Formerly Adam & Sam Brothers RepairMill Creek · Mini-split installs and service
Most Mill Creek homes have a gas furnace and ducts that work fine downstairs. The trouble is the second floor in July. A ductless head fixes that room without touching the furnace, and we service the mini-splits already running here.
Mill Creek was planned from the start. The first homes went up in 1975 and 1976 around a private golf course, the original plat was laid out as 21 subdivisions named after trees, and the city incorporated in 1983. Nearly half of today's homes were built between 1980 and 1999 and another 38% since 2000, so this is a city of two-story houses with gas furnaces, ducts in the attic or between floors, and one thermostat in the hallway downstairs. That arrangement leaves the upstairs bedrooms and the bonus room over the garage several degrees warmer than the main floor in summer, and sometimes cooler in winter, no matter how the registers are set.
On June 28, 2021, the Everett Herald listed Mill Creek at 107°F, an unofficial reading taken that afternoon. Upstairs bedrooms that are merely warm in a normal July were close to unusable that week. A single-zone mini-split in the worst room, or a small multi-zone system for the second floor, adds cooling where it is needed and leaves the furnace alone. We install those systems across Mill Creek, Mill Creek East, Silver Firs and Martha Lake, and we repair, clean and troubleshoot the ductless units already installed. Our van reaches Town Center in about 15–19 minutes by I-5 and SR 527, and if you reach us in the morning, Monday through Saturday, the visit is normally that same day.
Because Mill Creek was master-planned, many neighborhoods have homeowner associations with design rules for anything mounted on the outside of a house. Outdoor units, line-set covers and their colors are common topics for an architectural review. We give you a simple plan to submit, with the unit's location, its size, the route of the line set and the cover color matched to the siding. If the committee needs time, we hold the install date until the approval comes through. Placing the outdoor unit on the side or back of the house, out of view from the street and the golf course, usually satisfies a committee and keeps it away from neighbors' windows.
For a two-story house, the hard part of the job is the route from the head to the outdoor unit. Heads in upstairs bedrooms usually go on an exterior wall so the line can run down the siding inside a cover, or through the attic and down a corner. Bonus rooms over a garage often let us run the line through the garage, out of sight entirely. Attic routes need care, so we seal every penetration through the ceiling and the wall to keep attic air out of the bedroom. We keep line sets as short and direct as the house allows, because short runs are quieter and leave fewer joints that could leak.
The townhomes and apartments at East Gateway and The Farm add a different case: narrow side yards, shared walls and association-owned exteriors. Townhome outdoor units often share a narrow strip of ground with the neighbor's unit, so we check that the two are not blowing into each other. Mill Creek East and Silver Firs, meanwhile, are mostly newer detached homes with gas heat, where the mini-split question is the same as in town. All of these areas buy power from Snohomish County PUD, and we look at its current heat pump offers for each project. Whatever the building, the charge and the vacuum are our own technicians' job, done under EPA Section 608 rules.
Cooling one upstairs room with a single-zone system starts at $4,000, and that covers the equipment as well as the install. Bedrooms down the hall can join later, with each added zone starting at $2,250, which is how most second-floor layouts grow from one room to three. A complete multi-zone system is quoted on request after we measure the rooms, and the visit and written quote come at no cost. For an existing unit, mini-split repair and cleaning start at $285, whether the call turns out to be a fan motor, a drain, a board or a leak. These are area starting prices rather than a quote for your house. For a repair, the diagnostic is what sets the number on your written estimate; a new system's number arrives after the walk-through.
Starting prices for the north Seattle area, 2026. The $85 diagnostic is included in any repair you approve, and the exact price is in the written estimate before work starts.
Install prices start here, equipment and installation included, before any utility program. Multi-zone systems are priced after a visit. We do not charge for the site visit or the written quote.
Most mini-splits in Mill Creek are fairly young, because the houses they serve are young too. For those, repair is almost always right: a fan motor, a sensor, a drain pump or a board on a unit under ten years old. Replacement becomes the better choice when a compressor fails or the outdoor coil leaks on an older system, or when the original unit was clearly undersized for a west-facing bonus room. Some owners find that the real problem is coverage, not failure. If one head cools the bonus room but the bedrooms down the hall still overheat, adding a zone or moving to a multi-zone system solves more than a repair would. We write those options as separate lines so you can compare them.
Many Mill Creek neighborhoods have associations that review exterior equipment, so check your covenants before you schedule an install. We provide a written plan with the outdoor unit's location and size, the line-set route and the cover color, which is usually what a committee asks for. Placing the unit on the side or back of the house helps.
Yes. The furnace keeps heating the house through the ducts, and the mini-split cools, and can also heat, the rooms you choose. Each has its own controls, and neither gets in the other's way. Many owners use the head for the upstairs in summer and let the furnace handle winter, or use both on the coldest days.
On many Gree-built units, including several sold under other names, H6 means the board is not getting feedback from the indoor fan motor. Sometimes the blower wheel is stuck with debris; often the motor is failing. Cycle the power at the breaker, give it a minute, and restart. If H6 returns, call us with the code and the model number.
It depends on how the rooms are used. Many Mill Creek owners start with one head in the hottest room, often the bonus room, and add bedrooms later. Others want every upstairs room covered from the start. We measure each room and recommend a layout, and multi-zone systems are quoted on request after the visit.
Heat rises, the attic sits right above the bedrooms, and one thermostat downstairs cannot see the second floor. Ducts sized for winter heating often deliver too little cool air upstairs. A mini-split head gives that floor its own thermostat and its own cooling, which is why upstairs rooms are the most common place we install them here.
Talk to Adam & Sam
Hot bonus room or a head showing a code? Call (425) 570-9520 or book online, and the repair costs up to $18 less. The $85 diagnostic is included when you approve the repair, and measuring the upstairs for a new system costs you nothing.
Mini-split
No ducts, room-by-room control, heating and cooling from one wall unit: why mini-splits suit North Seattle metro homes and what a clean install looks like.
Schedule a repair
Send the basics and we call you back with an arrival window, most days the same morning.