the same air as the ones nearest the handler. Fixing airflow often recovers more comfort than a bigger unit would have.
Humidity is the other half of comfort in North Louisiana — a house that's cool but damp feels worse than one a few degrees warmer and dry, and the moisture drives mold, dust mites, and that musty summer smell. A correctly-sized system that runs longer cycles pulls humidity out on its own; where that isn't enough, we add whole-home dehumidification, better media or HEPA filtration, and UV or duct solutions for the mold and allergen load a humid climate creates. If someone in the Simsboro home has allergies or asthma, indoor air quality is worth taking seriously, not treating as an upsell.
Because the equipment works year-round here, the twice-a-year tune-up that comes with our Classic Membership — a spring AC visit and a fall heating visit — is the single cheapest way to keep a Simsboro system from dying on the hottest or coldest day of the year. Maintenance holds efficiency (a dirty coil or low charge quietly runs up your power bill), catches a weak capacitor or a marginal contactor before it strands you, and protects the manufacturer's warranty, which almost always requires documented annual service. Members also get priority scheduling and a discount on repairs.
HVAC change-outs and new installs in Simsboro require mechanical permits and inspections, and refrigerant handling is federally regulated — both are licensed work, not a handyman job. Mark Johnson & Sons carries the state mechanical licensing, EPA-certified techs, and the general liability and workers' comp coverage any Simsboro homeowner should ask about before letting a crew into the house. Village of Simsboro permitting within village limits; rural Lincoln Parish parcels on private well and septic. We pull the permits, schedule the inspections, and hand you the signed-off paperwork for your records and any future home sale — you don't chase the Lincoln Parish building department, we do.
No cooling in a Louisiana July is not an inconvenience — for infants, older adults, and anyone with a health condition, it's a genuine emergency, and a no-heat night during a hard freeze is the same. Simsboro's small agricultural village — established families, many longtime homeowners deserve an HVAC company that actually answers at 2am. Small agricultural village in western Lincoln Parish Our emergency line is live around the clock, answered by a real dispatcher — not a voicemail — and our typical urgent response time across Simsboro and the rest of the 71275 service area is under two hours. If your system is down in dangerous heat or cold, stop reading and call (318) 319-0220.
Same-day service · Flat-rate pricing · Family-owned since 1997.
By the Numbers
30
Years in Business
300+
5-Star Reviews
4.9★
Google Rating
24/7
Emergency Response
“Our AC quit during a July heat wave and Mark Johnson & Sons had a new system in by that evening — they did a real sizing calc instead of just swapping what was there, and the house has never cooled better. Honest quote up front, clean install, and they walked us through everything. Best HVAC experience we've had in Simsboro.”
Julia S.
Simsboro · AC Installation
Mark Johnson & Sons Plumbing
Flat-rate pricing, no surprises. We'll quote before we start.
FAQs
Yes — we're a full HVAC contractor as well as a plumber, so one call covers your whole home. Our licensed techs service and install central AC, heat pumps, gas and electric furnaces, ductless mini-splits, thermostats, and ductwork across all of Simsboro and Lincoln Parish, with the same flat-rate pricing and 24/7 live answering as our plumbing side.
We run same-day HVAC service for most Simsboro calls booked before 2pm, and our 24/7 emergency line handles no-cooling and no-heat calls around the clock — a real dispatcher answers, never a machine. In a North Louisiana summer, a dead AC is a genuine emergency, and our typical urgent response time in Simsboro is under two hours.
We quote the repair honestly first and never push a replacement you don't need. As a rule of thumb, if the system is past 12–15 years, uses phased-out R-22 refrigerant, or the repair runs more than about a third of replacement cost, replacement usually pays for itself in efficiency — especially given how many hours a Simsboro AC runs each year. When replacement is the right call, we size the new system with a real load calculation, not a guess.
Yes. Our Classic Membership includes two tune-ups a year — a spring AC visit and a fall heating visit — which is the single cheapest way to keep a Simsboro system from failing on the hottest or coldest day, hold its efficiency, and protect the manufacturer's warranty. Members also get priority scheduling and a discount on any repairs.
More Mark Johnson & Sons Services in Simsboro
Mark Johnson & Sons runs plumbing and HVAC out of the same dispatch. One call, one trusted team, flat-rate pricing across every service we offer.
Why Mark Johnson & Sons Plumbing
North Louisiana homeowners have leaned on Mark Johnson & Sons for over two decades. Here's why.
Every tech is state-licensed, background-checked, and continuously trained.
Real humans on the phone, techs dispatched fast, any hour, any day.
We quote before we start. No hidden fees. No bait-and-switch.
Shoe covers on, drop cloths down. We leave your home cleaner than we found it.

4.9
300+ Google Reviews
Available Around the Clock
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