COMMERCIAL HVAC SERVICE IN NORTH LOUISIANA

When the HVAC goes down in a business, it's not just uncomfortable — it's lost revenue, unhappy customers, and staff who can't work. Mark Johnson & Sons keeps North Louisiana businesses running with commercial heating and cooling service: rooftop units, packaged systems, split systems, and the light-commercial equipment that offices, restaurants, retail, and multi-tenant buildings depend on.

The tech who shows up is on our payroll — no subcontractors — and every quote is flat-rate, given before we start, so property managers and owners get a number they can approve without surprises. We answer live 24/7 when something fails, because a walk-in cooler's makeup air or a packed dining room in a humid Louisiana summer can't wait until Monday.

What we service

• Rooftop units (RTUs) and curb-mounted packaged systems — gas/electric and heat-pump packages from Carrier, Trane, Lennox, York, Goodman, and Rheem
• Light-commercial split systems and mini-splits — Daikin and Mitsubishi zoning for offices and back rooms
• Controls and thermostats — programmable and networked controls, economizers, and staging
• Refrigerant and electrical — R-410A recharge and leak search, contactors, capacitors, compressors, and blower motors
• Makeup-air and exhaust-adjacent issues — the airflow problems restaurants and kitchens live with

Repair vs. replace

On commercial equipment the math comes down to age, the cost of the repair against a new unit, and how much the current one is costing you in utilities. A newer RTU with a single failed part is almost always a repair; an older unit that keeps failing and driving up the power bill usually pencils out to replace, especially when downtime is costing you customers. Older rooftop units also tend to slip in efficiency well before they die, so a five- or six-figure utility spend across a multi-unit building can quietly justify a changeout. We give you the honest numbers and a flat-rate quote on both, and schedule replacements to minimize the hours you're down.

What Mark Johnson & Sons does differently

We handle scheduled preventive maintenance that keeps units out of the emergency category in the first place — the single biggest thing that keeps a commercial system off the failure list. One licensed local crew installs, maintains, and repairs your equipment, so there's one number to call and one team accountable to your building. Ask about pairing your commercial service with our service savings agreement plans coverage on the plumbing side — one relationship for the whole property, priority scheduling, and flat-rate quotes across the board.