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Top-Rated Geothermal heating or cooling system installers in Seattle - Updated Nov 2026

Avatar for Greenwood Heating and Home Services
Greenwood Heating and Home Services
4.6(
425
)
Geothermal Heating or Cooling System - Install

Serving Seattle, WA and surrounding areas

Approved

In business since 1921

Emergency services offered

Warranties offered

"My experience with Greenwood Heating and Air Conditioning has been entirely positive. From my free estimate appointment through finished installation, the process was seamless. Each and every representative of theirs has been exceptional. Trevor negotiated a very competitive, all inclusive price for the entire system and followed up on the day of installation to see how everything was going. The install was expertly performed by an industry pro, Andril, with 17 years plus experience. Follow-up has been exceptional. Greenwood Heating has earned my unequivocal recommendation."
Signature Install
Greenwood Plumbing
Greenwood Fleet
Greenwood University
Response time11 hrs
Response rate100%
19 neighbors recently requested a quote
Avatar for Air Masters Inc
Air Masters Inc
4.6(
181
)
Geothermal Heating or Cooling System - Install

Serving Seattle, WA and surrounding areas

Approved

In business since 1986

Free estimates

Emergency services offered

"Completely removed old heating system and installed new heat pump system in 2 days. Customer rep followed up with an installation verification and provided system details. All work was professional quality and technicians were very courteous and professional."
Installation of Ductless Heat Pump AC System
Gas Furnace Installation
Another Happy Air Masters Heating and Cooling Client with their new Lennox Heat Pump System
Another Happy Air Masters Heating and Cooling Client with their new Lennox Heat Pump System
Furnace System Installation.  Call Air Masters Heating & Cooling for your next HVAC upgrade or replacement.

+46

Response time2 days
Response rate100%
6 neighbors recently requested a quote
Avatar for Evergreen Home Heating & Energy
Evergreen Home Heating & Energy
4.4(
106
)
Geothermal Heating or Cooling System - Install

Serving Seattle, WA and surrounding areas

Approved

In business since 1975

Free estimates

Emergency services offered

"Evergreen installed a new hybrid heat pump system in my house. After researching the options, Evergreen was not only the most reasonable price, but they also scoped out a hybrid system where they would install new duct work and a single air exchanger in the attic and a minisplit in the basement. Scott, the sales person, did not try to upsell me on number of zones (others tried to get me to get 2 units in the basement) and after 2 months with the system, the single unit in the basement is heating the whole basement to our needs. All this was done at a price still considerably lower than the "standard" system price being offered by one of the bigger, similarly named companies. Evergreen was also the only company to propose a hybrid system where they would install a single exchanger in the attic and run new ceiling ducts to the rooms. This was appealing because we don't need to have the cassettes in each room and we didn't need to line the outside of the house with conduit for the cassettes (also the bathroom gets heat, too). Scott was great to work with, answered all my questions, and did his best to size the system correctly. Installation was smooth. There was a small hiccup where the installer accidentally broke a basement window, but Evergreen squared it away. Don and his team were great and the inspections passed. After install support has been great. Denise has been responsive to my questions. Overall, the experience was great with Evergreen and I highly recommend them."
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+9

Response time5 hrs
Response rate100%
2 neighbors recently requested a quote
Avatar for Day & Nite Plumbing & Heating, Inc.
Day & Nite Plumbing & Heating, Inc.
4.3(
225
)
Geothermal Heating or Cooling System - Install

Serving Seattle, WA and surrounding areas

Approved

In business since 1954

Emergency services offered

Warranties offered

"I purchased a new Navien NPE-240A2 Tankless Water Heater and had it installed. I'm loving the new water heater. It replaces an old Noritz tankless that died just before this installation. The on-site estimate was what sold me. Ken went through all the details and answered a lot of questions from me. Zachary came out with Austin and performed the installation just like I discussed with Ken. Zachary kept me in the loop throughout the installation to ensure I was in agreement with how it was going. Zachary always had my interest at heart and ensured no corners were cut. The installation is much cleaner, and more correct than the previous tankless company did. Zachary even listened to my concern about the astectics of the exterior exhaust and quickly found an easier and cleaner looking way to address my concern. He also removed an old recirculation pump and replaced a new main house shutoff valve. The entire area was treated respectfully and left cleaner than they found it."
Outdoor Ductless Unit
Indoor Ductless Unit
Outdoor Ductless lineset and Unit
Pump System
1 neighbors recently requested a quote
Recommended by82%of homeowners
Avatar for THE JANES COMPANY, INC.
THE JANES COMPANY, INC.
5.0(
6
)
Geothermal Heating or Cooling System - Install

Serving Seattle, WA and surrounding areas

Approved

In business since 1990

Free estimates

Warranties offered

Janes Radiant Heating is family-owned and specializes in high-efficiency radiant heating systems across Western Washington. We provide emergency boiler repair services for households throughout the Puget Sound area, the Islands, and the Peninsula. With over 35 years of experience and 20,000 installations under our belt, you can trust that our radiant heating experts will work hard to get your system up and running again. \n\nWe are the state's first and largest major installer of radiant floor heat systems. Whether you need an installation in a new or remodeled home, or an upgrade to an existing system in your current home, we bring unmatched knowledge, craftsmanship, and commitment to every project.\n\nOur showroom and warehouses are located in Mukilteo, WA, and our team of factory-trained, specialized technicians is stationed throughout our service area, with the most common parts on their trucks. Our friendly service team is here, ready to take care of you!

Boiler installation
Bellingham Boiler Upgrade
23 neighbors recently requested a quote
Avatar for AAA Heating & Air Conditioning
AAA Heating & Air Conditioning
4.8(
237
)
Geothermal Heating or Cooling System - Install

Serving Seattle, WA and surrounding areas

In business since 1989

Free estimates

Emergency services offered

"I have used AAA Heating and Cooling for many years. Colby has come out to my house on a number of occasions. He is always on time, friendly and professional. He is informative but doesn't try to sell me things I don't need."
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Our Service Center
Response time1 day
4 neighbors recently requested a quote
Recommended by96%of homeowners
Avatar for SOS Crawl Space Insulation
SOS Crawl Space Insulation
4.8(
77
)
Geothermal Heating or Cooling System - Install

Serving Seattle, WA and surrounding areas

In business since 2011

Emergency services offered

"In June of this year I contracted with a large company to install a new heat pump at our residence.  While overall I felt they did a fairly decent job there were at least three instances of inconsistent service, attention to detail and disappointment.  The most disappointing aspect of that company's performance was when it came time to "test" my existing insulation and duct work.  I believed there bid to correct my existing ducts and insulation was outrageous.  That said, I was in between a rock and a hard place.  I had just installed a $12K heat pump and I feared any efficiencies I may have gained could be lost due to my existing ducts and insulation.
I contacted 5 companies to provide me with bids, in addition to the upsell price I was previously provided by the company I had install the heat pump.  All five companies are listed on Angie's List.  They all provided fairly consistent bids.  They all helped educate me on what I may need to resolve my existing duct and insulation issues.
Daniel was the final contractor I spoke with.  He showed up early afternoon, looking a bit haggard, as if he had just emerged from a crawlspace - he had.  I was somewhat tentative at first, but I knew I had found the right man for the job the minute he began outlying in detail everything he saw, what he would recommend, how he would address my specific issues and what it would cost.  He was upfront from the get go, wanting to work with my budget and my timetable.  
Daniel and his team showed up three days later and worked 12 hours on a Saturday in 85 degree heat, completely insulating the crawlspace of a 2,000 sf home.  He was back the next day to finish up, working another 7 hours, again in 85 degree heat.  He pointed out certain issues he found along the way, specifically some holes that needed patching with mesh and sealing all gaps in my flooring from the crawlspace.  He sealed all the ducts, adding screws where necessary.  He even sealed the holes drilled by the company who installed the heat pump (one example of their service inconsistency).
Daniel is an extremely hard worker.  I have the utmost respect for his abilities and would recommend him to anyone looking to have any type of crawlspace / insulation work done.  Sure, shop around, talk to the various companies on Angies List, get educated and then do what I did, call Daniel last, negotiate a price and get the job done right.


"
hard workers
after
after
Recommended by100%of homeowners
Avatar for Home Comfort Alliance
Home Comfort Alliance
4.7(
341
)
Geothermal Heating or Cooling System - Install

Serving Seattle, WA and surrounding areas

In business since 1977

Free estimates

Emergency services offered

"Everything went well and smooth with their help. I got the proposal with all details at the same day when they came to do the estimate. Our old furnace was built on 1971, and it was in a closet next to the water heater tank. When one other company came to estimate, they wanted to cut a furnace size hole on the wall facing the hallway to fit the machine and we have to find a constructor or handy man to finish, like to build a door or make it look good, but G&S figured out an easy way, which is to turn the machine toward another direction and eventually only cut a vent on the wall. It took two days for all the installation, and they cleaned up when they left and everything looked clean and nice. They also listened to customers. We didn't want the heat pump to be right next to the stairs of our deck, so they chose a spot which was few feet away from the closest spot without any question. We appreciate for that, since the wind blows out from heat pump is kind of strong, and we feel comfortable with where it is at now. One thing I really like is they were on time, and they called around 30 minutes ahead before them showed up. They also take care all the paperwork for the PUD rebate, Costco 10% shop card, and city permits, and all we do is waiting their call to arrange the time."
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+1

Response time1 day
Response rate100%
Recommended by91%of homeowners
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