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Top-Rated Thermostat installers and replacers in Seattle - Updated Nov 2026

Avatar for Smart Electric, Heating & Air
Smart Electric, Heating & Air
4.9(
79
)
Thermostat - Install or Replace

Serving Seattle, WA and surrounding areas

Approved

In business since 2020

Free estimates

Warranties offered

"Cory and Joe were fantastic. The installations went without a hitch. The overall cost was lower than three other quotes I had received for the job. At the beginning of the A/C install I noticed the water heater was leaking, and they were able to replace it the next day. I will definitely use them again."
13 neighbors recently requested a quote
Recommended by80%of homeowners
Avatar for Cummings, Inc.
Cummings, Inc.
4.3(
282
)
Thermostat - Install or Replace

Serving Seattle, WA and surrounding areas

Approved

In business since 2008

Free estimates

Emergency services offered

"The furnace went out just before the Thanksgiving holiday and I was expecting family over for the weekend. I contacted Cummins and they were able to come out the day after. They said they would be able to repair my furnace but indicated that it was fairly close to end of life. For the price of repair, they recommended a replacement. Since I were to replace the furnace I always wanted to have AC and they gave me a great deal on both. They were able to replace my furnace the same day and returned a couple of weeks later to install the AC unit. However, shortly after my guests left after the holiday they furnace failed. I called them to let them know it wasn't working, so they send someone out to look at it. I explained my disappointment but assured me they would make it right. They ended up replacing the circuit board and the thermostat. Even though I experienced a bit of a hiccup, they were very easy to work with and stood behind their work and product. Everyone at the company that I spoke with was very helpful and friendly. I am happy with the results thus far and would recommend them to anyone that is in the market for a furnace and/or AC unit."
Coleman Furnace
Heat Pump Replacement
Heat Pump Install
Change out a Coleman Furnace
Boiler system

+1

Response time9 hrs
Response rate97%
227 neighbors recently requested a quote
Avatar for Harts Plumbers, Electricians, & HVAC Technicians
Harts Plumbers, Electricians, & HVAC Technicians
4.6(
1,467
)
Thermostat - Install or Replace

Serving Seattle, WA and surrounding areas

Approved

Super Service Award Winner

In business since 2013

Emergency services offered

Warranties offered

"Everyone I dealt with or spoke to at this company was extremely helpful and friendly. They were thorough, informative and professional and worked to get me the best possible deal when my failed water heater turned into discovering my 97 year old house needed the original pipes replaced. Had they not done a thorough inspection when coming out for the water heater I would have never known. They were in the condition they were in. They also did everything they could to keep any cuts into wall minimal to preserve the integrity of my original plaster walls, and as an old house lover, I really appreciated that. I will definitely use them again for other plumbing needs."
Prep Area
Waterfall Finished!
Excavation jobs and more!
 install grease trap for commercial kitchen
Delivery of Shoring

+334

43 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for 217 Handyman Services
217 Handyman Services
4.9(
90
)
Thermostat - Install or Replace

Serving Seattle, WA and surrounding areas

Approved

Super Service Award Winner

In business since 2023

Free estimates

Emergency services offered

"All of my questions were courtesly answered. He was very knowledgeable regarding the installation of new joists under my deck. He was very safety conscious. The price was fair, and the work was done in the most safe and efficient manner in order too keep the cost down. They cleaned the area when they finished. I will hire them again for future work. I could not find deck repair in the project list so I entered sunroom and patio repair since I had to enter something."
Handyman Services Project
Pergola assembly
RV Cover
New paint andvreoairs
After remediation

+70

Response time4 days
2 neighbors recently requested a quote
Recommended by52%of homeowners
Avatar for Northwest Expert Heating, LLC
Northwest Expert Heating, LLC
4.2(
41
)
Thermostat - Install or Replace

Serving Seattle, WA and surrounding areas

Approved

In business since 2017

Free estimates

Emergency services offered

"Northwest expert was outstanding and delivered on the Tune-Up on my central HVAC just as they did on the installation 2 years ago. Virgil was thorough and professional!"
COLEMAN 14 SEER Air Conditioner
Outdoor Unit
TRANE XV 80
In the Process of Installing Ac
9k indoor unit

+22

Response time11 hrs
159 neighbors recently requested a quote
Recommended by50%of homeowners
Avatar for Fred's Electric
Fred's Electric
5.0(
13
)
Thermostat - Install or Replace

Serving Seattle, WA and surrounding areas

Approved

In business since 2024

Free estimates

Emergency services offered

"Steve did an amazing job, was stressed about the delicate wood where the electrical box had to be cut and then the fan installed but Steve did it perfect. Thank you again for everything."
Caracol Apartments
Sunrise Terrace Apts
Sunrise Terrace Apts
Sunrise Terrace Apts
Response time12 hrs
16 neighbors recently requested a quote
Avatar for Jack of All Trades
Jack of All Trades
4.7(
201
)
Thermostat - Install or Replace

Serving Seattle, WA and surrounding areas

Approved

In business since 2009

Warranties offered

Customers say: Super punctual

"I believe I was the first Angie's List member to post a review on Jack of All Trades, a few years ago now. Since then he is my go-to guy whenever I need anything done in my home and I have called upon his services several times. The first time Jack came to my home was to look at a door that needed to be installed, a job two other handymen/contractors had declined because it was beyond their skills. Jack's response then was "There's always a way." That sold me.
On this last visit, Jack and Ethan knocked several things off my list all in one day. Some of the tasks were things I might have been able to do myself, but they're so much quicker and better at it. I had built a cover for the crawl space access, but the plywood I used wasn't lasting long. Jack picked up a sheet of marine plywood, which should last longer in our wet weather. They had it constructed in short order and had time to put two coats of paint on it. Jack also took the initiative to add two handles which will make it much easier for me to deal with. I appreciate things like that about Jack. He's always thinking.
The ceiling exhaust fan in the kitchen was probably the original one installed when the house was built in 1954. It didn't do much for removing smoke or steam. I purchased a new replacement fan, with the idea of having Jack swap them out, but I was disappointed I couldn't find anything close to my old retro-looking fan with the metal grate. After climbing to the roof and into the attic to check out how the old fan was installed, Jack determined it might be easier to rework the old fan since it fit into the ductwork so well, and to clean the filter at the roof level. Cleaning the filter alone made a big difference and another contractor might have stopped there. But Jack and Ethan disassembled the old fan, discovering some frayed electrical something-or-other and did not advise reinstalling it as is. So they took apart the new fan I'd purchased, using the motor and fan blades from the new and the mounting rack from the old and they were in business. This also meant they could re-use the retro grate. I was a very happy camper.
Between the two of them they completed all the tasks in six hours, including the deck cleaning, hauling, door fixing and painting, working in tandem and separately as needed. I've always been impressed with Jack, and am impressed with his right-hand man, Ethan, as well. Both are quick workers, very friendly and professional. They take extra care to clean up after they're done working, leaving things cleaner than when they started. They know a lot about how to do a lot of things, and on the few occasions they can't do it themselves, will research to see who can. Such as replacing a wobbly wooden handrail on the front steps. When I mentioned that I would really prefer a wrought iron one, Jack said he knew where he could get some standard ones, but remembered that Ethan knows someone who does custom, more artsy iron work. So we'll check that out. Someone else might have just tried to sell me on the work to replace the existing wooden handrail.
I love dealing with people who actually listen to their clients, don't mind spending a few minutes getting to know them so they can better serve their needs, and think outside of the box. I've always found Jack of All Trades to do honest, thoughtful work for a fair price. I have no hesitation trusting Jack and Ethan, and know they will always come through with flying colors.
I highly recommend Jack of All Trades!
"
1 neighbors recently requested a quote
Recommended by98%of homeowners
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FAQs for thermostat installation and replacement projects in Seattle, WA

Smart thermostats may be worth it for many homeowners. They come with various features, including voice control and smartphone apps. Vacation mode can help lower energy usage when you’re out of town for an extended period. Alert warnings let you know about major spikes or drops in temperature. Smartphone apps can track energy usage, and smart thermostats can learn your routine over time to adjust your temperature and reduce wasted energy consumption automatically.

You typically do not need more than one smart thermostat. While it’s common to see multiple mechanical thermostats throughout a large home, multiple smart thermostats may try to override each other. This can lead to problems with the HVAC system. Ensure the unit you buy has the option for dual- or multi-zoned systems to avoid compatibility issues.

Installing a programmable or smart thermostat may save you $180 per year in utility costs. A big part of this comes from a smart thermostat’s ability to learn and adapt to your regular routines. With smartphone apps or web-based interfaces, you also have the option to control your thermostat when you’re not home.

The Seattle, WA homeowners’ guide to thermostat installations and replacements

From average costs to expert advice, get all the answers you need to get your job done.