HVAC Services in Newcastle, WA
Newcastle sits on a hillside, and that single fact drives most of the HVAC work we do here. Homes stepped into a slope almost never condition evenly from one zone. The lower level runs cold while the top floor overheats, the thermostat is satisfied long before the bottom of the house catches up, and no amount of extra furnace capacity fixes it. What fixes it is zoning and distribution.
The other thing worth knowing here is that Newcastle is a young city, which changes where your home’s permit history actually lives. This page covers that, how permits work now, and which rebates apply. To talk it through, call (206) 900-9231.
What we do most in Newcastle
Each service has its own page with the detail on equipment, sizing and what the work involves.
Zoning and duct distribution
The Newcastle fix. Where a daylight level or a room over the garage never keeps up, the answer is returns, duct sizing and zoning rather than a larger system.
Also: Indoor air quality · Ventilation
Heat pump installation
Replaces the furnace and adds cooling on the same equipment. On a hillside home it is worth pairing with a zoning review, because a bigger single zone will repeat the problem you already have.
Also: Air to water heat pumps
Ductless and mini split systems
The straightforward answer for one stubborn room, a finished lower level or a bonus space the original ductwork never properly reached. One head per zone, no new duct runs.
Also: Mini split repair
Furnace repair and replacement
Repair, replacement and annual service on gas and electric furnaces. Newcastle names furnace replacement specifically as permitted work, so this is not a job to have done informally.
Also: All heating
Air conditioning
Repair and replacement, and new installations where a home was built without cooling. Air conditioner installation is also named in the city’s permitted work.
Also: AC replacement
Water heaters
Tank, tankless and heat pump water heaters. On a multi level home the run from heater to the furthest bathroom is often the real complaint, and that is a distribution question too.
Also: Heat pump water heaters · Tankless
Boilers and radiant heat
Hydronic systems handle multi level homes well, because each zone gets its own loop rather than competing for air from one blower. We service, repair and replace both.
Also: Radiant heat
Geothermal
Ground source heat pumps need lot area for the loop field, which rules out the steeper and tighter Newcastle lots but suits the larger properties toward the edges of the city.
Also: Heat pump options
Not listed? See every service we offer.
Newcastle is younger than most of its houses
Newcastle incorporated on 30 September 1994, originally as the City of Newport Hills, and took the name Newcastle on 23 December that year after a vote. Before then this was unincorporated King County.
A good deal of the housing here predates 1994, which means the original permit records for those homes are King County records rather than City of Newcastle ones. If you are trying to establish when a furnace was installed or whether an addition was permitted, and the City has nothing on file, that does not mean the work was unpermitted. It means you are searching the wrong archive.
Anything from late 1994 onward is a Newcastle record. It is a useful date to keep in mind when buying, and it is the first thing we check when a system’s age is unclear.
Permits for HVAC work in Newcastle
| Permit authority | City of Newcastle Building Division |
|---|---|
| What needs a permit | Newcastle names furnace replacement and air conditioner installation among the common projects that require a permit. Some exemptions apply, so it is worth confirming your specific job rather than assuming. |
| Inspections | The City states that “All inspection requests are to be made online through MyBuildingPermit”, the same regional portal used across the Eastside. Most permits require at least one inspection. |
| Permit expiry | Newcastle permits expire two years from the date they are issued, regardless of project status. That matters on a phased remodel more than on a single equipment swap, but it is worth knowing. |
| Older records | Anything permitted before the city incorporated in late 1994 sits with King County. See above. |
| Electrical work | A heat pump or ductless conversion normally needs an electrical permit as well as the mechanical one. We hold a Washington electrical contractor license, so both come from us rather than a second trade. |
| Utility | Puget Sound Energy supplies gas and electricity in Newcastle, which is what determines the rebates below. |
We pull the permits on our own work. If one quote is noticeably cheaper than the others, it is worth asking whether permitting is included, because an unpermitted install is the kind of thing that surfaces later during a sale.
Rebates in Newcastle
Newcastle is Puget Sound Energy territory. The headline $1,500 conversion rebate requires your existing primary heat to be electric resistance, so a gas furnace does not qualify for it. A separate electrification rebate worth up to $4,000 covers moderate income customers converting from gas to an all electric heat pump.
PSE only pays when the installing contractor is a Recommended Energy Professional or Trade Ally, and NW Mechanical holds PSE Recommended Energy Professional status, so the work we install qualifies.
Our heat pump rebates page sets out every program side by side, including the conditions that disqualify people most often.
Where we work in Newcastle
A small city, so we cover all of it. What changes is how the house sits on the ground.
Hillside and view homes
Stepped into the slope, often with a daylight level. The classic uneven heating complaint, and the one that zoning rather than capacity solves.
Coal Creek and the valley
A mix of ages, much of it predating incorporation, so permit history often sits with King County rather than the City.
Newer plats and larger lots
Existing ductwork and, frequently, an original builder air conditioner reaching the end of its life. Heat pump conversions are usually straightforward here.
We also cover the rest of the Eastside and Seattle. See Bellevue, Issaquah, Mercer Island, Sammamish and all service areas.
Newcastle HVAC questions we get asked
Why is my lower level always cold?
Because it is on the same zone as the rest of the house. The thermostat upstairs is satisfied long before the lower level warms up, so the system shuts off early. Zoning, returns and duct sizing fix it, and a larger furnace does not.
Do I need a permit to replace my furnace in Newcastle?
Yes. The City names furnace replacement among the projects requiring a permit, and inspections are booked through MyBuildingPermit. We handle both as part of the job.
The City has no permit record for my house. Is that a problem?
Usually not. Newcastle only incorporated in late 1994, so anything older is a King County record. Search there before assuming work was done without a permit.
Would a ductless system solve one cold room?
Often yes, and it is usually cheaper than reworking ductwork through finished ceilings. It is the standard answer for a converted garage, a bonus room or a daylight level.
Will a heat pump cope on a hillside in winter?
Yes. Elevation makes a marginal difference here and current cold climate heat pumps hold useful capacity well below anything Newcastle sees. Sizing and distribution matter far more than the outdoor temperature.
Talk to us about your Newcastle home. If the complaint is uneven heating, we will look at zoning, returns and duct capacity before recommending equipment, because that is usually where the problem actually is.
Call (206) 900-9231 or request an estimate.
Permit requirements, the inspection portal and the two year permit expiry from the City of Newcastle Building Division and Permit Center. Incorporation on 30 September 1994 as the City of Newport Hills and the renaming to Newcastle on 23 December 1994 from HistoryLink. Rebate amounts and conditions from Puget Sound Energy. Permit rules and rebate amounts change, so confirm current requirements with the City and PSE before relying on them. Last reviewed September 2026.
Licensed, Bonded and Insured in Newcastle
Each license can be looked up individually on the Washington State L&I contractor register.
Mechanical permits here are issued by the City of Newcastle, and we pull them for the work we do. Natural gas and electricity are supplied by Puget Sound Energy.
If you ever smell gas, leave the building first and call Puget Sound Energy on 1-888-225-5773 before you call us.
