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Cooling

Ductless Mini-Splits in Charleston, SC

Ductless mini-splits deliver heating and cooling to individual rooms without ductwork — ideal for Charleston's historic homes, finished rooms over garages, additions, and any space the main system can't reach. Holy City Heating & Air installs and services ductless systems across the Lowcountry.

What this service covers

A mini-split pairs a compact outdoor unit with one or more indoor heads mounted on a wall or ceiling, connected by a small refrigerant line — no ducts required. Each head is its own zone with its own thermostat.

One outdoor unit can serve multiple indoor heads, so a single system can condition a garage apartment, a sunroom, and a bonus room independently.

Why it matters in the Lowcountry

Charleston's housing stock is full of spaces ductwork was never designed for: 19th-century homes downtown where duct runs would butcher plaster and framing, FROGs that roast every summer, porches converted to living space, and backyard studios.

Mini-splits solve these without tearing the house apart — and they're among the most efficient systems you can buy, with excellent dehumidification for our climate.

Signs it’s time to call

  • One room is always hot in summer no matter what the thermostat says
  • You're finishing a garage, attic, or addition and the main system can't be extended
  • A historic home has no ducts and you want to keep it that way
  • You want independent temperature control in a guest suite or home office

How the visit works

  1. Space assessment

    We measure the space, its sun exposure and insulation, and recommend head placement for even comfort and clean sight lines.

  2. System design

    Single-zone or multi-zone, wall-mounted or low-profile — we design around how you use the space and how the equipment will look in it.

  3. Clean installation

    Typical installs need only a small penetration for the line set. Most single-zone installs are done in a day.

  4. Walkthrough

    We commission the system and show you the remote, modes, and filter care.

What affects the price

Every home is different, so we quote in writing before work begins. The main factors:

  • Number of zones (indoor heads)
  • Head style — standard wall units vs. low-profile or ceiling-recessed
  • Line-set length and routing complexity
  • Electrical work required at the panel

Keeping it running

  • Rinse the indoor unit's washable filters monthly during heavy use — it takes minutes.
  • Keep the outdoor unit clear and, near the coast, rinse its coil gently through the summer.
  • An annual professional deep clean keeps the blower wheel and coil from accumulating the biofilm humid climates encourage.

Ductless Mini-Splits: common questions


Are mini-splits good for Charleston's historic homes?

They're often the best option. Downtown homes were never built for ductwork, and mini-splits condition rooms effectively with minimal alteration to plaster, framing, or historic fabric.

Do mini-splits heat as well as cool?

Yes — they're heat pumps, so each zone heats in winter and cools in summer. In our mild winters they handle heating easily.

Can one outdoor unit run several rooms?

Yes. Multi-zone systems connect several indoor heads to one outdoor unit, each zone controlled independently.

Rainbow Row's pastel historic houses on East Bay Street in Charleston, South Carolina

Y’all deserve to be comfortable.

Schedule an appointment with us today — or call and talk to a real person, until 9 PM.