Ductless Mini Split Installation in Walnut Creek and the Bay Area
Ductless mini splits are the cleanest way to heat and cool spaces where running ducts isn’t practical: ADUs, garages, additions, or older Bay Area homes that never had central air.
We mount the indoor heads, set the outdoor unit, run the line set through a single small penetration, and commission every zone so it performs the way the spec sheet promised.
Every mini split installation includes: Zone-by-zone sizing for the rooms you actually use; Indoor head mounting and outdoor unit placement; Line set, electrical, and condensate routing; Vacuum, pressure test, and refrigerant charge by the book; Remote / app control setup; Free estimate before any work begins.
Book with OTTER HVAC at (650) 900-0440. Flat $69 diagnostic on repairs. Free in-home estimates on new installations. EPA 608, OSHA, and NATE certified technicians.
Serving Concord, Walnut Creek, Pleasant Hill, San Ramon, Danville, Oakland, Berkeley, San Francisco, and nearby East Bay cities. Hours: 7:00am–5:00pm, seven days a week.
Related: All services · Pricing · Contact · heat pump installation
Frequently asked questions
Is a mini split enough to heat a room in winter?
Modern heat-pump mini splits heat efficiently in Bay Area winters. We’ll size the unit to the room so it keeps up on the coldest nights, not just the average ones.
How many indoor units do I need?
One per zone you want to control independently. A single outdoor unit can often serve several indoor heads — we’ll map it to how you use your space during the free estimate.
How disruptive is the installation?
Much less than adding ductwork. A typical single-zone install takes about a day and needs only a small penetration in the wall.
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References and credentials
- U.S. DOE Energy Saver
- EPA Section 608
- EPA Section 608 refrigerant certification
- U.S. Department of Energy — Energy Saver
Authority sources: U.S. DOE Energy Saver · EPA Section 608