# Mini Split Installation in Tualatin, OR

> Mini split installation in Tualatin: electric furnace and baseboard houses, ductless versus ducted heat pumps, and the city and county permit split explained.

URL: https://firlandsportlandminisplits.com/service-areas/tualatin/

Service area, Oregon

Mini split installation in Tualatin: electric furnace and baseboard houses, ductless versus ducted heat pumps, and the city and county permit split explained.

(971) 458-4515

Last Updated: November 12, 2026

48.8%

of Tualatin homes heat with electricity (U.S. Census Bureau, ACS 5-year)

49.3%

of Tualatin homes were built in the 1980s and 1990s (ACS 5-year)

Permits

City of Tualatin (mechanical); Washington County (electrical)

Electric utility

PGE

## Rooms that need help in Tualatin

### An electric furnace and big bills

Nearly half of Tualatin homes heat with electricity. In a house with ducts, that may be an electric furnace, the costliest way to heat through them.

### Two counties, one city

Tualatin sits in both Washington and Clackamas counties. The city issues the mechanical permit either way; Washington County does the electrical.

### Hot upstairs, window units

Where the ducts can't keep a two-story house cool upstairs, window units end up in the bedrooms every summer.

## When the electric furnace is the problem

An electric furnace or baseboards is the costliest way to heat a Tualatin house, and a heat pump is where the savings are. The real question is whether it goes on the ducts or in the rooms.

Nearly half of Tualatin’s homes heat with electricity. [Firlands Portland Mini Splits](https://firlandsportlandminisplits.com/) installs ductless and concealed ducted mini splits across the city, and in an electric-furnace house we start by looking hard at the ducts. They decide which kind of heat pump makes sense.

### Why an electric furnace costs so much

An electric furnace is a big set of resistance coils with a fan. It turns each kilowatt-hour into one kilowatt-hour of heat. A heat pump moves heat in from outdoors and, on a typical Tualatin winter day, delivers several times as much heat for the same electricity. [Mini split electric bill](https://firlandsportlandminisplits.com/guide/mini-split-electric-bill/) shows the arithmetic.

Project

## A typical Tualatin electric-furnace house, three heads

### The problem

The electric furnace heats the house through ducts, and the winter bills run well over what neighbors with gas pay. Summer means two window units upstairs.

### The house

The ducts run through the crawlspace and a single upstairs chase, and the upstairs returns are small. The panel in the garage has the room for one new 240-volt circuit once we account for the furnace.

### What we decide, and why

We compare two paths: a ducted heat pump on the existing ducts, or ductless heads in the rooms that are used most. The upstairs ducts are undersized for cooling, so we choose three heads: the open living and kitchen space, the primary bedroom and the upstairs office. The furnace stays wired as backup for the coldest nights and the rooms without heads.

### The work

Two upstairs line sets run through the attic and down a cover on the side wall; the living room head goes straight out the wall behind it. The outdoor unit sits on a stand at the side of the house with a 30-amp circuit from the garage panel. Nitrogen test, vacuum below 500 microns, three drains tested with water. The furnace thermostat is set below the heads so it only runs when they can't keep up.

Setting the furnace to back up rather than compete is the step that makes the bill drop; left at the same setpoint, the furnace runs alongside the heads all winter.

### What it changes

The heads carry most of the heating and all of the cooling, the window units go, and the furnace becomes the backup it should be.

Location

Tualatin, west of Boones Ferry Road

House

1986 two-story, about 1,900 square feet, electric forced-air furnace

Equipment

Three heads (15,000, 9,000 and 9,000 BTU) on one 24,000 BTU cold-climate outdoor unit

Price

$13,250, permits included

Time on site

3 days, then the final inspections

## Ducted or ductless in an electric-furnace house

Good ducts favor a ducted heat pump; weak or undersized ducts favor ductless heads in the rooms you use.

| What we find | What usually fits |
| --- | --- |
| Ducts sealed, sized well, reaching every room | A central or [concealed ducted](https://firlandsportlandminisplits.com/ducted-mini-split-installation/) heat pump on the existing ducts |
| Undersized upstairs runs, small returns | Ductless heads in the main rooms, furnace kept as backup |
| Ducts in a damp crawlspace, leaking | Ductless, rather than paying to heat the crawlspace |
| Only a few rooms in daily use | Two or three heads, the rest left on the furnace |

[Mini split vs central heat pump](https://firlandsportlandminisplits.com/guide/mini-split-vs-central-heat-pump/) compares the two in more depth. Either way, you get one written estimate that says which path we recommend and why.

## How we check the ducts

Before we recommend ducted or ductless, we look at the ducts themselves, because their condition decides which heat pump will actually work.

- **Where they run.** Crawlspace, attic, or inside the house. Ducts outside the heated space lose heat to it.
- **How tight they are.** We look for disconnected joints and torn wrap, which leak heated air into the crawlspace.
- **How big the upstairs runs are.** A heat pump moves cooler air in winter than a furnace does, so undersized runs feel drafty and weak.
- **The returns.** A bedroom with no return air path won’t cool, whatever the equipment.

You get our findings on the written estimate along with the recommendation.

## Setting the furnace up as backup

When ductless heads take over the main rooms, the electric furnace stays, but it has to be set up so it doesn’t run alongside them.

We set its thermostat a few degrees below the heads’ setpoint. On a normal winter day the heads carry the house and the furnace never starts. On the coldest nights, or for rooms without a head, it fills in. Left at the same setting as the heads, it would share the load all winter and the bill would barely change.

## Two counties, two permit offices

Tualatin straddles the Washington and Clackamas county line, but the permit split is the same on both sides: the city does mechanical, Washington County does electrical.

| Permit | Who issues and inspects it |
| --- | --- |
| Mechanical (heat pump, line set) | City of Tualatin Building Division |
| Electrical (new circuit, disconnect) | Washington County, under contract to the city |

The city says plainly that all electrical permits and plan review for Tualatin are contracted to Washington County. That means two applications and two sets of inspections for one install. We file both, schedule both, and close the job out with both finals; the fees are in your price. [Mini split permits](https://firlandsportlandminisplits.com/guide/mini-split-permit-portland/) explains what each inspector checks.

## The panel and the circuit

A heat pump needs its own 240-volt circuit, and in an electric-furnace house we check that the panel can carry it alongside the furnace.

The electric furnace already draws a large share of the panel’s capacity. Because the heads take over most of the heating, the two rarely run hard at the same moment, but we work the numbers rather than assume.

### When the panel is full

If the panel can’t take the new circuit, a service upgrade typically runs $2,500 to $6,000, and we say so before you commit. [Mini split electrical requirements](https://firlandsportlandminisplits.com/guide/mini-split-electrical-requirements/) covers circuit sizing and the disconnect.

## What it costs in Tualatin

Firlands’ typical range for one head is $4,000 to $8,500, and two heads on one outdoor unit run $6,500 to $12,000.

Three or four heads, for an electric-furnace house where the main rooms come off the furnace, run $9,000 to $18,000 and up. A concealed ducted system typically runs $8,500 to $16,000 and up, depending on the duct runs. [Mini split installation cost](https://firlandsportlandminisplits.com/guide/mini-split-installation-cost-portland/) shows what moves the price.

### Incentives on PGE

Tualatin is PGE territory, so Energy Trust of Oregon’s incentives apply.

Its ductless offer pays $800 for a detached home and $1,800 for attached, rental or income-qualified homes when the system replaces electric resistance heat in the main living space. A ducted heat pump replacing an electric forced-air furnace has its own offer. [Mini split rebates in Oregon](https://firlandsportlandminisplits.com/guide/mini-split-rebates-oregon/) lists the conditions.

## Baseboards and condos

Not every electric-heated Tualatin home has ducts. Baseboard houses and condos have their own path.

- **Baseboard houses.** A [baseboard to mini split conversion](https://firlandsportlandminisplits.com/baseboard-heat-to-mini-split/) puts heads in the main rooms and leaves baseboards in small ones.
- **Condos and apartments.** Tualatin has a good share of multi-unit buildings. The building’s rules decide where an outdoor unit can go, and an upper-floor unit may need a wall bracket.
- **Manufactured homes.** A small share of Tualatin’s housing. They need blocking behind each head and a pad set apart from the home.

## Around Tualatin

Tualatin’s houses mostly date from the 1970s through the 1990s, with some newer streets and a good share of townhouses and apartments.

- **1970s and 1980s houses.** Where one has an electric furnace or baseboards, the ducted-or-ductless decision comes first.
- **1990s and 2000s houses.** Where one has gas heat and central air, a [single-zone head](https://firlandsportlandminisplits.com/single-zone-mini-split-installation/) handles the one hot room.
- **Near the Tualatin River.** Lower ground, where we keep the outdoor unit on a stand well clear of standing water.

## Services in Tualatin

- [Service**Multi-zone installation** Multi zone mini split installation: two to five rooms on one outdoor unit, each head sized to its own room and set to its own temperature.](https://firlandsportlandminisplits.com/multi-zone-mini-split-installation/)
- [Service**Concealed ducted** Ducted mini split installation: a slim air handler hidden in the attic or knee wall, feeding two or three rooms through small grilles.](https://firlandsportlandminisplits.com/ducted-mini-split-installation/)
- [Service**Baseboard to mini split** Replace baseboard heat with a mini split: ductless heads take over in the rooms that use the most heat, and add cooling.](https://firlandsportlandminisplits.com/baseboard-heat-to-mini-split/)
- [Service**Whole-house systems** Whole house mini split installation: every room heated and cooled by ductless heads, planned as one system with a winter backup plan.](https://firlandsportlandminisplits.com/whole-house-mini-split/)
- [Service**Single-zone installation** Single zone mini split installation: one indoor head and one outdoor unit for the room the furnace never reaches, sized to that room.](https://firlandsportlandminisplits.com/single-zone-mini-split-installation/)

## How a job usually runs in Tualatin

### The call

You tell us the rooms and send a few photos; we give a rough range.

### The visit

We measure each room, look at the walls, the panel and where the outdoor unit can go.

### The estimate

A written estimate: each head, the line-set route, drains, circuit, permits and price.

### Install and handover

Pressure test, vacuum, startup, a walk-through, and the permits closed out.

## Neighborhoods, landmarks and routes

- Tualatin Commons area
- Ibach
- Bridgeport
- Martinazzi Woods
- Byrom
- East Tualatin
- Midwest
- Riverpark

### Landmarks

- Lake at the Commons
- Tualatin Community Park
- Browns Ferry Park
- Tualatin River
- Bridgeport Village

### Getting around

- Interstate 5 along the east edge
- Interstate 205 at the north edge
- Tualatin-Sherwood Road
- Boones Ferry Road
- WES commuter rail at Tualatin station

[Open Tualatin, Oregon in Google Maps](https://www.google.com/maps/search/?api=1&query=Tualatin%2C%20Oregon)

## Tualatin: questions

### What is the typical price of a mini split in Tualatin?

Firlands' typical range for one head is $4,000 to $8,500, two heads on one outdoor unit $6,500 to $12,000, three or four heads $9,000 to $18,000 and up, and a concealed ducted system $8,500 to $16,000 and up. Permit fees are included; the written estimate sets your price.

### Who issues mini split permits in Tualatin?

Two offices. The City of Tualatin's Building Division issues the mechanical permit for the heat pump, and Washington County issues and inspects the electrical permit for the new circuit, on both the Washington and Clackamas county sides of the city. We file both.

### Should I replace my electric furnace with a mini split or a ducted heat pump in Tualatin?

If the ducts are in good shape and reach every room well, a ducted heat pump on them is often the simpler swap. If the upstairs ducts are undersized or you only use a few rooms, ductless heads do better. We check the ducts on the visit.

### Can I keep my electric furnace as backup after a Tualatin mini split install?

Yes. We set its thermostat a few degrees below the heads so it only runs on the coldest nights or in rooms without a head. Left at the same setting, it competes with the heads and the bill barely moves.

### Which Energy Trust incentive fits a Tualatin electric-furnace house?

Tualatin is PGE territory. Energy Trust of Oregon has a ductless offer for replacing electric resistance heat in the main living space, and a separate ducted heat pump offer for replacing an electric forced-air furnace. We check which one your project meets.

## Nearby service areas

- [Oregon**Tigard** Mini split installation in Tigard: cooling for hot upstairs rooms in gas-heated houses, Bull Mountain slopes, City of Tigard permits and typical price ranges.](https://firlandsportlandminisplits.com/service-areas/tigard/)
- [Oregon**Sherwood** Mini split installation in Sherwood, Oregon: converted garages, bonus rooms and offices in 1990s and 2000s houses, with city and county permits.](https://firlandsportlandminisplits.com/service-areas/sherwood/)
- [Oregon**Lake Oswego** Mini split installation in Lake Oswego for 1970s and 1980s homes: bedroom wings, ducted units hidden in the attic, condos near the lake, and city permits.](https://firlandsportlandminisplits.com/service-areas/lake-oswego/)

## Guides for houses in Tualatin

- [Decision Guide**Mini split vs central heat pump: which fits a Portland house?** It comes down to your ducts: whether they exist, where they reach, and what shape they're in.](https://firlandsportlandminisplits.com/guide/mini-split-vs-central-heat-pump/)
- [Learn**How much will a mini split add to my electric bill?** Running costs worked out from PGE, Pacific Power and NW Natural rates, against baseboards and a gas furnace.](https://firlandsportlandminisplits.com/guide/mini-split-electric-bill/)
- [Learn**What mini split rebates are available in Oregon?** What Energy Trust pays, which homes qualify, how state and city programs work, and what's changed for the federal credit.](https://firlandsportlandminisplits.com/guide/mini-split-rebates-oregon/)
- [Learn**What are the electrical requirements for a mini split?** The circuit, the disconnect, the panel and the permit, and what changes in an older Portland house.](https://firlandsportlandminisplits.com/guide/mini-split-electrical-requirements/)

## Get an estimate in Tualatin

Tell us which rooms aren't working and where the house is in Tualatin.

(971) 458-4515