Lennox Mini-Split Installation Nationwide

Lennox Mini-Split Installation: The Marietta Owner’s Guide

We install and service Lennox mini-split systems throughout Marietta, and a complete single-zone installation typically runs between $3,500 and $7,500 depending on the unit’s BTU capacity, the wall thickness we’re running lines through, and how far the outdoor condenser sits from the indoor air handler. We stock Lennox-compatible mounting hardware, line sets, and condensate pumps on our trucks because we know that when a mini-split goes down in a Marietta July, waiting three days for a bracket isn’t acceptable. Most owners discover they need a full installation rather than a repair when they get the quote for a failed compressor or a leaking evaporator coil on a unit that’s already eight or nine years old and the math stops making sense.

Call (229) 514-0545

Here’s the reality we see on service calls around Marietta Square: mini-splits get worked hard here. Georgia humidity means these units pull moisture constantly, and that condensate management is usually the first domino. If you’re calling about a unit that’s leaking, icing up, or just not cooling like it used to, you’re not alone. It’s the most common Lennox mini-split service call we run between May and September.

Key Takeaways:

• Complete Lennox mini-split installation in Marietta runs $3,500 – $7,500, with a written price before we start
• We stock Lennox-specific mounting hardware and line set components on our trucks for same-week installs
• Every installation carries our 365-Day Done Right Promise and a written guarantee
• Call (229) 514-0545 and we’ll give you a firm number, not a ballpark

Which Lennox Models This Applies To

We work on the full Lennox mini-split lineup that’s common in Marietta homes: the MLA and MPB single-zone systems, the MPA and M22 multi-zone units, and the newer M0 and M1 series that Lennox has pushed hard through Georgia supply houses over the last few years. If you’ve got a Lennox cassette-style unit in a sunroom or a ducted mini-split air handler in a converted attic, that’s the same platform, just a different indoor form factor.

The compatibility gotcha most Marietta homeowners hit is this: Lennox mini-splits use proprietary communication wiring between the indoor and outdoor units. You cannot mix a Lennox indoor head with a Carrier or Trane condenser, period. The boards won’t talk to each other. We stock Lennox OEM line sets, wiring harnesses, and communication cables, and we also carry quality aftermarket line sets that meet Lennox flare specifications when OEM isn’t necessary. The mounting brackets are universal enough, but the electrical handshake is not. Before we touch anything, we confirm the model numbers on both the indoor and outdoor nameplates and cross-check them against Lennox compatibility charts. That five-minute check has saved more than one homeowner from buying a mismatched component off a shelf somewhere.

Andre Fuller, our owner, learned this lesson years ago working on rooftop package units: the label tells you more than the brochure ever will. We always pull the numbers off the actual equipment before quoting anything.

Signs Your Lennox Mini-Split Installation Is Failing

• Water dripping from the indoor head or staining your wall. A clogged condensate drain line or a failed condensate pump lets water back up and overflow. In Marietta’s humidity, a mini-split can pull a gallon of water out of the air every few hours, so this shows up fast when the drain path is compromised.
• Ice building up on the evaporator coil or the copper lines. Low refrigerant or restricted airflow causes the coil temperature to drop below freezing. The refrigerant leak behind this needs to be found and sealed before you recharge anything, or you’ll be icing up again by August.
• Unit short-cycles or the outdoor condenser shuts off while the indoor fan keeps running. This is usually a failing inverter board or a compressor overload sensor. On Lennox units specifically, a communication fault between the indoor and outdoor boards will trigger a shutdown the unit can’t self-correct.
• Rattling or vibration from the outdoor unit that changes with the compressor cycling. Loose compressor mounts or a failing fan motor bearing create noise that travels through the line set into the wall. We hear this a lot on units mounted on brackets in tight Cobb County side yards.
• Cooling output drops noticeably even though the unit runs constantly. This can be a refrigerant charge drifting low over months, or a compressor that’s losing efficiency. If your electricity bills have crept up while your comfort has crept down, the system is working harder than it should be.

Replacement Cost & What’s Included

A complete Lennox mini-split installation in Marietta runs between $3,500 and $7,500, installed and warranted. What shifts the number is mostly equipment capacity: a 9,000 BTU single-zone for a small home office sits at the low end, while a 24,000 BTU system with a condenser mounted thirty feet from the indoor head lands higher once you factor in the longer line set, additional electrical work, and the time to pull a proper vacuum on the refrigerant circuit.

Every quote we write includes the equipment, the wall bracket or ground pad, the line set, the electrical disconnect, the condensate drain routing, and the labor to commission the system correctly. There’s no “oh, we have to add the wiring” surprise after we start. That’s a Halden rule. We don’t start with a low number and grow it at the door.

Installation work is scheduled, not same-day. Mini-splits require a proper load calculation for the room, ordered equipment where needed, and a set install date. What you get before any tool is picked up is a written fixed price and a committed install window. And every installation carries our 365-Day Done Right Promise: if something isn’t right within a full year, we come back and make it right, no billing department runaround. It’s a written guarantee, not a verbal shortcut.

DIY or Call Us?

There are three things a Marietta homeowner can safely do before calling us: check the air filter on the indoor unit and clean it if it’s choked with dust, clear leaves and debris away from the outdoor condenser, and make sure the condensate drain line isn’t kinked where it exits the wall. That’s the list. Everything beyond that involves either high-voltage electrical work at the disconnect, refrigerant that requires an EPA Section 608 certification to handle, or a vacuum pump and manifold gauge set that most homeowners will never own. And getting the refrigerant charge wrong on a mini-split doesn’t just reduce efficiency; it can destroy the compressor.

Mini-split line sets carry pressurized refrigerant. Cutting into a line set without recovering the charge first is dangerous, and the burn risk from refrigerant exposure is real, not a warning label formality. If your Lennox unit needs anything beyond filter and debris clearing, call us at (229) 514-0545. We’ll show up with the right recovery equipment and a written price before we open a single panel. Straight answer, written price, done right.

FAQs

Get a Written Lennox Mini-Split Installation Price in Marietta

Call Halden Heating and Air Marietta at (229) 514-0545 for a free estimate on your Lennox mini-split installation. You’ll get a live person on the phone, a written price before any work starts, and a guaranteed install date with a tech you can track to your door. No four-hour windows. No voicemail trees. No price changes at the door. Just the right Lennox system for your space, installed correctly, and backed by our 365-Day Done Right Promise.

Written by Andre Fuller, Owner, Halden Heating and Air Marietta, serving Marietta and nearby areas.