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Mini-Split Installation

Mini-Split Installation in San Antonio

Ductless comfort for any space — additions, garages, older homes, problem rooms. We design and install single-zone and multi-zone Mitsubishi and RunTru by Trane systems with proper sizing, clean line runs, and full warranties.

Schedule Mini-Split Installation Call (210) 561-COOL

Mini-splits have gone from a niche product to one of our most-requested installations. The reason is simple: they solve problems that central HVAC can't. You added a room over the garage, but your existing system can't reach it. You converted a detached garage into a workshop, and there's no ductwork within 50 feet. Your 1940s bungalow in Monte Vista has plaster walls and no attic space for ductwork. Your master bedroom is always 5 degrees warmer than the rest of the house, and no amount of damper adjustment fixes it. A mini-split handles all of these without tearing open walls or running ducts.

We install Mitsubishi and RunTru by Trane — two very different products for different needs. Mitsubishi is the premium choice: hyper-heating models that work down to -13°F (not that San Antonio needs it, but it tells you about the engineering), whisper-quiet indoor units at 19 dB, and the most sophisticated inverter technology on the market. RunTru by Trane is the value play: solid performance, reasonable price, backed by Trane's parts network. For a garage gym or a guest room, RunTru makes sense. For a primary living space or a whole-home ductless solution, Mitsubishi is the better long-term investment.

Installation quality matters more with mini-splits than with almost any other HVAC equipment. The line set connections, the vacuum level before charging, the mounting angle of the indoor unit, the electrical sizing — all of these affect performance and longevity. A mini-split installed by a general handyman or a contractor who does one or two a year often has problems within the first year: refrigerant leaks at flare fittings that weren't torqued to spec, drain issues from an indoor unit that's not level, short cycling from an improperly sized system. We install dozens of these systems every year and we follow manufacturer installation procedures to the letter. That's what keeps the warranty valid and the system running for 15 years instead of 8.

Why Choose Our Mini-Split Installation Service

Mitsubishi and RunTru by Trane — premium and value options. We help you pick the right brand and model for your space, budget, and usage pattern. No one-size-fits-all recommendations.

Single-zone and multi-zone systems. One outdoor unit can serve up to 5 indoor units, each with independent temperature control. We design multi-zone layouts that balance capacity across zones without overloading the outdoor unit.

Proper sizing for every installation. We calculate the cooling and heating load for each zone — not just square footage, but insulation, window exposure, ceiling height, and heat-generating equipment. An oversized mini-split short-cycles and fails to dehumidify. We size it right.

Clean, professional line set routing. The copper line set and drain line connecting indoor and outdoor units are visible if not done well. We route lines through walls, along eaves, and through chases — not draped across your siding with zip ties.

Full manufacturer warranty on every installation. Warranty terms vary by brand and model — we'll walk you through what's covered for the specific system you choose. Plus our 1-year labor warranty on the installation itself. Proper installation by a certified dealer is required for the manufacturer warranty — DIY or handyman installs void it.

0% financing available through Wells Fargo, Synchrony, and Credit Human. Most approvals in minutes. Federal tax credits may apply for qualifying heat pump mini-splits.

Signs You Need a Mini-Split

Mini-splits aren't a replacement for central HVAC in every situation. But for these specific problems, they're the best solution available.

Room Addition with No Ductwork

You added a room, enclosed a porch, or built above the garage — and your central system doesn't reach it. Extending ductwork to an addition is expensive, often impractical, and puts extra load on a system that wasn't sized for the added space. A single-zone mini-split gives that room its own dedicated cooling and heating for $5,000–$7,000 installed.

Garage Conversion — Workshop, Gym, Office

Garages have zero insulation, concrete floors, and a massive door that leaks air. Even an insulated garage conversion is thermally challenging. A mini-split is the standard solution: it handles the high cooling load, doesn't require ductwork, and gives you independent temperature control. We install a lot of these in San Antonio — home offices exploded post-COVID and haven't slowed down.

Older Home Without Ductwork

Pre-1960s homes in neighborhoods like Monte Vista, Dignowity Hill, Tobin Hill, and Lavaca often have no ductwork at all — they were built with floor furnaces or wall heaters, and window units got added later. A multi-zone mini-split system (one outdoor unit, multiple indoor heads) can replace those window units with efficient, quiet, permanent cooling and heating without destroying historic plaster walls to run ducts.

Hot or Cold Rooms Your Central System Can't Fix

The upstairs bonus room that's always 85° in summer. The master bedroom on the west side that bakes in the afternoon sun. The home office above the garage that your central system treats as an afterthought. If damper adjustments and duct modifications haven't solved it, a supplemental mini-split in that room is cheaper than replacing your entire system with a zoned setup — and it works better because it's dedicated to that space.

Detached Structure — Casita, ADU, Pool House

Running ductwork to a detached structure is rarely feasible. Extending a central system means burying line sets, trenching for electrical, and oversizing the main system. A standalone mini-split gives the detached building its own independent HVAC with minimal site work — just electrical and a line set penetration. We install these for casitas, ADUs, pool houses, and detached workshops throughout San Antonio.

You Want to Eliminate Window Units

Window units are loud, inefficient, block natural light, and create a security vulnerability (an open window). They also drip condensate down your siding and look terrible. A wall-mounted mini-split replaces the window unit with a permanent, efficient, quiet system that heats and cools. The indoor unit mounts high on the wall and only needs a 3-inch hole for the line set — your windows stay closed and locked.

What to Expect

We schedule a site visit to see the space. Mini-split installations require measuring the room, checking wall construction (interior vs. exterior mounting), locating the best position for the outdoor unit, and planning the line set route. There's no charge for the consultation.

We design the system: single-zone or multi-zone, BTU capacity per zone, indoor unit type (wall-mounted, ceiling cassette, or ducted), and outdoor unit placement. You get a written quote with everything included — equipment, labor, electrical, materials, and permits.

Installation typically takes one day for a single-zone system, two days for multi-zone. We cut a small hole (about 3 inches) through the wall for the line set and drain line. The indoor unit mounts on a bracket, the outdoor unit sits on a pad or wall bracket. We run the line set, make the connections, pull a deep vacuum, and charge the system.

Every connection is torqued to manufacturer spec. We pull a vacuum to 500 microns or below (the industry standard is 500, but we aim lower) and hold it to verify no leaks before releasing refrigerant. Flare fittings are tested with an electronic leak detector. Cutting corners here is the #1 cause of premature mini-split failure.

We test the system in both cooling and heating modes, verify airflow and temperature split, confirm the drain is flowing correctly, and pair your remote control or Wi-Fi adapter. We walk you through operating modes, filter maintenance, and optimal temperature settings for San Antonio's climate.

We clean up completely — patch any exterior penetrations with weatherproof sealant, secure line set covers, and haul away all packaging. You get the warranty documentation, our contact info for service, and a recommended maintenance schedule.

Mini-split installation typically costs $5,000–$8,000 per zone in San Antonio.

Multi-zone systems cost $10,000–$20,000+ depending on the number of zones. Includes equipment, labor, electrical, materials, and warranty. 0% financing available.

View Full Pricing Guide

Frequently Asked Questions

A single-zone mini-split installation runs $5,000–$8,000 depending on the brand (Mitsubishi is higher, RunTru by Trane is lower), the BTU capacity needed, and the complexity of the line set routing. A multi-zone system — one outdoor unit serving 2–5 indoor units — ranges from $10,000 to $20,000+. The biggest cost variables are the number of zones, the line set length (longer runs = more copper and labor), and whether electrical work is needed. We provide written quotes with no hidden fees.

Mitsubishi is the premium option: quieter (19 dB indoor), more efficient (20–33 SEER2 depending on configuration — single-zone systems rate highest), better humidity control, longer compressor warranty, and more sophisticated inverter technology. RunTru by Trane is the value option: solid performance, reasonable price, backed by Trane's parts and service network. For a primary living space or whole-home ductless, we recommend Mitsubishi. For a garage, workshop, or supplemental zone, RunTru is a smart choice. We install both and can show you the price difference and warranty details for your specific project.

A single-zone installation is typically completed in one day (4–6 hours). A multi-zone system with 2–3 indoor units takes a full day. Larger multi-zone systems (4–5 zones) or installations with complex line set routing may take two days. We schedule the full time block and don't leave until the system is running, tested, and you're comfortable operating it.

Yes. Every mini-split we install is a heat pump — it provides both cooling and heating from the same unit. In San Antonio's mild winters, a mini-split handles heating easily and efficiently. It's significantly cheaper to operate than electric resistance heat and eliminates the need for a separate furnace in spaces that don't have one. Some customers use their mini-split as the primary heat source and barely touch their central heating all winter.

Wall-mounted units (the most common type) install high on an exterior or interior wall — typically 7–8 feet up. The wall needs to be within about 50 feet of the outdoor unit for the line set run. We position the unit for optimal airflow distribution across the room, avoiding locations that blow directly onto seating or sleeping areas. For rooms where a wall unit isn't ideal, we also install ceiling cassettes (flush-mounted in a drop ceiling) and slim-duct units (hidden above a soffit or in a closet with short duct runs).

A single-zone mini-split needs a dedicated 20-amp or 30-amp circuit (depending on the model). If your panel has space for a new breaker, no upgrade is needed — we just run the circuit. Multi-zone systems with larger outdoor units may need a 40-amp circuit. We evaluate your panel during the site visit and include any electrical work in the quote. Older homes with 100-amp panels that are already full may need a panel upgrade or a sub-panel, which adds $1,500–$2,500. We'll tell you upfront if that's the case.

In most cases, yes — especially for spaces that currently have no HVAC or rely on window units. A permitted, professionally installed mini-split converts an unconditioned space into livable square footage, which directly increases appraised value. A garage conversion with a mini-split, for example, adds a functional room to your home. The energy efficiency and zone control are also selling points in San Antonio's market where cooling costs are a major concern for buyers.

Heat pump mini-splits may qualify for the federal IRA tax credit of up to $2,000 (consult your tax advisor for eligibility). CPS Energy also offers rebates on qualifying high-efficiency heat pump installations. Mitsubishi occasionally runs manufacturer promotions as well. These can stack — you could recover $1,000–$2,500 on a qualifying installation. We provide all the documentation you need to claim these credits and handle the CPS paperwork ourselves.

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