# Mini Split Installation in Cornelius, OR

> Mini split installation in Cornelius, Oregon: manufactured homes and electric-heat houses on PGE, Energy Trust incentives, and permits through Forest Grove.

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

Service area, Oregon

Mini split installation in Cornelius, Oregon: manufactured homes and electric-heat houses on PGE, Energy Trust incentives, and permits through Forest Grove.

(971) 458-4515

Last Updated: November 12, 2026

10.7%

of Cornelius homes are manufactured or mobile homes (U.S. Census Bureau, ACS 5-year)

44.8%

of Cornelius homes heat with electricity (ACS 5-year)

Permits

City of Forest Grove Building Division for Cornelius (mechanical); Washington County (electrical)

Electric utility

PGE

## Rooms that need help in Cornelius

### A manufactured home on an electric furnace

About one in ten Cornelius homes is manufactured. One with an electric furnace pushes heat through ducts in the belly.

### Which utility is on your bill?

Cornelius is PGE, which Energy Trust serves. Next door, Forest Grove Light & Power customers are outside Energy Trust.

### Permits from Forest Grove

Cornelius contracts its building services from Forest Grove. Washington County handles the electrical permit.

## Start with the electric bill

Look at the name at the top of your electric bill first. Around Cornelius, it decides which incentives you can get before we talk about equipment.

Inside Cornelius city limits, the state’s utility map shows PGE. Forest Grove Light & Power, the City of Forest Grove’s own utility, starts at the line with Forest Grove and also serves rural areas around it. [Firlands Portland Mini Splits](https://firlandsportlandminisplits.com/) installs mini splits on both, but the incentives differ, so it’s the first thing we ask.

### Why the utility matters

Energy Trust of Oregon’s incentives come from PGE and Pacific Power customers’ bills, and they go back to those customers. Forest Grove Light & Power customers are outside Energy Trust, so its ductless incentive doesn’t apply there.

Project

## Inside a Cornelius manufactured home conversion

### The problem

The original electric furnace pushes heat through ducts in the belly of the home, and the bill doubles every winter. The ducts are tired, and the bedroom at the far end of the home never gets warm.

### The house

The home sits on piers with vinyl skirting, so there is no crawlspace to work in. The walls are thin, the panel is in the hall, and the lot is flat with room beside the home for a pad.

### What we decide, and why

Two heads: 12,000 BTU in the living and kitchen area and 9,000 BTU in the primary bedroom. The furnace stays as backup. The outdoor unit sits on its own pad beside the home, not attached to it, so its vibration doesn't carry into the floor.

### The work

Each head mounts on blocking we add behind the wall panel, since manufactured home walls won't hold a head on the paneling alone. Line sets go straight out the walls and down covers to the pad, then along the skirting line. The circuit runs from the hall panel through the belly in conduit. Nitrogen test, vacuum below 500 microns, drains to daylight beside the skirting.

We seal the belly wrap where the circuit passes through, so the insulation under the floor stays dry and rodents stay out.

### What it changes

The living area and primary bedroom come off the electric furnace, and the home qualifies for Energy Trust's ductless offer for manufactured homes.

Location

Cornelius, north of Baseline Street

House

1994 double-wide manufactured home, about 1,500 square feet, electric furnace

Equipment

Two heads (12,000 and 9,000 BTU) on one 18,000 BTU cold-climate outdoor unit

Price

$9,800, permits included

Time on site

2 days, then the final inspections

## Manufactured homes: what’s different

About one Cornelius home in ten is manufactured, and a mini split on one needs a few details a site-built house doesn’t.

- **Blocking behind each head.** Manufactured home walls are thin, and the paneling won’t hold a head on its own. We add framing behind it.
- **A pad set apart from the home.** The outdoor unit sits on its own pad beside the home, not bolted to the wall, so vibration doesn’t travel into the floor.
- **The belly stays sealed.** Where the circuit runs under the floor, we reseal the belly wrap so the insulation stays dry and animals stay out.
- **The furnace as backup.** The original electric furnace stays wired, set below the heads, for the coldest nights.
- **Skirting and access.** Line sets come down the wall and run along the skirting line to the pad, out of the way of skirting panels you may need to remove.

### Incentives for manufactured homes

On PGE, Energy Trust of Oregon pays $800 for a manufactured home when the ductless system replaces electric resistance heat in the main living space. Its manufactured home promotion pays more for qualifying equipment installed by a participating contractor. We check which applies to your home.

## How many heads a manufactured home needs

Count the rooms you live in, not the square footage, and size each head from that room’s heat loss.

| Home | Usual layout | Why |
| --- | --- | --- |
| Single-wide | One or two heads | A head at one end can’t push air past a long, narrow hall |
| Double-wide | Two heads, sometimes three | Living area and primary bedroom first, far bedrooms later |
| With an addition or porch room | A head of its own | The furnace ducts rarely reach it |

An older manufactured home can lose heat fast through thin walls and single-pane windows, so we size from what we measure, not a rule of thumb. [How many mini splits do I need?](https://firlandsportlandminisplits.com/guide/how-many-mini-splits-do-i-need/) explains the count.

## Permits: Forest Grove and Washington County

Cornelius contracts its building services from the City of Forest Grove, so a mini split here takes a permit from Forest Grove and one from Washington County.

| Permit | Who issues and inspects it |
| --- | --- |
| Mechanical (heat pump, line set) | City of Forest Grove Building Division, for Cornelius |
| Electrical (new circuit, disconnect) | Washington County Building Services |

The City of Cornelius says so on its building page. We file both, schedule the inspections and close the job out with both finals. The fees are in your price. [Mini split rebates in Oregon](https://firlandsportlandminisplits.com/guide/mini-split-rebates-oregon/) covers the incentive paperwork that goes alongside.

## Frost on the outdoor unit

Out at the west end of the valley, clear winter nights leave frost on everything by morning, the outdoor unit included.

The nearest long-term weather station, at Hillsboro’s airport a few miles east, records freezing temperatures on more than 60 nights in an average year and dipped to 13°F in recent winters. Here is what we do about it in Cornelius:

| Condition | What we do |
| --- | --- |
| Frost most winter mornings | Choose a cold-climate model that keeps its output in the teens |
| Defrost cycles shedding water | Set the unit on a short stand over gravel, clear of paths |
| A manufactured home’s skirting | Keep the pad a foot or more from it, so ice and water stay off the skirting |
| Washington County’s 27°F design low | Size the heating to carry it, with the furnace as backup below that |

[Do mini splits work in cold weather?](https://firlandsportlandminisplits.com/guide/do-mini-splits-work-in-cold-weather/) explains how defrost works.

## Electric-heat houses beyond manufactured homes

Nearly half of Cornelius homes heat with electricity, and in site-built houses that means baseboards, wall heaters or an electric furnace.

### Baseboards and wall heaters

A [baseboard to mini split conversion](https://firlandsportlandminisplits.com/baseboard-heat-to-mini-split/) puts heads in the living room and primary bedroom, and leaves small rooms on their baseboards as backup.

### Electric furnaces

Where the ducts are sound, a ducted heat pump can be the better swap; where they aren’t, ductless heads in the main rooms do better. [Mini split electric bill](https://firlandsportlandminisplits.com/guide/mini-split-electric-bill/) shows the running-cost difference.

## What it costs in Cornelius

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 run $9,000 to $18,000 and up. A manufactured home’s blocking and belly work are on the estimate from the start, not added later. For rental homes, [mini splits for rental property](https://firlandsportlandminisplits.com/guide/mini-split-for-rental-property/) covers the higher incentive available for rentals on PGE. [Mini split installation cost](https://firlandsportlandminisplits.com/guide/mini-split-installation-cost-portland/) has the full breakdown.

## Keeping it running

Outdoor units in farm country collect dust, pollen and leaves, so a yearly cleaning keeps the coil and the drains clear.

A [maintenance visit](https://firlandsportlandminisplits.com/mini-split-cleaning-maintenance/) typically runs $150 to $250 for one outdoor unit and one head, plus $40 to $120 for each additional head. It covers the filters, the coil, the drain and a check of the outdoor unit’s base pan, where debris and defrost water collect.

## Around Cornelius

Cornelius runs along the Tualatin Valley Highway couplet, with neighborhoods north and south of it and farmland beyond.

- **North and south of Baseline and Adair.** Older site-built houses, some with baseboards or wall heaters.
- **Manufactured homes.** Wherever they sit in town, the blocking, pad and belly details above apply.
- **Newer subdivisions on the edges.** Houses from the 1990s on, where a [single-zone head](https://firlandsportlandminisplits.com/single-zone-mini-split-installation/) handles one hot room or a [multi-zone system](https://firlandsportlandminisplits.com/multi-zone-mini-split-installation/) covers the upstairs.

## Services in Cornelius

- [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**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**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/)
- [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**Cleaning and maintenance** Mini split cleaning in Portland: deep cleans for musty or weak heads, and a yearly visit that keeps filters, coils and drains clear.](https://firlandsportlandminisplits.com/mini-split-cleaning-maintenance/)

## How a job usually runs in Cornelius

### 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

- Downtown Cornelius
- North Cornelius
- South Cornelius
- Council Creek area
- Baseline and Adair corridor
- East Cornelius near Hillsboro

### Landmarks

- Cornelius Public Library
- Council Creek
- Harleman Park
- Free Orchards Park
- Tualatin Valley Highway

### Getting around

- Tualatin Valley Highway (Baseline and Adair streets) east-west
- N 10th Avenue
- N 4th Avenue
- Council Creek Trail corridor
- Highway 47 to the west

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

## Cornelius: questions

### How much is a mini split for a Cornelius home?

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

### Can a mini split go on a manufactured home in Cornelius?

Yes. Each head mounts on blocking added behind the wall panel, the line sets run straight out through the wall, and the outdoor unit sits on its own pad beside the home rather than hanging from it. The belly wrap is resealed wherever the circuit passes through.

### Who issues mini split permits in Cornelius?

The City of Forest Grove's Building Division issues the mechanical permit for Cornelius, under contract to the city. Washington County Building Services handles all electrical permits and inspections. We file both and book the inspections.

### Does Energy Trust cover a mini split if I'm on Forest Grove Light & Power in Cornelius?

No. Energy Trust of Oregon's incentives go to PGE and Pacific Power customers, and Forest Grove Light & Power customers are outside them. Cornelius itself is on PGE; for a rural address nearby, check the name on your electric bill.

### Will a mini split heat a Cornelius house on a frosty morning?

A cold-climate unit sized to the house keeps heating below Washington County's 27°F design low. Hillsboro's airport, just east, averages about 64 freezing nights a year and reached 13°F in recent winters, so we pick units by their published low-temperature output.

## Nearby service areas

- [Oregon**Hillsboro** Mini split installation in Hillsboro, Oregon: outdoor units set for frosty west-side mornings, bonus rooms in newer houses, and City of Hillsboro permits.](https://firlandsportlandminisplits.com/service-areas/hillsboro/)
- [Oregon**Aloha** Mini split installation in Aloha: 1970s split-levels and ranches, a head on each level, Washington County permits and Energy Trust incentives. Typical ranges.](https://firlandsportlandminisplits.com/service-areas/aloha/)
- [Oregon**Oak Hills** Mini split installation in Oak Hills: cooling post-and-beam houses with radiant floors and no attic, lines kept off exposed beams, Washington County permits.](https://firlandsportlandminisplits.com/service-areas/oak-hills/)

## Guides for houses in Cornelius

- [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**Do mini splits work in cold weather?** Portland's winters are mild with sharp exceptions: freezing rain, an east wind and a few nights in the teens.](https://firlandsportlandminisplits.com/guide/do-mini-splits-work-in-cold-weather/)
- [Decision Guide**Is a mini split a good choice for a rental property?** What Oregon law asks of rental cooling, what Energy Trust pays, and how to lay out heads in a house or a fourplex.](https://firlandsportlandminisplits.com/guide/mini-split-for-rental-property/)
- [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/)

## Get an estimate in Cornelius

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

(971) 458-4515