Room additions and sunrooms
Building on or finishing a space that’s not on the existing duct system. Ductless handles it without rerouting your whole trunk line.
Ductless Systems
Ductless Mini-Split Systems in Sumter, SC
Heat and cool the spaces central HVAC can’t reach — additions, sunrooms, bonus rooms, detached garages, or whole homes without existing ductwork. Mitsubishi-trained installers, 12-year compressor warranties, single-day installs.
Repair cost approaching replacement? Ask about financing.
Mini-Splits & Multi-Zone
Comfort exactly where you need it — no ductwork required.
Some homes were never built for ductwork. Additions, sunrooms, finished basements, detached garages, ADUs, and second-story master suites that always run too hot — these are spaces that frustrate central systems. A ductless mini-split puts the comfort exactly where you need it, with one outdoor unit feeding one or several wall-mounted, ceiling-cassette, or floor-mounted indoor heads.
As authorized Mitsubishi installers, we’re trained on the full M-Series line — from single-zone wall mounts to whole-home multi-zone heat pump systems. Mitsubishi’s Hyper-Heat models maintain full heating capacity to 5°F, dramatically quieter than window units, and the inverter-driven variable-capacity technology means they run efficiently without the on/off cycling that wears out traditional equipment.
See how we approach every install →
Where Mini-Splits Solve Problems
Six spaces where ductless is the right answer.
If the space is uncomfortable and ducting it is impractical or expensive, ductless is almost always worth the conversation.
Detached structures
Detached garages, workshops, carriage houses, and guest cottages — ductless gives any detached structure its own independent comfort without running new ductwork across the property.
Homes without central ductwork
Pre-war homes, historic properties, and houses that were never built with central HVAC — ductless is often the only practical way to add modern comfort without major renovation.
Hot/cold problem rooms
Bonus rooms above garages, master suites on long duct runs, west-facing rooms — rooms your central system can’t keep comfortable. One head fixes the problem without resizing the whole system.
Whole-home zoning
One outdoor unit feeding 4–8 indoor heads gives every room its own thermostat. Every person controls their space; the house runs efficiently because you’re only conditioning occupied rooms.
Replacing window units
Mini-splits are dramatically quieter, more efficient, and don’t block windows or invite humidity the way window ACs do. One quick retrofit and the window unit goes away permanently.
Recognize any of these? Single-zone installs wrap in a day — let’s get yours quoted.
Our Process
From walkthrough to wireless remote — five steps
Single-zone or whole-home multi-zone — same predictable process.
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Free load assessment
We measure the space, ask how you use it, and confirm the right BTU load for your real-world conditions — not just square footage.
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System selection
Single-zone, multi-zone, ceiling cassette, floor-mount, or concealed duct — we pick the indoor heads and outdoor unit that fit your home and budget.
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Written options
Good / better / best in writing, with financing terms and total install cost. No hidden line items.
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Clean install
Most single-zone installs wrap in one day. Multi-zone systems take two. We protect surfaces and clean up completely.
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Start-up and warranty
We verify performance, register the manufacturer warranty, and walk you through the remote before we leave.
Why homeowners pick Advance for ductless
Mitsubishi-trained. Innovair-authorized. Brand-agnostic on repairs.
- Mitsubishi authorized installer — 12-year compressor warranty on qualifying systems
- Innovair authorized dealer for budget-conscious single-zone applications
- NATE-certified, EPA-licensed technicians on every refrigerant job
- Single-zone installs typically completed in one day
- Written, itemized quotes before any work starts
- Financing available for multi-zone and whole-home systems
Single-zone vs. multi-zone: when each makes sense
Honest framing so you buy what you actually need.
- Single-zone — one outdoor unit, one indoor head; perfect for additions, problem rooms, detached spaces
- Multi-zone — one outdoor unit, multiple heads; good when several rooms need independent control
- Whole-home multi-zone — replaces central HVAC entirely; best for homes without existing ductwork
- Hyper-Heat models — maintain full heating capacity to 5°F, ideal for year-round use in SC
- Concealed duct — indoor head hides in the ceiling for a cleaner look in living areas
- Ceiling cassette — low-profile, four-way airflow, good for open floor plans
Frequently Asked
Ductless system questions, answered straight.
What is a ductless mini-split system?
A heat-pump system with two main parts: a compact outdoor compressor and one or more indoor heads (wall-mounted, ceiling cassette, or floor unit). Refrigerant lines connect them through a small 3-inch hole in the wall — no ductwork, no air handler, no demolition required.
How much does a ductless system cost to install?
Single-zone systems typically run $3,500–$6,500 fully installed. Multi-zone with 2–4 indoor heads: $7,000–$15,000. Whole-home installs are priced per project. Every quote is itemized and in writing, with financing options included.
Can I start with one zone and add more later?
Absolutely — that’s the most common way homeowners start with ductless. We size a single-zone system for the problem room, install it in a day, and you can expand later using the same outdoor unit (within its capacity). Just ask about multi-zone-ready outdoor units at quote time.
Can ductless systems heat a whole home?
Yes — increasingly, that’s what new high-performance homes use. Mitsubishi’s Hyper-Heat models maintain full heating capacity down to 5°F, which is well below what Sumter winters typically bring. Multiple indoor heads on one outdoor unit can cover every zone in the house.
How long do mini-split systems last?
Properly installed and maintained, expect 15–20 years from the outdoor unit and even longer from indoor heads. Mitsubishi backs compressors with a 12-year warranty when installed by a trained dealer — which we are.
Is a permit required for ductless installation?
Yes — refrigerant work requires EPA Section 608 certification, and the electrical connection typically requires a permit. We handle both. Unpermitted refrigerant work creates problems with manufacturer warranties and insurance claims.
Financing & Payment Options
Flexible Financing for Repairs, Replacements & New Systems
HVAC investments shouldn't put your comfort on hold. We work with qualifying customers to spread the cost of repairs, replacements, and indoor air quality upgrades into manageable monthly payments.
Whole-home comfort without the whole-home sticker shock. Multi-zone and whole-home ductless systems qualify for financing. Soft pre-qualification in minutes — no impact on your credit to check.
Subject to credit approval. Financing options, terms, and qualifications may vary by lender and project type. Not all applicants will qualify. Our team can walk you through available options when you request service or an estimate.
Comfort where central HVAC can't go
One-day install. 12-year warranty.
Single-zone additions start at $3,500 installed. Mitsubishi-trained installers, EPA-licensed on every refrigerant job, warranty registered before we leave.