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A heat pump install is a longer decision than a repair — you’re picking a system that runs your home for the next 15 to 20 years. The size has to match your house, the electrical has to support it, and the ductwork has to move the air the new system produces. Get one of those wrong and a brand-new high-efficiency system underperforms a properly-sized older one.
What’s Included in a Heat Pump Installation
1. In-home assessment
A tech visits the property, looks at the current heating and cooling setup, checks the electrical panel, inspects existing ductwork (if any), and measures the rooms. This is a full walkthrough, not a sales drop-off.
5. Old equipment removal
If we’re replacing a furnace, AC, or old heat pump, we remove and recycle the old equipment. Refrigerant in old AC or heat pump units is recovered to EPA standards — not vented.
2. Manual J load calculation
We calculate the actual heating and cooling load for your house. Square footage alone gives the wrong answer — insulation, window placement, ceiling height, and orientation all matter. An oversized heat pump short-cycles and dehumidifies poorly. An undersized one runs constantly and gives up on the coldest mornings.
6. Installation
Indoor air handler or furnace coil set, outdoor condenser mounted on a pad or wall bracket, line set run, condensate drain plumbed, electrical disconnect installed, low-voltage controls wired in. For ducted systems, we verify static pressure and modify ductwork where needed.
3. Equipment recommendation
Based on the load calc, your home layout, your budget, and any rebate targets, we recommend a specific system. You see the model numbers, the SEER2 and HSPF2 ratings, and the rebate eligibility before you decide. We install Mitsubishi Electric, Bosch, Trane, Carrier, Lennox, Goodman, and RunTru.
7. Commissioning
Once the system is installed, we charge it to the manufacturer’s spec, verify airflow at the registers, set up the thermostat, and run it through a full heating and cooling cycle.
4. Permits
Every heat pump install in King and Snohomish County requires a mechanical permit. We pull it. You don’t talk to the city.
8. Inspection coordination
The city inspector comes out within a week or two of the install. We schedule it and meet them on site.
Why Fuse Service
Why Choose Fuse Service
Licensed EPA-Certified Technicians
Every AC installation is handled by a licensed, EPA 608-certified technician — not a subcontractor. We size your system correctly from the first visit so you’re not paying to cool air that escapes through gaps in ductwork.
Same-Day Availability
We understand that Seattle summers are short and the cooling window is narrow. We offer same-day consultations and fast installation scheduling so your home is comfortable before the next heat wave hits.
Up to 10-Year Parts & Labor Warranty
New AC installations come with up to a 10-year parts and labor warranty. If something goes wrong after install — we come back and fix it. No service call charge, no fine print.
Upfront Pricing — No Surprises
You’ll get a clear written estimate before any work begins. No hidden fees, no post-install additions. The price we quote is the price you pay.
What Affects Heat Pump Installation Cost
Electrical capacity
A heat pump usually pulls between 20 and 50 amps. If your panel is already near capacity, you may need a sub-panel or a service upgrade. We flag this during the assessment, not on install day.
System type
A ducted central heat pump costs differently than a ductless multi-zone install. The right choice depends on whether you already have ductwork and whether you want zone-by-zone control.
Home size and load
A 1,200 sq ft cottage in Ballard and a 3,800 sq ft house in Sammamish need different equipment. The load calc decides.
Efficiency tier
Existing ducts that are well-sealed and properly sized keep the install simple. Older homes sometimes need a partial duct redesign or sealing — that adds cost but improves performance.
Electrical capacity
A heat pump usually pulls between 20 and 50 amps. If your panel is already near capacity, you may need a sub-panel or a service upgrade. We flag this during the assessment, not on install day.
Backup heat
Some homes benefit from an electric resistance backup strip or keeping the existing gas furnace as a dual-fuel backup. The choice affects equipment selection.
Ductwork condition
Indoor air handler or furnace coil set, outdoor condenser mounted on a pad or wall bracket, line set run, condensate drain plumbed, electrical disconnect installed, low-voltage controls wired in. For ducted systems, we verify static pressure and modify ductwork where needed.
Permit fees and inspection
Bellevue, Kirkland, Redmond, Seattle, and unincorporated King County all have slightly different permit fees. These are pass-through costs included in your quote.
Brands We Service
We install and service the major heat pump brands: Mitsubishi Electric, Bosch, Trane, Carrier, Lennox, Goodman, RunTru. Each tech is factory-trained on the systems we sell, and we stock the most common parts on the truck so most repairs don’t need a second visit.
Areas We Serve
Fuse Service provides AC installation across King County and Snohomish County. Whether you’re in Seattle proper or a surrounding suburb, our technicians are familiar with local building codes, permit requirements, and the specific cooling needs of Pacific Northwest homes.
Heat Pump Installation
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