The process starts with a site assessment and load calculation. The installer measures the home’s square footage, checks insulation levels, counts windows, and reviews the existing air handler or duct system. At Denver-metro elevations, altitude derating is applied to the load calculation so the compressor and outdoor coil are sized for actual output, not sea-level ratings. If the home has ducts, their condition and static pressure are checked before any equipment is specified. Homes without ducts are assessed for a ductless mini-split layout instead.
Once sizing is confirmed, the installer reviews the electrical panel for available capacity and identifies where the disconnect switch and new circuit will land. The outdoor unit location is chosen for airflow clearance and line set length, and a concrete pad is prepared for mounting. Copper line set is run between the outdoor condenser and the indoor air handler, pressure-tested, and charged with refrigerant to the manufacturer’s specification. Thermostat wiring is connected and configured for the system type. Lakewood building and electrical permits are pulled before work begins, covering both the mechanical and electrical scope under Jefferson County code requirements.
Startup testing is the final stage before the job is closed. The installer checks refrigerant pressure against the system’s rated operating range, measures airflow at the supply registers, and confirms the reversing valve switches correctly between heating and cooling modes. A post-install performance check records the system’s actual output against the specified capacity. If anything falls short, it is corrected before sign-off. Old equipment, including the removed outdoor unit and air handler, is taken off site as part of the installation scope. A heat pump installed and commissioned this way is typically expected to last 10 to 15 years with regular maintenance.