Boulder City Ductless Mini Splits
Plenty of Boulder City houses went up before anybody planned on ductwork, and a lot of the rooms added since were never tied into the central system. The casita out back, the garage that turned into an office, the sunroom that bakes in summer and goes cold in winter. A ductless mini split heats and cools one space at a time with no duct run to cut in. We size each head to its room and commission it with the same instruments we bring to every job.
Cottages Built Long Before Anyone Planned on Ducts
Boulder City began in 1931 as a federal town for the workers building Hoover Dam, and some of those first cottages and bungalows still stand in the historic downtown. They were built small and solid, with no thought of forced air. Some have picked up a window unit or a swamp cooler over the decades. What they rarely have is the attic depth or the chase space for a full duct system, and cutting one in means tearing into finished ceilings and walls the owners would rather leave alone.
A ductless system steps around that whole problem. The indoor head mounts high on a wall, the outdoor unit sits on a pad outside, and the only thing connecting them is a small bundle: two refrigerant lines, a power and control cable, and a condensate drain. That bundle passes through a hole a few inches across in the exterior wall. Nobody has to crawl the attic, and nobody has to patch a ceiling afterward.
The same logic fits the ranch homes from the 1950s through the 1980s that make up so much of the town. Their original system was sized for the original footprint. Then a family enclosed the patio, finished the garage, or built a casita for a parent, and the central unit got asked to cover rooms it was never designed to reach. Running a new branch duct out to an add-on usually steals air from rooms that were already on that trunk. A head dedicated to the new space leaves the existing system to do the job it was built for.
One Head or Several: Single-Zone Against Multi-Zone
A single-zone system pairs one outdoor unit with one indoor head. It is the simplest answer for a single room, and because each zone has its own equipment, a failure in the casita never touches the main bedroom. A multi-zone system runs two or more heads off one outdoor unit, which saves wall space outside and works well when the rooms sit close together.
Neither one wins on paper. The choice depends on how the rooms get used. A multi-zone outdoor unit is sized for the combined load of every head on it. When one small head is the only one calling on a mild evening, the inverter compressor throttles down to match, and that works fine within its range. Pair a tiny bedroom head with a big living room head on the same unit, though, and the small room can short cycle because the compressor cannot turn down far enough. We ask when each room is actually occupied before we recommend sharing a compressor.
Line set routing matters too. Every head on a multi-zone system needs its own pair of copper lines back to the outdoor unit, and long runs wrapped around the outside of a house add refrigerant, add joints, and add places for a leak to start. On a cottage with rooms at opposite ends, two single-zone systems are sometimes cleaner work than one multi-zone unit with copper strung along three walls.
Whichever way it goes, the quote comes in writing. It lists the equipment, where every head and line set lands, and what electrical work the install needs, including any question about panel capacity, so nothing surprises you halfway through the job.
Placing the Outdoor Unit and Line Set on a Stucco House
On a stucco house the outdoor unit usually lands on a level pad near the wall closest to the indoor head, in a spot that keeps the line run short and still leaves room to service it. We look for clearance on the sides the coil breathes through, a path for condensate that does not streak the wall or pool against the foundation, and a location that keeps fan noise away from a bedroom window or a neighbor’s patio.
The penetration through stucco gets done properly. We core a clean hole, sleeve it, and seal around the bundle so water and dust stay outside and the stucco around it does not crack later. Lines running up or across the wall go inside a cover that can be painted to match the house. That looks far better than bare insulated copper, and it also shields the line insulation from sun that breaks it down. Cracked insulation on the suction line costs efficiency every day the system runs.
Gravel and rock around the pad drain well and keep dirt from splashing up into the coil. We still keep the unit itself on a level pad or a wall bracket, because a condenser that settles out of level drains poorly and puts stress on its own line set over time.
Got a room the central system never reached?
Tell us about the space and how you use it, and we will come measure it. You can also send us the details and we will call you back.
Heat Pump Heat for the Cold Nights at 2,500 Feet
Boulder City sits around 2,500 feet, higher than the Las Vegas Valley floor, and its winters bring real heating nights. Every mini split we install is a heat pump. The outdoor unit that pulls heat out of the room in August pushes heat into it in January by reversing the refrigerant flow, and the inverter compressor ramps up and down smoothly instead of slamming on and off.
For a converted garage or a sunroom with a lot of glass, the heating side often matters as much as the cooling. Those spaces lose heat fast, and we see space heaters doing that job more often than we would like. Rated heating output drops as the outdoor air gets colder, so we check the manufacturer’s numbers at low outdoor temperatures before picking a head. A unit that is marginal in a mild December will feel weak on the coldest mornings.
Sizing happens room by room. We look at square footage, ceiling height, which way the windows face, how much glass there is, what sits above the ceiling, and how many people use the space. A west-facing sunroom and an interior bedroom of the same size can need very different capacity. Oversizing is the usual mistake, and it hurts more than people expect: the head hits the setpoint fast, idles at its lowest output, and runs in short bursts that never settle the room. After the install we verify the charge against the specification for the actual line length and read the supply air coming off the head.
The head pictured at the top of this page is a Daikin inverter unit, the kind of equipment we put in. Qualifying installs can go through Synchrony financing. For more on the equipment itself, see our valley-wide ductless mini split service. If the room in question is already on a duct system and simply never matches the others, Boulder City air balancing may fix it without new equipment, and duct leakage testing shows whether the existing ducts are losing air into the attic before you add anything.
Mini Split Questions From Boulder City Homeowners
Can a mini split really heat a room through a Boulder City winter?
Yes. Every system we install is a heat pump, and inverter equipment keeps producing heat through cold nights as long as it is sized for the room. We check the rated heating output at low outdoor temperatures before choosing a head, because that capacity falls as the weather gets colder.
Do I need ductwork or attic space for a ductless system?
No. The indoor head mounts on a wall and connects to the outdoor unit through one small hole carrying the refrigerant lines, the control cable and the drain. That is why ductless equipment suits dam-era cottages, casitas and converted garages, where adding ducts would mean opening finished ceilings.
Should I get one multi-zone system or separate single-zone units?
It depends on where the rooms are and how you use them. Multi-zone saves space outside and works well for rooms close together. Separate units make sense when rooms sit far apart, carry very different loads, or need to keep running if the other system goes down.
Why not just extend the existing ducts into the new room?
Sometimes that works. More often the central unit was sized for the original house, and a new branch pulls air away from rooms already on that trunk. We measure what the existing system delivers before recommending an extension, and a dedicated head usually turns out to be the cleaner answer.
Where will the outdoor unit go on my house?
Usually on a level pad close to the wall the indoor head hangs on, so the line run stays short. We plan clearance around the coil, a drain path that keeps water off the stucco and the foundation, and a spot where fan noise stays away from bedroom windows.
How do I know the system was installed right?
We commission it with readings. That means verifying the refrigerant charge against the specification for the actual line length, checking supply air temperature off each head, and confirming the drain carries water away. Those numbers go into your paperwork, so there is a baseline for any future service.
The Rest of Our Boulder City Work
A mini split answers one kind of comfort problem. If yours looks different, the same crew handles the rest of the heating and cooling work in town.
All Boulder City HVAC services · See our work · Request a written quote
Mini Split Installs Across Boulder City
We run out from the valley on US 93 and I-11 and work across town, from the dam-era cottages downtown to the newer homes at the edges. Boulder City runs its own building department, so any permit an install needs comes from the city itself.