Professional Heat Pump Installation in Seattle

Our heat pump installation protocol in Seattle, WA, is engineered for full compliance with the Seattle Building Code (SBC) and Washington State Energy Code (WSEC) requirements for residential and commercial electrification. We initiate every project with a comprehensive ACCA Manual J load calculation, utilizing Wrightsoft software to precisely model the thermal envelope, accounting for U-factors of fenestration, insulation R-values, air infiltration rates (ACH50), and internal heat gains. System selection prioritizes models listed on the NEEP Cold Climate Air-Source Heat Pump (ccASHP) list, ensuring high Coefficient of Performance (COP) and Heating Seasonal Performance Factor (HSPF2) ratings, even at our design temperature of 21°F. For refrigerant line sets (typically ACR copper), all joints are brazed with a 15% silver-phosphorus-copper alloy under a nitrogen purge to prevent interior oxidation and subsequent contamination of the TEV or compressor. Following installation, we conduct a meticulous evacuation process, pulling the system down to below 500 microns as measured by a digital micron gauge to remove all non-condensables and moisture. The system is then charged to the manufacturer's specified subcooling (for TXV systems) or superheat (for fixed orifice systems) values, verified with digital manifold gauges and pipe clamps. We ensure all electrical circuits, including disconnects and overcurrent protection, adhere to NEC Article 440. All installations are subject to inspection by the Seattle Department of Construction & Inspections (SDCI), and we provide homeowners with a complete documentation package, including the AHRI certificate, compliance forms, and warranty information required for securing local utility rebates from Seattle City Light or Puget Sound Energy.