A rental is a spreadsheet with a roof on it. That is not cynicism — it is the right way to think about HVAC on a property you do not live in, because the decision is not "what feels nicest," it is "what does this cost, what does it prevent, and what does it do to the rent roll."
Auburn is one of the easier cities in our service area to answer that question for. It is straightforward Puget Sound Energy territory for both gas and electric, so rebate eligibility does not depend on which side of a street the property sits on. And Washington's energy code lists Auburn at a 25°F winter design temperature — the mildest in Varsity's entire 45-city service area. A correctly sized heat pump here almost never leans on backup heat, which matters a lot when the person paying the power bill is not the person who signed the equipment contract.
Here is the honest budget conversation.
The numbers to put in your pro forma
These are installed prices, labor and materials included, for standard Puget Sound markets — which Auburn is.
| Scope | Installed cost |
|---|---|
| ScopeDucted heat pump, existing ductwork reused | Installed cost$12,000 - $18,000 |
| ScopeDuctless mini-split system | Installed cost$8,000 - $14,000 |
| ScopeHeat pump replacement (old heat pump out, new one in) | Installed cost$10,000 - $16,000 |
| ScopeGas furnace replacement, heating only | Installed cost$4,000 - $8,000 |
| ScopeDuctwork replacement or major modification | Installed cost$3,000 - $8,000 |
| ScopeRepair (diagnosed, priced before work starts) | Installed cost$150 - $1,500 |
The spread inside each range is real, not padding. A 1,300 sq ft rambler with a clean duct system and a panel with room in it lands near the bottom. A 2,400 sq ft split-level with crushed flex duct in the crawlspace and a full panel lands near the top.
Ducted vs. ductless in a rental, specifically
Owner-occupants pick based on comfort preference. Landlords should pick based on what survives tenants.
- Ducted wins when there is usable ductwork. Nothing hangs on the wall. Nothing gets a coat rack screwed into it. The tenant interacts with one thermostat, and that is it. Fewer touchpoints means fewer service calls that you pay for.
- Ductless wins when there are no ducts. Retrofitting duct runs into a finished, occupied rental is invasive, slow and expensive — you are opening ceilings and soffits in a unit someone is living in. A mini-split needs a three-inch wall penetration per head and a line set. That is the whole story.
- Ductless also wins on multi-unit metering. In a duplex or fourplex, each unit gets its own outdoor condenser and its own circuit off its own meter. No arguing about who ran the heat.
Why Auburn is an easy rebate address
Rebates follow the meter, not the county line — and in a lot of our service area that is a genuine headache. Not in Auburn. Auburn is PSE for electricity and PSE for gas, full stop.
That means a qualifying heat pump conversion at an Auburn rental can be worth up to $4,400 when it replaces an existing electric or fossil-fuel system. The exact amount depends on what you are replacing and what you install — a straight electric-resistance conversion and an income-qualified gas conversion are different tiers of the same program. Programs change, so we confirm your current eligibility and handle the paperwork as part of the job.
Two things landlords need to know before they build a rebate into a budget:
- The federal 25C tax credit ended December 31, 2025. No 2026 installation qualifies. If a bid you are comparing still mentions it, that bid is out of date.
- From April 2, 2026, PSE rebates require a PSE-certified installer. If the installer is not certified, the rebate is forfeited — not delayed, forfeited. Varsity is a PSE Certified Contractor, which is exactly the kind of detail that separates a real number from a hopeful one. More on how the program works in our PSE heat pump rebate breakdown.
The four Auburn rental scenarios we price most
1. The 1970s-1990s rambler or split-level
The bread and butter of Auburn's rental stock. Gas furnace, existing ductwork, no AC. Replacing the furnace alone is $4,000 to $8,000 and buys you heating only. A ducted heat pump at $12,000 to $18,000 buys heating and cooling in one system, and unlike a furnace swap it can qualify for rebate money. If the furnace is 12+ years old, price both before you sign anything.
2. The electric-baseboard duplex or fourplex
This is the strongest money case in the entire post. Baseboard heat is electric resistance — the least efficient way to heat a building. Converting to a heat pump typically cuts heating costs 30 to 50 percent, and electric-resistance conversion is the classic PSE rebate scenario. If tenants pay their own power, you are handing them a lower bill without touching the rent, which is a real retention lever in a competitive market. If you pay the heat on a multi-unit, the savings land directly in your pocket.
3. The manufactured home
Different equipment, different mounting, different duct situation. These are usually a mini-split conversation rather than a ducted one, and they need to be assessed in person. Do not budget one off a neighbor's quote.
4. The ADU, converted garage or basement unit
A single-zone mini-split typically lands at the lower end of the $8,000 to $14,000 range. One caution landlords miss: PSE's electric-resistance conversion rebate applies when you are replacing existing resistance heat, not when you are conditioning a space that never had heat. New-to-heat spaces are a different conversation.
What landlords forget to budget for
- Electrical. A ducted heat pump wants a 30-40 amp 240V circuit; a mini-split wants 15-30 amps. Most panels 100 amps and up handle it. Old 60-amp fuse boxes and full panels do not, and a panel upgrade is a licensed electrician's scope on top of the HVAC price.
- Duct condition. Auburn's damp crawlspaces are hard on sheet metal and brutal on old flex duct. A great heat pump on leaking ducts is a great heat pump wasting a third of its output under the floor.
- Permits. Every install needs a mechanical permit, including like-for-like replacements. We pull it. Unpermitted mechanical work is a problem at resale, because Washington's seller disclosure asks about it directly.
- Tenant coordination. Access, parking, pets, work hours. Build a day into the schedule for it.
- Depreciation and expensing. HVAC on a rental is a capital item with its own tax treatment. Talk to your CPA before assuming it is a same-year write-off.
Who actually captures the savings?
Be clear-eyed about this. If the tenant pays utilities, the efficiency gain is theirs, not yours. What you get is a unit that rents faster, holds a tenant longer, and includes cooling — which in a Puget Sound summer has quietly become a listing feature people filter for. If you pay heat on a multi-unit building, the math is direct and the baseboard-conversion case gets very strong very fast.
Either way, the capital argument is the same: you are trading an unplanned $150 to $1,500 repair every winter on aging equipment for a known number and a 10-year parts and labor warranty. On a rental, that warranty is worth more than it is on a primary residence, because every service call on a tenant's schedule costs you time you were not planning to spend.
When we tell landlords not to do it
Honesty converts better than pressure, so: if the furnace is seven years old and healthy, and the property is going on the market in eighteen months, a heat pump is not the right use of your capital. Fix what is broken and move on. If the ductwork is failing and the equipment is fine, the ducts are the project. And if you are converting a unit that already has a young gas furnace, a hybrid setup that keeps the furnace as backup is often the cheaper, smarter build.
We would rather tell you that on the first visit than sell you a system you did not need.
Get a real number for your Auburn rental
Every property is different, and a rental estimate should account for tenant access, unit count and meter setup — not just square footage. Request a free in-home assessment at get an estimate or call (253) 785-4622, Monday through Friday, 8 to 6. We are based on S 344th St in Federal Way, about fifteen minutes from most of Auburn, and most installs are finished in one day.