Ductless Mini-Split Installation in Milpitas, CA

When is a ductless mini-split the best choice?

A mini-split makes the most sense when adding or fixing ducts would be hard, costly or not possible. Common examples:

• Homes without ducts. Many older Bay Area homes were built with wall heaters or baseboard heat and no ductwork.
• Additions and conversions. A new bedroom, garage conversion or ADU often can’t be reached by the existing ducts.
• Problem rooms. A bonus room, sunroom or upstairs bedroom that is always too hot or too cold.
• Different comfort needs. A home office, nursery or guest room that needs its own setting.

Do I need a single-zone or multi-zone mini-split?

It depends on how many rooms you want to heat and cool. A single-zone mini-split pairs one outdoor unit with one indoor unit, which is the simplest choice for one room, an addition or an ADU. A multi-zone mini-split connects one outdoor unit to two or more indoor units, so several rooms, or a whole home without ducts, each get their own temperature.

What does being a Mitsubishi Diamond Contractor mean for me?

Upgrade Home Services is a Mitsubishi Electric Diamond Contractor. Diamond Contractors complete Mitsubishi Electric’s highest level of product training, so your system is designed, sized and installed the way Mitsubishi intends. It can also mean a longer warranty:

	Parts	Compressor
Installed by a Diamond Contractor and registered within 90 days	12 years	12 years
Mitsubishi’s standard warranty	5 years	7 years

As of November 2026, Mitsubishi Electric says the 12-year limited warranty applies to systems installed by a Diamond Contractor in a single-family home, registered within 90 days of installation, while the original owner lives in the home. Source: Mitsubishi Electric, product registration. We register your system with Mitsubishi for you, so it is eligible for the longer warranty.

How does a ductless mini-split work?

A mini-split has two main parts: an outdoor unit and one or more indoor units. A small set of refrigerant lines and a wire run through a small hole in the wall to connect them. Like any heat pump, it moves heat. In winter it brings heat in from outdoors, and in summer it moves heat out. Each indoor unit has its own controls, so you can heat or cool only the rooms you are using.

Should I choose a mini-split or a central heat pump?

Both are heat pumps. The main difference is how the air gets to your rooms.

	Ductless mini-split	Central heat pump
Ducts	Not needed	Uses your existing ducts
Temperature control	Each indoor unit set on its own	Usually one thermostat for the home, unless you add zoning
What you see indoors	An indoor unit on the wall or ceiling of each room	Only vents and a thermostat
Best for	Rooms or homes without ducts, additions, ADUs	Whole homes with ducts in fair shape

Some homes use both: a central heat pump for the main house and a mini-split for an addition. We’ll help you choose what fits your home.

What happens during a mini-split installation?

1. Free in-home estimate. We look at the rooms you want to heat and cool, where the indoor and outdoor units can go, and your electrical service.
2. A clear written quote. You get a written quote with the equipment, the number of indoor units and the work included.
3. Permits. We pull the permits and handle any required HERS testing (a third-party check of the new system) for you.
4. Installation. We mount the indoor and outdoor units, run the refrigerant lines, wiring and condensate drain, and keep the line set neat.
5. Testing and walkthrough. We run each unit in heating and cooling and show you how to use the remote or app.

How do I keep a mini-split running well?

Clean filters and regular service keep a mini-split working well. Each indoor unit has washable filters. Check them every 1 to 3 months and rinse them when they look dusty. Keep about 2 feet clear around the outdoor unit. A yearly professional cleaning takes care of the coils, drain lines and parts you can’t reach. See mini-split maintenance for what’s included.

Do you repair mini-splits?

Yes. Common signs a mini-split needs repair are weak heating or cooling, water dripping from an indoor unit, ice on the lines, new noises or a blinking error light. The diagnostic visit is $89, and it is waived when you approve the repair. Comfort Club members pay $49 and get 15% off repairs.

I highly recommend Upgrade Home Services. Victor is fair, knowledgable, affordable, and provides very professional customer support.

Dawn S., Google review

Who installs ductless mini-splits near me?

Upgrade Home Services is a family-owned company based at 743 Ames Ave in Milpitas, licensed by the California Contractors State License Board (CSLB #1066776) and serving homeowners since 2002. We are a Mitsubishi Electric Diamond Contractor, we also install Daikin, Carrier and Goodman, and we service every major brand. We serve 22 cities in Santa Clara, San Mateo and southern Alameda counties, including Milpitas, San Jose, Cupertino, Sunnyvale, Fremont and Palo Alto.