How Does a Ductless Mini-Split Work?

A ductless mini-split system consists of two main components: a small outdoor compressor unit and one or more indoor air-handling units mounted on your wall. The two are connected by a thin refrigerant line that passes through a small 3-inch hole in the wall — no ductwork required.

Each indoor unit has its own thermostat and remote control, giving you independent temperature control in every room. This is called "zone control" — you can heat the living room to 72°F while keeping the bedroom at 68°F, and you're not paying to heat or cool rooms no one is using.

Mini-splits both heat and cool. Like heat pumps, they're extremely energy efficient — delivering 2–3x more heating energy than they consume in electricity.

Ductless Mini-Splits Are Perfect For

Home additions & converted spaces — added a room but didn't extend the ductwork? A mini-split solves it

Garages & workshops — year-round comfort in your garage without running ductwork from the house

Basements & bonus rooms — spaces that are always too hot in summer or too cold in winter

Older homes without ductwork — many older Auburn homes use baseboard heat with no ducts. Mini-splits add cooling and more efficient heating without a major renovation

ADUs & mother-in-law suites — independent climate control for accessory dwelling units

Home offices — keep your workspace comfortable without heating/cooling the whole house

Rooms with hot/cold spots — that one room that's always the wrong temperature finally gets its own control

Premium Mini-Split Brands We Install

Mitsubishi Electric
The #1 selling ductless mini-split brand in the United States. Known for whisper-quiet operation, exceptional efficiency ratings, and reliable performance in cold climates. Mitsubishi's Hyper-Heating INVERTER (H2i) technology delivers full heating capacity even at -13°F.

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Daikin
The world's largest HVAC manufacturer. Daikin mini-splits offer outstanding efficiency, compact design, and a strong warranty. Their inverter technology adjusts compressor speed in real-time for precise temperature control and maximum energy savings.

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Mini-Split Installation Pricing

Single-zone system (1 indoor unit): Starting at $4,200

Dual-zone system (2 indoor units): Starting at $8,000

Multi-zone system (3–4 indoor units): Starting at $12,000

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Mini-split pricing is based on the number of zones (indoor units), the brand and model selected, and the complexity of the installation. We'll give you an exact quote during your free in-home estimate.

Financing available with low monthly payments.

Mini-Split Rebates & Tax Credits

Ductless mini-splits qualify for valuable rebates and tax credits — the same ones available for whole-home heat pumps:

PSE (Puget Sound Energy) Rebates — up to $600 for qualifying ductless heat pump systems
Federal IRA Tax Credits — up to $2,000 for qualifying heat pump systems (mini-splits qualify)

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💰 Combined savings of up to $2,600 — a $4,200 single-zone mini-split could cost you as little as $1,600 after rebates and tax credits. We'll help you maximize your savings.

Frequently Asked Questions — Ductless Mini-Splits

How long does mini-split installation take?
A single-zone mini-split installation typically takes 4–6 hours and is completed in one day. Multi-zone systems may take a full day or extend to a second day.

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Are mini-splits noisy?
No. Modern mini-splits are among the quietest HVAC systems available. Indoor units operate at about 19–32 decibels — quieter than a whisper. You'll barely know it's running.

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Do mini-splits work for heating too?
Yes. Ductless mini-splits are heat pumps — they both heat and cool. Modern systems like Mitsubishi's Hyper-Heating maintain full heating output even in sub-zero temperatures.

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Will a mini-split look bad on my wall?
Modern indoor units are sleek and compact — typically about 32 inches wide and 12 inches tall. They mount high on the wall near the ceiling and are designed to blend in. Many homeowners are surprised at how unobtrusive they are.

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Can I add more zones later?
Yes. If you start with a single-zone system, you can often add additional indoor units to the same outdoor compressor later, depending on the model. We'll plan for this possibility if you think you might expand.

Mini-Split Installation Throughout South King County

Active Heating & Cooling LLC installs whole-home heat pump systems throughout Auburn and the surrounding communities:Auburn · Kent · Renton · Covington · Black Diamond · Federal Way · Maple Valley · Pacific · Algona · Sumner · Bonney Lake, Seattle, Bellevue, Redmond, Kirkland, Everett, Lacey, Olympia, Tacoma, Lakewood, Fife, Whether you're upgrading from a gas furnace in Auburn, replacing an aging heat pump in Kent, or going all-electric in Renton — we're your local heat pump experts.

Ready for a Mini-Split? Get Your Free Estimate.

Find out how a ductless mini-split can solve your heating and cooling problems — with no ductwork, no major renovation, and up to $3,200 in available rebates.

📞 Call or Text: (206) 900-4662

Active Heating & Cooling LLC — Auburn, WA — Licensed & Insured — EPA 608 Certified