Lennox Mini-Split Installation Nationwide

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

We install Lennox mini-split systems in Marietta homes for a typical installed price of $3,500 to $7,500, depending on the number of indoor heads and the outdoor unit’s capacity. Most installations take one to two days, and we carry the common components on our trucks so we can often start right away. The way owners usually find us: the existing system is either dead or limping along, and the part that failed is no longer made or costs more than a full replacement.

Call (478) 662-5175

Devin Marlowe has walked through enough Marietta attics and crawl spaces to know the difference between a part worth saving and a system that is quietly telling you it is done. If your Lennox unit is blowing warm air, icing up, or throwing an error code on the display, this page explains what you are looking at and what a fix actually costs here in Cobb County.

Which Lennox Models This Applies To

We work on the full Lennox mini-split line: the MLA and MWMA single-zone series, the MPB and MPA multi-zone outdoor units, and the older MS8 and MS7 wall-mount heads still common in Marietta homes built in the early 2000s. The critical thing to check before ordering any part is the model plate on the side of the outdoor unit or inside the indoor head. It lists the exact model number, refrigerant type, and electrical specs, and it is the only reliable way to match a replacement part. We have seen too many homeowners order a part online based on a photo, only to find the connector or voltage does not match.

For Lennox specifically, OEM parts are worth the extra cost on control boards, inverter drives, and sensors. Those components communicate with the Lennox firmware in ways aftermarket boards often get wrong. For basic items like capacitors, fan motors, and drainage pumps, quality aftermarket equivalents from suppliers we trust work fine and cost 20 to 40 percent less. We will tell you which is which and why before you spend a dollar.

We are an independent service provider serving Marietta and the surrounding Cobb County area, not affiliated with Lennox. But we service their equipment every week, and we stock the common failure parts for the series listed above.

Signs Your Lennox Mini-Split Installation Is Failing

• Warm air from the indoor head while the outdoor unit runs constantly. This usually means low refrigerant from a slow leak, or a failing inverter compressor that can no longer ramp up to full capacity. In Marietta’s summer humidity, you will notice it within a day.
• The indoor unit is blowing air but the outdoor fan is not spinning. That points to a failed outdoor fan motor or capacitor. The compressor will overheat and shut down on thermal overload, and repeated cycling like that shortens its life fast.
• Ice forming on the indoor coil or along the refrigerant lines. Low refrigerant, a dirty blower wheel, or a failed thermistor all cause this. Running it iced up can slug the compressor with liquid refrigerant and destroy it.
• Water leaking from the indoor head or dripping down the wall. A clogged condensate drain line or a failed drain pump. This is the most common issue we see in older Marietta homes, and the water damage it causes gets expensive quickly.
• Error codes flashing on the display that will not clear. Lennox units use codes to point at a specific sensor, board, or communication fault. Guessing at the code usually means buying parts you do not need. We read the code, test the component, and replace only what failed.

Replacement Cost & What’s Included

A full Lennox mini-split installation in Marietta typically runs $3,500 to $7,500, and the spread depends on the number of indoor heads, the outdoor unit’s BTU rating, and the distance between the indoor and outdoor sections. A single-zone 12,000 BTU system in a bedroom or garage sits at the lower end. A multi-zone system with three or four heads across a whole home lands at the upper end.

That price includes the equipment, line set, electrical connection, drainage, a pad or wall bracket for the outdoor unit, and all labor. Before any work starts, you get a written price with the equipment model, refrigerant charge, and labor broken out. No surprises, no hidden fees. Our installation carries a 365-day Done Right Promise: if the system fails within that year because of our workmanship, we return and fix it at no charge. The Lennox manufacturer warranty covers the compressor and parts separately, and we will register it for you.

Mini-split repairs outside of full installation run $150 to $650 in Marietta, matching typical AC repair pricing for this market. If your system can be saved with a single component, we will tell you that plainly and quote the repair.

DIY or Call Us?

Some things are worth checking yourself before you pick up the phone. Make sure the breaker is on, the outdoor unit is not buried in leaves or dog hair, and the indoor filters are clean. Those are safe, and they solve a surprising number of calls. But anything involving refrigerant, the electrical panel, or the inverter board is a job for a licensed technician. A mini-split holds refrigerant under pressure and runs on 240 volts. A wrong connection or a refrigerant leak into your living space is not worth the money you might save.

If you have checked the simple things and the unit is still not cooling, call us at (478) 662-5175. We will give you a straight answer and a written price before any parts go in.

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