The Tru72 Operating Philosophy · Portland & SW Washington
We don't guess. We test.
Most HVAC companies size your system by square footage, fill refrigerant by gauge pressure, and skip combustion analysis because it takes ten extra minutes. We don't. Every Tru72 Portland job is run with real instruments and real measurements, the same way the Larsell family has run it since April of 1972. The methodology has a name. It's been there for fifty-three years.
- 1972Same standard, written down and never edited
- 8 instrumentsOn every Portland truck, every job
- $72Diagnostic, credited to the repair
$72 diagnostic fee, credited to the repair when you proceed. Mission Ready Plan members pay $39.
The Portland diagnostic standard, in four facts
- Since 1972Larsell Mechanical heritage, carried north to Lake Oswego.
- Manual JBefore sizing. Every replacement.
- By weightRefrigerant weighed, not eyeballed.
- Every gas jobCombustion analysis on every gas appliance.
- Oregon CCB #40820
- WA Contractor #LARSEMS742D7
Heritage. Standard. Method.
Three things that show up on every job in Portland and SW Washington.
Heritage — same values since 1972.
The Larsell Mechanical founding standard, written down in 1972 and never edited. Three generations of craftsmen have practiced the same operating discipline, and the Portland office was opened to run it here. The name changed in 2025. The way the work gets done did not.
"Do honest work, know your craft, stand behind your word."
What it means: The crew in your Portland-area home did not learn this method last year. It arrived already fifty-three years old.
Standard — clean, quality, comfort.
Clean means the technician leaves the home cleaner than they found it. Quality means the install matches the design and the design matches the data. Comfort means the system delivers what was measured for, in every room.
"What we promise the homeowner, every visit."
What it means: Three words you can check us against after we leave, not three words on a truck.
Method — we don't guess, we test.
The diagnostic-first method. Manual J before sizing. Refrigerant weighed, not eyeballed. Combustion analysis on every gas appliance. Static pressure on every duct system. The numbers, on paper, before any recommendation.
"Real instruments. Real measurements. Every job."
What it means: You get the readings before you get the recommendation, so you can see what the recommendation is built on.
The instruments, one at a time.
The diagnostic kit on every Tru72 Portland truck is the same kit a manufacturer rep would carry: ACCA-grade instruments, calibrated, traceable. Here is what each one reads, and what the reading tells you.
Manual J load calculation
Measures how much heating and cooling your specific home actually needs — square footage by room, ceiling heights, window count and orientation, insulation, infiltration, Pacific Northwest climate.
What it means: The new system is sized to your house instead of to the tonnage of the old one.
Refrigerant scale
Weighs the refrigerant charge going into the system, per circuit, against the manufacturer specification.
What it means: The charge is a number written on your invoice, not a guess read off a gauge.
Combustion analyzer
Reads carbon monoxide, oxygen, stack temperature and draft at every gas appliance we install or service.
What it means: You know the furnace is burning clean, and there is a logged reading that says so.
Manometer
Reads static pressure — how hard the blower motor is working to push air through your ductwork.
What it means: High static pressure is why a blower motor wears out at year 8 instead of year 15. It is measurable before it costs you a motor.
Anemometer
Measures actual airflow at the registers, so delivered air can be compared against the design airflow.
What it means: The room that never gets warm usually has an airflow number behind it, not a mystery.
Infrared thermal camera
Shows temperature differences across walls, ceilings, ducts and windows.
What it means: Missing insulation and duct leaks stop being an opinion and start being a picture.
Multimeter
Reads the electrical side — voltage, amperage and capacitance at the motors and controls.
What it means: A failing capacitor is a cheap part found early or a no-heat call found late.
CO meter
Reads carbon monoxide in the living space, not just at the appliance.
What it means: This one is a safety check, and it is not optional on a gas job.
What "industry standard" actually means.
Versus what the diagnostic-first method requires.
| What is being compared | Industry standard | Tru72 |
|---|---|---|
| Sizing a replacement | "Your old system was 4 tons, so we install 4 tons." | Manual J load calculation. Right-sized to your actual home. |
| Charging refrigerant | Read gauge pressure, top up by feel. | Refrigerant weighed to the manufacturer specification, per circuit. |
| Gas appliance install | "It's lit, the homeowner has heat, done." | Combustion analyzer on every gas appliance. CO, O2, stack temp logged. |
| Ductwork sizing | "The old ducts are there, we'll reuse them." | Static pressure measured. Manual D for any new design. |
| After the install | "It's on, we leave." | Commissioning report. Performance verified against design. |
| Warranty filing | "Here's the manufacturer's number, call them." | Manual J on file. Diagnostic logs archived. Warranty defensible. |
| Rebate filing | "You can apply yourself. Here's the form." | ETO and federal rebates filed at install. We do the paperwork. |
What it means: Every row on the right is a thing you can ask us to show you on paper.
Four steps. Every job. No shortcuts.
From repair calls to whole-system replacements in Portland and SW Washington.
We test.
Before any recommendation, the technician measures what's actually happening in your system. Refrigerant weight, combustion gases, static pressure, electrical readings, temperature splits, infiltration sources. The diagnostic kit on every Tru72 Portland truck is the same kit a manufacturer rep would carry: ACCA-grade instruments, calibrated, traceable.
What it means: Real instruments, not rules of thumb.
We translate.
Most HVAC reports are written for other contractors, not homeowners. Tru72 hands you the data and the meaning together. "Your static pressure is 0.94 inches of water column, which is 35% above design. That's why your blower motor wore out at year 8 instead of year 15." Every measurement gets a translation. Every translation gets a "what we'd do about it."
What it means: The numbers become plain English.
We install.
The install plan is built from the diagnostic data, not from a generic catalog default. Right-sized equipment from Daikin or Goodman. Ductwork modified where the static pressure showed it had to be. Refrigerant charged by weight, not by gauge guess. The homeowner sees the install plan before any commitment, and the install plan references the diagnostic numbers it was built on.
What it means: The plan matches the measurement.
We commission.
Commissioning is the step almost no HVAC contractor performs. After the install, we re-measure the system performance to confirm it matches the design. Refrigerant subcooling and superheat verified. Combustion confirmed. Static pressure logged. The homeowner gets a commissioning report alongside the install paperwork. If the numbers don't match the design, we adjust before we leave.
What it means: The system gets verified before we leave.
Dive deeper. Each measurement, explained.
Manual J load calculation
The ACCA-standard load calculation that determines correct HVAC sizing. Tru72 runs one on every replacement install in Portland at no extra cost.
Cold-climate heat pump installs
Why Portland-area homes need heat pumps engineered for the Pacific Northwest climate, and how Tru72 sizes them with Manual J on every job.
Combustion analysis
Every Tru72 gas appliance install or repair in Portland includes a combustion analyzer reading. CO, O2, stack temperature, draft verified.
Home performance testing
Blower-door test, duct leakage, thermal imaging. Where your Portland-area home is losing comfort and energy, measured with numbers.
Indoor air quality assessment
Humidity, particulates, VOCs, allergens measured before any equipment recommendation. The data drives the design.
Ductless installs & service
Zone-by-zone Manual J on new installs. Service on existing mini-splits regardless of who installed them. Most contractors won't.
Diagnostic-first is not a marketing claim.
It's how the work got done in 1972.
The diagnostic-first method has always been the method on 1st Avenue in Albany. The instruments improved over the years, the software got better, the trucks got newer, but the way the work gets done has not changed in fifty-three years. Measure first. Recommend second. Stand behind your word.
The Oyler brothers acquired the residential side of Larsell Mechanical in 2025 because the discipline was already there. Tru72 Portland is the same crew, the same standard, the same diagnostic kit, dispatching from Lake Oswego across the Portland metro and Southwest Washington.
Same handshake. Same standard. Same method.
How the diagnostic actually works.
Straight answers on tools, cost, and what happens next.
What instruments does a Tru72 Portland technician bring to a diagnostic visit?
A refrigerant scale, a combustion analyzer, a manometer for static pressure, an anemometer for airflow, a multimeter for electrical readings, an infrared thermal camera and a CO meter. The same kit rides to a routine repair call in Beaverton as to a full replacement estimate in Vancouver, because the diagnostic is what tells us which of the two you actually need. The instruments do the talking; the technician translates before anything is proposed.
What does a static pressure test show, and why does it matter?
A manometer reads how hard your blower motor is working to push air through the ductwork. High static pressure means the ducts are choking the airflow, which is a common reason a motor fails years early or a system never quite heats or cools the way it should. Low or uneven readings can point to leaky or disconnected duct runs, which is worth knowing in older Portland-area homes with retrofitted ductwork. Tru72 measures it on repair calls and installs alike, because a new unit dropped onto a duct system that was never sized right inherits the same problem the old one had.
What is a Manual J load calculation, and why do it before recommending a replacement?
Manual J is the ACCA-standard calculation of how much heating and cooling your specific home actually needs: square footage, insulation, window count and orientation, ceiling height, infiltration and local climate. Most oversized and undersized systems trace back to skipping it and simply matching whatever tonnage was already sitting in the closet. Tru72 runs one before recommending any replacement in Portland or Southwest Washington, at no extra cost, so the new system is sized to your house rather than to a guess.
What happens if the diagnostic shows a repair is the better call than a full replacement?
We say so. The point of testing before recommending is that the data decides, not a sales quota. If the instruments show a failing capacitor or a refrigerant leak that a repair will fix, Tru72 recommends the repair and explains why a replacement isn't warranted yet. Same Values Since 1972 means the diagnosis drives the recommendation, whichever direction that takes the conversation.
How does the $72 diagnostic fee work?
The $72 buys a real diagnostic visit: a technician on site with instruments, running measurements, and leaving you with a written finding rather than a sales pitch dressed up as a service call. Approve the recommended repair and that $72 is credited toward the cost of the work, so you are not paying for the same visit twice. Mission Ready Plan members pay $39 for the identical visit.
Who qualifies for the $39 Mission Ready diagnostic rate?
First responders, teachers, and active or veteran military. The Mission Ready Plan sets the diagnostic fee at $39 instead of $72. It is Tru72's way of saying thank you to the people who serve our communities, and it changes the price of the visit and nothing else: the same instruments, the same measurements, the same written finding.
Schedule a real diagnostic.
No guess. No upsell. Just the numbers. Whether it's a repair call, a maintenance visit, or a replacement estimate, every Tru72 Portland job starts with real measurements. $72 diagnostic fee, credited to the repair when you proceed. Mission Ready Plan members pay $39.
- Portland Metro & SW Washington(541) 652-6299
The diagnostic-first method across Portland metro and Southwest Washington
Tru72 Heating & Cooling runs the same instrumented diagnostic on every job in Portland, Lake Oswego, Beaverton, Tigard, Tualatin, West Linn, Oregon City, Vancouver, Camas, Washougal, Battle Ground, Ridgefield and La Center, dispatched from 5 Centerpointe Dr, Ste 87, Lake Oswego. Manual J before sizing. Refrigerant weighed to spec. Combustion analysis on every gas appliance. Static pressure on every duct system. $72 diagnostic, credited toward the repair. Oregon CCB #40820 · WA #LARSEMS742D7.
