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.
Heritage. Standard. Method.
Three things that show up on every job in Portland and SW Washington.
Same Values Since 1972.
"Do honest work, know your craft, stand behind your word." The Larsell Mechanical founding standard, written down in 1972 and never edited. Three generations of craftsmen have practiced the same operating discipline. The name changed in 2025. The way the work gets done did not.
Clean. Quality. Comfort.
"What we promise the homeowner, every visit." 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.
We Don't Guess. We Test.
"Real instruments. Real measurements. Every job." 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.
Four steps. Every job. No shortcuts.
From repair calls to whole-system replacements in Portland and SW Washington.
We test.
Real instruments, not rules of thumb. 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 kit on every Tru72 Portland truck: Manual J load calc · refrigerant scale · combustion analyzer · manometer · anemometer · infrared thermal camera · multimeter · CO meter.
What it means: The diagnostic kit on every Tru72 Portland truck is the same kit a manufacturer rep would carry: ACCA-grade instruments, calibrated, traceable.
We translate.
The numbers become plain English. 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."
What it means: Every measurement gets a translation. Every translation gets a "what we'd do about it."
We install.
The plan matches the measurement. 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.
What it means: The homeowner sees the install plan before any commitment, and the install plan references the diagnostic numbers it was built on.
We commission.
The system gets verified before we leave. 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.
What it means: If the numbers don't match the design, we adjust before we leave.
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. |
The instruments, one at a time.
Each measurement, explained.
Sizing
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.
Heat pumps
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.
Gas appliances
Combustion analysis
Every Tru72 gas appliance install or repair in Portland includes a combustion analyzer reading. CO, O2, stack temperature, draft verified.
Whole home
Home performance testing
Blower-door test, duct leakage, thermal imaging. Where your Portland-area home is losing comfort and energy, measured with numbers.
Air quality
Indoor air quality assessment
Humidity, particulates, VOCs, allergens measured before any equipment recommendation. The data drives the design.
Zoned comfort
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.
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
