New Heat Pump & Air Handler Installation in Otis Orchards

When a homeowner in Otis Orchards noticed their old HVAC system struggling to keep up, they called our team for a full upgrade they could rely on. After evaluating the home and reviewing the replacement options, we installed a new Lennox heat pump and air handler to restore dependable year-round comfort. With permits approved and final inspections passed, the homeowner now has a high-efficiency system built for Spokane County’s seasonal swings.

Job Overview

• Location: Otis Orchards, WA
• Client Type: Single-family homeowner
• Scope: Full HVAC system replacement
• Equipment Installed: Lennox ML14XP1-048-230 heat pump, new air handler, heat strip, new line set
• Additional Work: Electrical and mechanical permits, thermostat circuits, condensate line work
• Why It Mattered: The homeowner needed a reliable, efficient system to replace an aging setup and meet local code requirements

What We Found

During our initial inspection, we found that the existing HVAC system was outdated and no longer operating efficiently. The heat pump and air handler showed signs of wear, and the components were struggling to maintain temperature during colder weather. The existing line set and wiring also required upgrades to properly support the new equipment. In addition, the condensate pump setup needed an electrical outlet for safe, code-compliant operation.

The Solution

Our installers began by safely removing the old indoor and outdoor units and preparing the space for the new Lennox system. A new line set was installed to ensure clean, efficient refrigerant flow. We set the ML14XP1 heat pump outdoors, leveled and secured it, then installed the new air handler and heat strip inside the home.
We completed all required electrical circuits, including thermostat wiring and support for the air handler and heat pump. Our team also handled the mechanical and electrical permit requirements, coordinated inspections, and ensured all work met Spokane County and Washington State L&I standards. Once everything was connected, we pressure-tested, charged, and verified refrigerant levels, then ran a full system startup to confirm proper airflow, heating, and cooling performance.

The Results

After installation and testing, the home now has a smooth-running, high-efficiency HVAC system ready for all seasons. The upgraded heat pump provides dependable heating and cooling, while the new air handler delivers quieter, more consistent airflow. The homeowner benefits from improved comfort, greater reliability, and a system built to operate efficiently for years to come.

Solutions, Not Surprises

If you’re in Otis Orchards or the Greater Spokane area and considering a new HVAC system, our team at Mainstream Electric, Heating, Cooling & Plumbing is here to help. We install high-quality systems built for the Inland Northwest climate and handle everything from permits to final testing. When you’re ready for a quote or want to explore replacement options, schedule online or give us a call.