12-Year Warranty Included on AllDiamond Elite Installations*
Mitsubishi Ductless Mini-Split Systems
Room-by-room heating and cooling with no ductwork required — designed and installed across the San Francisco Peninsula by a Mitsubishi Electric Diamond Contractor Elite.
Wall-mounted · Living room
Ceiling cassette
Floor-mountedMitsubishi ductless mini-split installation from a Diamond Contractor Elite
A Mitsubishi ductless mini-split is a heat pump that heats and cools individual rooms without ductwork. A compact outdoor unit connects through a small refrigerant line set to one or more indoor units — wall-mounted, ceiling cassette, floor-mounted or ducted concealed — and each room gets its own temperature control. Alternative HVAC Solutions designs and installs Mitsubishi ductless systems for homes from Burlingame to Los Altos, including remodels, additions, ADUs and Eichler homes, from our San Carlos headquarters.
Indoor Unit Styles
Mitsubishi indoor unit styles: wall, ceiling cassette, floor & ducted
Mix and match styles on one system. We recommend the right one for each room during your in-home assessment.
Wall-mounted mini-split
The most popular ductless style: a slim unit mounted high on the wall that heats and cools one room quietly and efficiently.
- 3D i-See Sensor® locates people in the room and directs airflow toward or away from them
- Select models operate as low as 19 dB(A) — quieter than a whisper
- Pairs with Hyper-Heating INVERTER® (H2i®) outdoor units for full winter heating
Install note: mounts on an interior or exterior wall; the line set exits through a small opening and runs to the outdoor unit in a paintable cover.
Recessed ceiling cassette
Sits flush with the ceiling so only a clean grille shows — ideal when wall space is taken by windows, art or cabinetry.
- Flush, architectural look with nothing on the walls
- Distributes air from above for even room coverage
- Combines with wall units on one multi-zone outdoor unit
Install note: requires a ceiling cavity or joist bay. Flat-roof Eichlers usually call for wall or floor units instead.
Floor-mounted mini-split
A low-profile console that sits where a radiator or baseboard heater used to — perfect for rooms with low walls or lots of glass.
- Delivers warm air at floor level, where you feel it most
- Fits beneath windows and under sloped ceilings
- Easy-access filter for simple homeowner maintenance
Install note: a common replacement for failed radiant floor or electric baseboard heat.
Ducted concealed mini-split
A compact air handler hidden in an attic, crawlspace or soffit that serves one or more rooms through short duct runs — only small grilles show.
- Invisible installation with discreet supply and return grilles
- One unit can condition multiple adjacent rooms
- Mixes with wall or cassette units on the same outdoor unit
Install note: needs attic, crawlspace or soffit space for the unit and short duct runs.
How Ductless Saves Energy
Mitsubishi mini-split efficiency vs. baseboard heat and gas furnaces
Heat delivered per unit of energy used
Higher is better. A heat pump moves heat instead of making it.
Typical range; varies by model and outdoor temperature (light blue).
No duct losses
ENERGY STAR estimates a typical home loses 20–30% of the air moving through its ducts to leaks and poor connections. Ductless units deliver conditioned air straight into the room.
Condition only occupied rooms
Each zone has its own setpoint — turn the guest room off instead of heating the whole house.
INVERTER-driven compressor
Ramps speed up and down to hold temperature steadily instead of cycling on and off like a furnace.
System Layouts
Single-zone vs. multi-zone Mitsubishi mini-split systems
Both use one outdoor unit. The difference is how many indoor units — and rooms — it serves.
Single-zone
1 outdoor : 1 indoorHome office
Outdoor unitBest for: one problem room, an addition, ADU or garage conversion.
Multi-zone
1 outdoor : up to 8 indoor (select models)BedroomKitchenLivingKids’ roomsOne multi-zone outdoor unitBest for: whole-home comfort without ducts — each room keeps its own temperature from one quiet outdoor unit.
Eichler & Mid-Century Homes
Ductless mini-splits for Eichler homes in Palo Alto, San Mateo & beyond
Eichlers were built with flat roofs, open beams and in-floor radiant heat — and no room for ductwork. Low-profile Mitsubishi wall and floor units add efficient heating and true air conditioning without changing the architecture, and they’re a proven replacement when radiant systems fail.
Rebates & Pricing
Mitsubishi mini-split rebates and cost on the Peninsula
We check every program you qualify for and help with the paperwork.
For eligible customers replacing gas heating with an all-electric heat pump.
No-money-down, zero-interest financing for qualifying heat pump HVAC projects.
Bay Area Regional Energy Network incentives may be available for qualifying upgrades.
What affects the cost of a ductless system?
- Number of zones (indoor units)
- Indoor unit styles chosen
- Line-set length and routing
- Electrical panel or circuit upgrades
- Permits and incentive eligibility
†Program availability, amounts and terms change; eligibility requirements apply. See current heat pump rebates.
Ductless FAQ
Mitsubishi ductless mini-split FAQs
What is a ductless mini-split?
A ductless mini-split is a heat pump that heats and cools individual rooms without ductwork. An outdoor unit connects through a small refrigerant line set to one or more indoor units, and each indoor unit has its own temperature control.
How many rooms can one Mitsubishi outdoor unit serve?
A single-zone Mitsubishi system serves one room. Multi-zone outdoor units connect several indoor units — up to eight on select models — each with its own thermostat.
Should I choose a single-zone or multi-zone mini-split?
Choose single-zone to fix one problem room, an addition or an ADU. Choose multi-zone when you want several rooms or the whole home conditioned from one outdoor unit while keeping room-by-room control.
Which Mitsubishi indoor unit style is right for my room?
Wall-mounted units suit most bedrooms and living areas. Recessed ceiling cassettes suit kitchens and rooms with little free wall space. Floor-mounted consoles suit low walls, sunrooms and Eichlers. Ducted concealed units hide in an attic or soffit to serve adjoining rooms with only small grilles showing.
Do Mitsubishi mini-splits heat well in winter?
Yes. Mitsubishi Hyper-Heating INVERTER® (H2i®) systems are designed to keep heating in sub-freezing temperatures, far colder than Peninsula winters, so a mini-split can be your primary heat source.
Can a ductless mini-split replace Eichler radiant floor heat?
Yes. When an Eichler’s in-floor radiant system fails or becomes too costly to repair, low-profile Mitsubishi wall or floor units provide efficient heating plus air conditioning without the need for ducts or an attic. Learn more about Eichler ductless HVAC.
Can I add a mini-split to a home that already has central heating?
Yes. Many homeowners add a single-zone Mitsubishi mini-split to fix a hot upstairs bedroom, a home office, a sunroom or a new addition without replacing the existing system.
Will I see the refrigerant lines outside my home?
Line sets run through a small opening in the wall and are typically enclosed in a slim, paintable line-hide cover routed neatly to the outdoor unit.
Do mini-splits dehumidify?
Yes. Mitsubishi mini-splits remove moisture while cooling, and many models offer a dedicated dry mode for humid days.
How much does a Mitsubishi ductless system cost?
Cost depends on the number of zones, the indoor unit styles, line-set routing, electrical upgrades and permits. A free in-home estimate gives you a written, itemized price with your rebates shown.
Are ductless mini-splits eligible for rebates on the Peninsula?
Often, yes. Heat pump rebates and 0% financing through Peninsula Clean Energy, plus BayREN incentives, may apply when you replace gas heating with a qualifying heat pump. Programs change, so we confirm current eligibility in your quote.
How long does a ductless installation take?
It depends on the number of zones and the home. Your written proposal includes a project timeline before any work begins. Read about mini-split mold prevention.
How do I maintain a Mitsubishi mini-split?
Check and clean the indoor filters regularly and schedule professional maintenance about once a year to clean coils and keep the system running efficiently and free of mold.
Get a Custom Ductless Quote in 24 Hours.
Tell us which rooms need help. We’ll design your Mitsubishi ductless system, size every zone and itemize your rebates.
- No-pressure, written proposal
- Rebate paperwork help
- 12-year warranty on qualifying installs*
