Estimated Read Time: 12 minutes
Wondering what your HVAC replacement cost will be? This guide breaks down HVAC replacement costs by home size in Greater Seattle, so you can budget with confidence and avoid surprises. We’ll show typical price ranges, what drives cost up or down, and how to save with rebates and financing. Plus, you’ll see how a proper load calculation and right‑sized equipment keeps your home comfortable year‑round. Free proposals available, and select installs start as low as $209 per month.
How Much Does HVAC Replacement Cost in Greater Seattle?
Replacing a complete HVAC system typically ranges from $8,500 to $22,000+ depending on home size, ductwork, and system type. Homes with tight envelopes and modern ducts fall on the lower end. Older homes, complex duct changes, or high‑efficiency heat pumps can raise cost. The goal is not the cheapest box. It is the right system, sized and installed well, that lowers bills and avoids repairs.
Two hard facts to ground your estimate:
- Since 2023, new central AC ratings use SEER2. A higher SEER2 rating means better efficiency and lower cooling costs.
- The federal Energy Efficient Home Improvement Credit offers up to $2,000 for qualifying heat pump installations and up to $600 for qualifying central AC or furnaces. Check eligibility before you buy.
Local insight: many Seattle and Eastside homes are mid‑century or Craftsman with tight mechanical spaces and mixed duct quality. That can influence labor and the best system choice.
Cost by Home Size: Small Homes and Condos (up to ~1,200 sq. ft.)
Typical replacements fit smaller furnaces with a single‑stage or two‑stage blower and either a compact heat pump or a 1.5 to 2‑ton AC. Ductless can be ideal for condos or homes without ducts.
Typical ranges:
- Gas furnace + AC: $8,500 to $13,500
- Cold‑climate heat pump + air handler: $10,500 to $16,500
- Single‑zone ductless heat pump: $4,500 to $8,500
What affects price:
- Electrical capacity for a heat pump or air handler
- Condo HOA rules, line‑set runs, and roof or wall penetrations
- Smart thermostat and filtration upgrades
Tip: In smaller homes, right‑sizing matters. Oversized units short cycle, create noise, and waste money.
Cost by Home Size: Mid‑Size Homes (~1,200 to 2,000 sq. ft.)
This is common across Bellevue, Kirkland, and Bothell ramblers and split‑levels. Systems often jump to 2 to 3 tons with multi‑stage capability for better comfort.
Typical ranges:
- Gas furnace + AC (two‑stage): $11,500 to $17,500
- Heat pump + air handler (high efficiency): $13,500 to $19,500
- Two‑zone ductless heat pump: $8,500 to $15,500
What affects price:
- Duct condition and static pressure
- Return‑air sizing to reduce noise and improve airflow
- Zoning needs for upstairs comfort
Tip: Consider a heat pump for year‑round comfort and potential tax credits. Many Puget Sound homes benefit from efficient heating in shoulder seasons.
Cost by Home Size: Large Homes (~2,000 to 3,000+ sq. ft.)
Larger homes in Redmond or Sammamish may need larger capacity, multi‑zone control, or two systems. Expect more design work and commissioning.
Typical ranges:
- High‑efficiency furnace + AC with zoning: $15,500 to $22,000+
- Variable‑speed heat pump system with zoning: $17,500 to $28,000+
- Multi‑zone ductless (3 to 5 heads): $14,000 to $28,000+
What affects price:
- Number of zones and smart dampers
- Lengthy refrigerant line runs, attic or crawlspace work
- IAQ add‑ons like media filters, UV, or ERVs
Tip: Large homes get big gains from variable‑speed equipment. Quieter operation, steadier temps, and lower humidity swings.
Furnace + AC vs. Heat Pump vs. Ductless
- Furnace + AC: Familiar, strong heating on the coldest nights. Pairing a two‑stage or variable‑speed furnace with properly sized AC improves comfort and noise.
- Heat pump + air handler: Efficient heating and cooling from one system. With today’s cold‑climate models, many homes can rely on heat pumps most of the year and keep a furnace as backup if preferred.
- Ductless heat pump: Great for homes without ducts, additions, or rooms that run hot or cold. Multiple heads can zone the home. Very efficient when designed well.
We install and replace across leading brands, including Carrier, Trane, Viessmann, and Mitsubishi. That breadth helps us match performance, budget, and comfort goals.
What Actually Drives Your HVAC Replacement Cost
- Load calculation and sizing
- Proper sizing avoids hot‑cold swings and high bills. We perform room‑by‑room calculations and design to the Washington State Energy Code requirements for airflow and duct sealing.
- Ductwork condition
- Leaks or undersized returns increase noise and reduce comfort. Correcting these can be the best dollars you spend.
- Efficiency level
- Higher SEER2 and HSPF2 ratings cost more upfront but can lower bills for years.
- Electrical and controls
- Heat pumps often need a dedicated circuit. Smart thermostats add comfort features and reporting.
- Installation complexity
- Attic or crawlspace work, refrigerant line lengths, and condensate routing all add labor.
- Local permits and inspections
- Seattle and King County permits and inspections protect your investment and verify safe operation.
Permits, Code, and Inspections in the Seattle Area
- Most replacements require mechanical permits and final inspections. This safeguards venting, gas connections, electrical, and condensate management.
- Duct testing and sealing are often required on new or modified ducts under the Washington State Energy Code. Tight ducts improve comfort and bills.
- We handle permitting, scheduling, and documentation so your project moves smoothly.
Ways to Save: Rebates, Credits, and Utility Incentives
- Federal Energy Efficient Home Improvement Credit: up to $2,000 for qualifying heat pumps. Up to $600 for qualifying central AC or gas furnaces. Subject to IRS rules and annual caps.
- Local utility rebates: Puget Sound Energy and Seattle City Light often offer incentives for efficient heat pumps and smart thermostats. Programs change. We help you apply.
- Manufacturer promotions: Seasonal rebates on select Carrier, Trane, Viessmann, and Mitsubishi models may stack with credits.
- Financing: Spread cost with low monthly payments for approved credit.
Example Project Scenarios and Ballpark Pricing
- 1,300 sq. ft. rambler in Kirkland replacing a 20‑year‑old furnace and 2‑ton AC
- Two‑stage furnace + 2‑ton SEER2 AC, new return, smart thermostat
- Typical: $12,500 to $15,500 before incentives
- 1,900 sq. ft. Bellevue split‑level switching to a heat pump
- 3‑ton cold‑climate heat pump + air handler, panel check, pad, condensate pump
- Typical: $15,000 to $19,000 before incentives
- 2,600 sq. ft. Redmond two‑story adding zoning
- Variable‑speed heat pump with two zones, damper kit, controls, duct balancing
- Typical: $20,000 to $27,000 before incentives
Your numbers may differ based on ducts, electrical, and home envelope. A free in‑home proposal will firm up pricing.
Timeline: How Long Will It Take?
- Consultation and proposal: 60 to 90 minutes on site
- Permitting: 1 to 5 business days depending on jurisdiction
- Installation: 1 to 3 days for most systems; add a day for zoning or major duct changes
- Commissioning and walkthrough: same day as install completion
- Post‑install support: our 24/7 Service Department supports you after installation
What to Ask Before You Approve the Proposal
- Did you perform a Manual J load calculation and verify duct static pressure?
- What SEER2, HSPF2, and AFUE levels are quoted and why?
- Will the installer commission the system and verify temperatures, airflow, and refrigerant charge?
- What is covered by warranties, and who registers them?
- How will rebates and tax credits be handled?
Why Installation Quality Matters More Than the Sticker Price
A top brand installed poorly will underperform a mid‑range system installed correctly. Our vans are fully stocked with parts, which helps complete most tasks on the first visit. Upfront pricing and clear communication prevent scope creep. Commissioning and a careful walkthrough ensure the system matches the design and works as promised.
Maintenance and Long‑Term Costs
A well‑installed system plus planned maintenance can delay repairs and reduce lifetime cost. Our planned maintenance program can save you money on repairs and improve your system’s lifespan, performance, and efficiency. Expect one cooling and one heating tune‑up per year, filter changes on schedule, and airflow checks that keep comfort consistent.
Getting Your Best‑Value Quote in Greater Seattle
- Schedule a free in‑home proposal. We analyze your home, ducts, and goals.
- Compare two or three right‑sized options: good, better, best.
- Ask about financing, utility rebates, and federal credits.
- Review the installation plan, timeline, and post‑install support.
- Approve, and we assign a dedicated project lead and keep you updated.
Cardinal Heating & Air offers 24/7 emergency service throughout the Greater Seattle area, partners with leading brands, and provides same‑day service when possible. That combination speeds up your project and protects your investment.
Quick Price Checklist Before You Buy
- Confirm load calculation and duct static readings
- Verify model numbers with stated SEER2/HSPF2/AFUE
- Include permit fees and disposal
- Add thermostat, pads, line sets, and electrical in the scope
- List warranties and maintenance plan options
Ready to see your exact numbers? We can be at your home as soon as today for select appointments.
Special Offers for Seattle‑Area Homeowners
- Heat Pump Install for as low as $209/mo + Free Proposal + Same Day Service. Call (425) 827-9997.
- A/C Install for as low as $209/mo + Free Proposal + Same Day Service. Call (425) 827-9997.
- Furnace Install for as low as $69/mo + Free Proposal + Same Day Service. Call (425) 827-9997.
- Free in‑home estimates for heating and boiler services. Visit http://cardinalheating.com/ to schedule.
Financing options available on approved credit. Ask about current rebates and tax credits to stack your savings.
What Homeowners Are Saying
"Exceptional and highly professional installation by Drew Fisk and Scott. One of the finest examples of teamwork I have seen in a long time. The whole process was explained in detail, combined with the expert installation makes these individuals a lasting credit to the Cardinal Heating Team. I would highly recommend that you request either or both these gentlemen for any task you might need."
–HVAC Installation, Greater Seattle
"We recently purchased a very old home, over 130 years old, and worked with Cardinal HVAC for our installation. Luis and Luis were our technicians and installers, and they were absolutely fabulous. They arrived on time, communicated clearly, worked efficiently, and kept our home clean and well cared for throughout the process... Josh, who managed our sales, was equally outstanding... Three months after our install, he continues to check in to ensure our system is working perfectly."
–HVAC Installation, Seattle
"I just had a heat pump system installed by Cardinal Heating and Air. Dan and his team did an excellent job of installing the heat pump, reconfiguring my furnace and making sure everything was working perfectly. After all of that work, their clean-up was top notch. I would highly recommend this company and their products."
–Heat Pump Install, Eastside
"We had the new heat pump system installed in July 2024 with a new ducted system for the second floor... The Cardinal installation team really did an excellent job. They were also very professional, and thoughtfully walked us through some of the installation issues and decisions we needed to make. Their daily cleanup was excellent."
–Heat Pump + Ducting, Seattle
Frequently Asked Questions
How much does HVAC replacement cost for a 1,500 sq. ft. home in Seattle?
Most 1,500 sq. ft. homes run $12,000 to $18,000 depending on ducts, efficiency, and system type. A free in‑home proposal will narrow it down.
Is a heat pump worth it in Puget Sound’s climate?
Yes. Heat pumps deliver efficient heating and cooling most of the year. Many qualify for a federal credit up to $2,000, which improves payback.
Do I need new ductwork when replacing my system?
Not always. If ducts are leaky or undersized, targeted repairs or returns can improve comfort and reduce noise. We measure before recommending changes.
How long does installation take?
Most replacements take 1 to 3 days. Add time for zoning, major duct changes, or complex electrical work. We provide a clear schedule up front.
What maintenance is required after replacement?
Plan on two tune‑ups per year and regular filter changes. Our maintenance plan helps extend lifespan and reduce repairs.
Conclusion
Your HVAC replacement cost depends on home size, ducts, and system type. With the right design and a trusted installer, you get lower bills and steadier comfort. For the best experience, choose a local team that understands Seattle homes and codes.
Call, Schedule, or Chat
Get your free proposal today for HVAC replacement costs in Greater Seattle. Call (425) 827-9997, visit http://cardinalheating.com/, or schedule online. Ask about installs starting as low as $209 per month and current rebates to maximize savings.
Ready for a precise, written quote? Call (425) 827-9997 or visit http://cardinalheating.com/ to book your free in‑home proposal. Mention the $209/mo install offers when you call to check eligibility for your home.
Cardinal Heating & Air has served Puget Sound homes since 1991 with NATE‑certified techs, 24/7 service, and design‑build expertise for custom projects. We install leading brands like Carrier, Trane, Viessmann, and Mitsubishi, and back every job with upfront pricing and flexible financing. Our vans are fully stocked to finish most installs fast, and our 24/7 Service Department supports you long after the install. Choose local experts who know Seattle codes, weather, and homes.