75 Degree AC

Mini-Split AC Installation in Houston TX — Mitsubishi, Daikin & Multi-Zone Specialists

If you have a Heights garage office that hits 95°F by noon, a Memorial bonus room above the garage that never cools right, or a Spring Branch sunroom that swings 15°F warmer than the rest of the house, mini-split installation is the only realistic fix

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How a Ductless Mini-Split Cools Your Houston Home

A mini-split has two components connected by a refrigerant line set — an outdoor condenser and one or more indoor air handlers. A **single-zone** system pairs one outdoor unit with one indoor head. A multi-zone system pairs one outdoor unit (Mitsubishi MXZ or Daikin MXS, for example) with two to eight indoor heads, each controlled independently. No ductwork, no central air handler, no losses through the attic. The piece that matters most in Houston is the inverter compressor. Older single-stage air conditioners run flat-out or off. Inverter compressors modulate speed continuously, so the system runs longer at lower capacity instead of cycling hard. That is why mini-splits routinely hit SEER2 20 to 22, while central AC under current 2025 federal standards is required to hit only SEER2 14.3 minimum in the South. In Houston, where systems run roughly 2,500 hours per year, that part-load efficiency compounds — your power bill reflects it.
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When a Mini-Split Is the Right Choice for Your Houston Space

Mini-split is not a replacement for a central system in most Houston homes. It is the right answer when you have a specific room or structure that the central system cannot reach, or when adding ductwork is not realistic.
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Sunroom with east or west glass exposure (Spring Branch, Bellaire)

Glass exposure on the east or west side of a Houston home loads heat in the afternoon faster than supply ducts can keep up. A dedicated single-zone in the sunroom takes the load off the central system and lets it actually catch up everywhere else.

Older Heights or Montrose bungalow with one perpetually hot room

If the rest of the house is comfortable but one bedroom is always warm, the issue is usually duct leakage, return-air shortage, or a long-supply run problem.

Home addition, ADU, or in-law suite

When you build out a garage apartment, a guest suite, or an addition off the back of the house, running new ductwork is expensive and disruptive.

Bonus room above the garage (Memorial, Sugar Land newer builds)

Bonus rooms above garages are notorious for running 10°F hotter than the rest of the house, because the central system was sized for the original floor plan and the attic above the garage is unconditioned.

Detached garage office (Heights, Montrose 1920s–1960s homes)

Old Heights and Montrose lots commonly have a detached garage that has been converted to an office, studio, or guest room.

Mini-Split Systems We Install for Houston Homes

Houston homes come in all shapes and layouts, and not every space connects to existing ductwork. These are the most common ductless mini-split installation types we handle across the Houston metro area.

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Single-Zone Wall Mount

A single indoor unit paired with one outdoor condenser is the simplest way to add cooling where ductwork does not exist. Our licensed contractors mount the indoor head, run the line set through a small wall opening, and connect everything to a dedicated outdoor unit. This setup works well for bedrooms, home offices, and converted spaces that need independent temperature control.
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Multi-Zone Whole-Home System

A multi-zone mini-split uses one outdoor unit connected to multiple indoor heads placed throughout the home. Our team sizes each zone based on square footage, insulation, and sun exposure, then runs separate line sets to each room. This option works best for homes where ductwork is not practical or where room-by-room control is the priority.
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Garage & Workshop Cooling

Garages and workshops in Houston get dangerously hot during summer months. We install wall-mounted mini-splits rated for non-insulated and semi-insulated spaces, with proper electrical and drainage built into the install. Our contractors position the unit away from dust and debris zones to keep the system running cleanly over time.
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Home Addition or Sunroom

New additions and enclosed sunrooms rarely connect to the existing central system. A dedicated mini-split gives the new space its own cooling zone without overloading the main system. We handle the full installation, including the indoor unit, line set routing, outdoor unit placement, and electrical connections.
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Window Unit Replacement

Window units block natural light, leak air, and run up utility bills. A wall-mounted mini-split replaces the window unit with a permanent, efficient cooling solution. Our technicians remove the old setup, seal the window, and install the ductless system with a clean, finished look.
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Best Mini-Split Brand for Each Houston Application

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Quietest bedroom retrofit

Fujitsu Halcyon Runs 19 dB on lowest fan speed, quieter than a whisper.

Houston cold-snap heating

Mitsubishi Hyper-Heat MSZ-FS Heats reliably down to –13°F.

Humidity control priority

Daikin Quaternity Genuinely better dehumidification mode than the rest of the market.

Budget multi-zone

Bosch BMS or LG LMU Mid-tier price with strong build quality.

Premium concealed aesthetics

LG Art Cool Gallery or Mirror Picture-frame mounting with a custom artwork insert or a mirrored finish

Mini-Split Brands We Install in Houston

Every other Houston ductless contractor we know of says “all major brands installed.” That tells you nothing, and usually means they install whatever the wholesaler stocked this week. We name what we install and why.

Mitsubishi Electric

The most-installed mini-split brand in our Houston jobs. Three product tiers we work with: M-Series wall mount : entry tier for standard single-zone installs. Reliable, simple, well-supported parts pipeline. MSZ-FS Hyper-Heat : the cold-climate model. Heats reliably down to –13°F. After the January 2024 Houston freeze, this is the model we recommend for any install where winter heating matters — bonus rooms, ADUs, detached garages.

Daikin

Strong second choice and the standout pick when humidity control is the priority complaint in your Houston home. Aurora : cold-climate spec, reliable heating down to –4°F, good Houston cold-snap option. Quaternity : humidity-control standout, genuinely better dehumidification mode than the rest of the market. MXZ multi-zone outdoor units : pair one outdoor with multiple indoor heads, same logic as Mitsubishi MXZ.

Fujitsu Halcyon

Best dB rating in the class and the right pick when the install is in a bedroom or shares a wall with one. Halcyon Single-Zone wall mount : 19 dB on lowest fan speed, quieter than a whisper for bedroom retrofits. Halcyon Multi-Zone XLTH : extra-low-temp heating spec for reliable winter performance in detached structures. AOU multi-zone outdoor units : pair one outdoor with up to eight indoor heads. FGLair app : WiFi control, scheduling, and remote monitoring.

LG

Premium aesthetics pick and the right answer when the indoor head has to look intentional, not utilitarian. Art Cool Gallery : picture-frame mounting with custom artwork insert, blends into modern interiors. Art Cool Mirror : mirrored finish indoor head, near-invisible on a wall. LMU multi-zone outdoor units : pair one outdoor with up to eight indoor heads of mixed styles. LG ThinQ app : WiFi control, voice-assistant integration, and per-zone scheduling.

Bosch BMS

Best ROI pick when the priority is multi-zone coverage at the lowest defensible price without sacrificing build quality. Climate 5000 single-zone : mid-tier price with strong SEER2 efficiency and quiet operation. BMS Multi-Zone : sourced from Carrier-owned production, reliable parts pipeline. IDS Premium Connected : WiFi control built into select models, no add-on module required. Bosch HVAC app : scheduling, remote control, and basic diagnostics.
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Ductless Mini-Split Installation Backed by Years of Houston Experience

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Mini-split installation is precision work. Where the indoor unit sits, how the line sets routes, and which outdoor condenser matches the layout all affect how well the system performs long-term. 75 Degree AC handles this work daily across Houston, from single-zone garage cooling to full multi-zone systems that replace central air entirely. Our licensed contractors work with Mitsubishi, Daikin, Fujitsu, and other top ductless brands. We match the right unit to the room size, ceiling height, and sun exposure so the system runs efficiently without overshooting or falling short. Every quote includes equipment, labor, line sets, electrical, and permits with no add-ons after the price is set. Every mini-split we install is charged, started, and verified cooling on site before the job closes. Permits are handled where required, and same-day scheduling is available for standard single-zone projects across Houston.
Pricing Guide

How Much Does Mini-Split Installation Cost in Houston?

Single-Zone System

$3,500 - $5,500

Two-Zone System

$6,500 - $9,500

Three-Zone System

$9,500 - $13,500

Four-Zone & Whole-Home Multi-Zone

$14,000 - $22,000+

Blower Motor Replacement

$700 - $1,200
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What changes your final price

BTU sizing:

12K, 18K, 24K, 30K, 36K. Manual J load calc determines this; we do not guess

Brand tier:

Mitsubishi and Daikin at top, Fujitsu mid-upper, LG and Bosch mid-tier

Line set length:

over 50 feet adds material cost and additional refrigerant charge

Electrical:

new 240V dedicated circuit is typically $250 to $500; sub-panel upgrade adds morenew 240V dedicated circuit is typically $250 to $500; sub-panel upgrade adds more

Houston permit fee:

$250 to $400 typical

Concealed line set vs surface-mount line hide kit:

concealed adds 1–2 hours labor

Signs a Mini-Split System Is the Right Choice for Your Home

Not every home needs a full central system replaced or expanded. A ductless mini-split can solve specific cooling problems faster and at a lower cost. Our licensed contractors recommend mini-split installation in Houston when one or more of these situations apply.

Why 75 Degree AC Is Houston's Go-To for Mini-Split Installation

Single & Multi-Zone Experts

Our licensed contractors install single-zone wall mounts, ceiling cassettes, and multi-zone whole-home layouts. We size each system to the space and match the right setup to the cooling demand so the unit runs efficiently from day one.

All Major Brands Installed

We install mini-split systems from Mitsubishi, Daikin, Fujitsu, and other leading brands. Our team helps you choose the right unit based on room size, energy ratings, and budget so you get lasting performance.

Permit & Code Handled

Texas requires permits for many mini-split installations, and local codes vary by municipality. We pull the permits, schedule the inspections, and make sure every install meets current electrical and mechanical code requirements.

Clean & Professional Mounting

Line sets are routed neatly through walls or along exterior surfaces, and all penetrations are sealed against moisture and pests. Our technicians leave the workspace clean and the finished install looking like it belongs in the room.

Our Houston Mini-Split Installation Process

This is the part most contractors skip. We do not skip it.

Free in-home assessment with Manual J load calculation : A 30-minute visit. We measure the space, check insulation, ductwork (if any), window exposure, and ceiling height. Then we run a Manual J load calculation.
Brand and zone recommendation with written quote : You see the specs, the price, the warranty, and the install timeline before you authorize anything. No surprises after.
We pull the Houston Building Department permit : Online application typically approved in 1 to 3 business days. We do not install off the books. Unpermitted installs void manufacturer warranties
Indoor unit placement and outdoor pad prep :Indoor head placement matters more than buyers expect. We look at sightlines, supply throw, return air path, and condensate drain routing before drilling anything
Line set, electrical (240V dedicated circuit), and condensate drain :Concealed line set when the wall cavity allows or a professional line hide kit when it does not. We use UV-rated insulation only because cheap insulation breaks down in the Houston sun within two years, and the line set fails.
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Houston Permit, Electrical, and Code Requirements

Houston requires a mechanical permit for any HVAC installation or change-out, including mini-splits. Houston Code makes unpermitted installs illegal. Beyond the legal question, here is what actually happens when work is done without a permit:
Mini-splits also need a dedicated 240V circuit in most cases. Some 9K to 12K BTU single-zone units operate on 120V, but we verify circuit capacity during the Manual J assessment. If your panel cannot support another 240V load, we coordinate a subpanel upgrade with a licensed Houston electrician before install day.

Our Recent Projects in Houston

How a Ductless Mini-Split System Cools Your Space

A mini-split works by moving heat from inside your room to the outdoors. The indoor unit pulls warm air across an evaporator coil filled with cold refrigerant. That refrigerant absorbs the heat, changes from liquid to gas, and travels through a copper line set to the outdoor condenser. The compressor pressurizes the gas, and the condenser coil releases the heat outside. The refrigerant cools back down, returns to liquid form, and cycles back to the indoor unit to repeat the process. Because there is no ductwork involved, all the cooled air goes directly into the room the indoor unit serves. Each zone runs independently, so you only cool the spaces you are using. Most modern mini-splits use inverter-driven compressors that adjust speed based on demand instead of cycling on and off. That means quieter operation, less energy waste, and more consistent temperatures throughout the day.
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What Parts Of Houston Does 75 Degree AC Serve?

75 Degree AC provides HVAC services across Houston TX, supporting residential and light commercial properties throughout the city. Our service coverage reflects how HVAC demand actually works in Houston, from central neighborhoods to outer city districts. Customers rely on us for consistent service standards, clear communication, and dependable system support city-wide.

Downtown
East Downtown (EaDo)
Westwood
Midtown
Spring Branch (Central, TX)
University Place
Montrose
Gulfton
Meyerland
The Heights
Westbury
Eastwood
River Oaks
Memorial
Harrisburg / Manchester
Third Ward
Lazybrook / Timbergrove
Spring Branch (East Houston)
South Belt / Ellington
Trinity / Houston Gardens
Clear Lake (Houston City Portion)
Richmond

About Houston, TX

Houston, TX is home to thousands of older houses, bungalows, and mid-century builds that were never designed with central ductwork. Neighborhoods like The Heights, Garden Oaks, and Oak Forest are full of homes where adding traditional duct runs means tearing into walls and ceilings. A ductless mini-split gives these homes reliable cooling without the construction headache. Newer suburban areas like Katy, Pearland, and Sugar Land see a different need. Room additions, converted garages, and bonus rooms built after the original construction often sit outside the reach of the central system. Houston’s sprawling footprint and year-round cooling demand make ductless systems a practical choice for homeowners who need targeted comfort. The cooling season stretches from March through November, and spaces without dedicated AC quickly become unusable. 75 Degree AC provides mini-split installation across the entire Houston metro, from inner-loop neighborhoods to the surrounding suburbs, with TACLA-licensed contractors available seven days a week.

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Faq

Frequently Asked Questions

Do You Need a Permit to Install a Mini-Split System in Texas?

Most Texas municipalities require a permit for mini-split installation because it involves electrical work and refrigerant handling. We pull the necessary permits and schedule inspections so the job meets all local code requirements before the system goes live.

What Is the Difference Between a Single-Zone and Multi-Zone Mini-Split?

A single-zone system pairs one indoor unit with one outdoor unit and cools one room. A multi-zone system connects multiple indoor units to a single outdoor condenser, allowing independent temperature control in several rooms without running separate outdoor units for each space.

Can a Mini-Split System Cool an Entire House Without Ductwork?

A multi-zone mini-split system can cool an entire home by placing individual indoor units in each room or area. Our team sizes the outdoor condenser and each indoor head to match the square footage and cooling load, giving you whole-home comfort without any ductwork.

How Long Does a Typical Mini-Split Installation Take in Houston?

A single-zone mini-split installation usually takes between four and six hours. Multi-zone systems with three or more indoor units may take a full day or extend into a second morning depending on line set routing and electrical work involved in the layout.