Dual Fuel HVAC Replacement in Kirkland, WA
Our team recently completed a full heat pump and furnace replacement in Kirkland, WA, helping another homeowner upgrade to a more energy-efficient and reliable HVAC system. The project included removing the existing heating and cooling equipment and installing a modern dual fuel system designed to provide year-round comfort in the Pacific Northwest.

Location: Kirkland, WA
Service Performed: Complete HVAC system replacement

The homeowner wanted to replace an aging furnace and cooling system with equipment that would deliver better comfort, improved energy efficiency, and dependable heating during Washington’s cold winter months.
After evaluating the home’s existing HVAC system, our technicians installed a new Trane gas furnace paired with a Quest Resolute cold climate inverter heat pump, creating a high-performance dual fuel heating and cooling solution.

Neither unit had failed outright, which is usually the best time to plan a replacement rather than react to one. Scheduling the work ahead of a breakdown gave the homeowner time to compare equipment, take advantage of current utility rebates, and have the new system running well before the first cold snap.

Trane Furnace and Quest Heat Pump Equipment Installed

For this installation, we completed the following work:

• Installed a Trane 80% AFUE ECM Gas Furnace (80,000 BTU)
• Installed a Quest Resolute 3-Ton Cold Climate Inverter Heat Pump
• Installed a new indoor evaporator coil
• Replaced the refrigerant line set
• Installed a new supply air plenum
• Installed a new filter box and air filter
• Installed a new outdoor equipment pad
• Completed electrical and gas line connections
• Installed a new condensate drain system

To improve overall airflow throughout the home, we also installed a new return air duct and return air grille, helping the system operate more efficiently while providing better indoor comfort.

The supply air plenum and filter box were fabricated for this equipment rather than reused. Old plenums are sized for the old blower, and forcing new equipment into ductwork it was never matched to is one of the most common reasons a correctly sized system still underperforms.

Old Furnace and AC Removal

Before installing the new equipment, our technicians safely disconnected and removed the old furnace and outdoor unit. All outdated materials were hauled away and properly recycled.
The new system was installed according to manufacturer specifications and all applicable Washington mechanical and electrical codes.

Taking the old equipment out cleanly matters more than it sounds. Rushed removals leave behind damaged duct connections, abandoned wiring and refrigerant that was never properly recovered — all of which the next technician ends up dealing with.

How a Dual Fuel Heat Pump and Furnace System Works

A dual fuel system combines the efficiency of an inverter heat pump with the reliability of a gas furnace.
During mild and cool weather, the heat pump provides efficient heating while using significantly less energy. When outdoor temperatures become very cold, the furnace automatically takes over, ensuring consistent comfort throughout the home.

The switchover point is set during installation and configured at the thermostat. Above it, the system runs the heat pump, which moves existing heat into the house instead of burning fuel to create it. Below it, the furnace takes over. In the Kirkland climate that means the heat pump carries most of the heating season on its own, and the furnace is there for the handful of weeks each winter when it is genuinely needed.

This solution offers several long-term benefits:

• Lower heating and cooling costs
• Reliable winter performance
• Quiet system operation
• Better indoor temperature control
• Improved airflow throughout the home
• Increased overall system efficiency

HVAC Permits, Startup and System Testing

As part of this project, we obtained the required mechanical and electrical permits before installation.

Our certified installers completed:

• Removal of the old HVAC equipment
• Installation of the indoor and outdoor units
• Refrigerant piping replacement
• Electrical upgrades
• Gas piping connections
• System startup and performance testing
• Final safety inspection

Every system is thoroughly tested before completion to ensure it operates safely and performs according to manufacturer specifications.

Permits are pulled before any equipment is set, not after. Washington requires both a mechanical and an electrical permit for work at this scope, and an unpermitted system tends to surface later — at resale, or the first time an insurance claim touches the HVAC.

Heat Pump and Furnace Warranty Coverage

The homeowner received:

• Up to 10-year manufacturer parts warranty
• 3-year labor warranty
• Installation performed by experienced HVAC technicians

The full parts term depends on registering the equipment with the manufacturer after installation, which is easy to forget and expensive to miss. We handle the registration as part of closing out the job.

Heat Pump Installation in Kirkland and the Eastside

This completed project is another example of how upgrading to a modern dual fuel HVAC system can improve comfort, reduce energy consumption, and provide dependable heating throughout the year.
If you’re considering replacing an older furnace or air conditioning system, our team provides professional heat pump installation, furnace replacement, and complete HVAC system upgrades in Kirkland, WA, as well as Bellevue, Redmond, Bothell, Woodinville, and surrounding communities.
Every home is different, and we design each HVAC installation to match the home’s size, heating requirements, and the homeowner’s long-term energy goals.