A heat pump that looks efficient on paper can waste a surprising amount of energy if it's installed poorly or connected to leaky ducts. The Northwest's answer to that problem is a quality-assurance approach often referred to by the program name PTCS — Performance Tested Comfort Systems. Rather than trusting equipment ratings alone, PTCS verifies that a heat pump and its ductwork actually perform well after installation. Understanding this idea explains a lot about why regional programs emphasize contractor quality.
The Problem With "Rated" Performance
Manufacturer efficiency ratings are measured in a lab under ideal conditions. In the field, performance depends on correct refrigerant charge, proper airflow, right-sized equipment, and tight ducts. Studies have repeatedly found that duct leakage and installation errors can erode a large share of a system's expected savings. A high-efficiency heat pump feeding leaky attic ducts may deliver only a fraction of its promise.
What PTCS Verifies
The PTCS approach uses trained, certified technicians and diagnostic testing to confirm that a system is installed to perform. Typical checks include measuring duct leakage with a duct-testing fan, verifying airflow across the coil, confirming correct refrigerant charge, and documenting the results. Systems that pass earn recognition that utilities can tie to incentives — aligning the financial reward with verified quality rather than just the purchase of equipment.
Duct Sealing as a Measure in Its Own Right
Even without new equipment, sealing and testing existing ducts is a valuable efficiency measure. In homes with ducts running through unconditioned attics or crawlspaces, leakage sends expensive conditioned air where no one benefits. Professional duct sealing — verified with a pressure test — can recover meaningful energy and improve comfort. The U.S. Department of Energy's guidance on minimizing duct losses explains the fundamentals.
Why It Matters for the Region
Field verification is a quiet but crucial reason Northwest efficiency claims hold up over time. By insisting that heat pumps and ducts are tested, not just installed, regional programs protect the energy savings they pay for and give homeowners systems that actually deliver comfort at lower cost. It also raises the bar for the regional HVAC workforce, since technicians must be trained and certified to perform the diagnostics.
What to Ask For
If you're installing or replacing a heat pump, ask whether your contractor performs field commissioning — duct testing, airflow, and charge verification — and whether the work qualifies for local incentives that require it. Choosing a contractor who tests their work is one of the most reliable ways to make sure your investment performs. Continue with our ductless heat pump guide for the equipment side of the story.