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Furnace and Air Conditioning Repair Services in Mountlake Terrace.

Elevate your Comfort with the very best AC and Furnace Installation and repairs. We provide the Very Best Furnaces, Heat Pumps, and Air Conditioners, Specially designed for Homes and Businesses of all sizes. Have a Comfort Adviser Provide you with Our Special Prices on Installation of a Ductless Mini Splits System. 

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Electrical Services by Experts Knowing How to Power Your Home

Ensure Uninterrupted Comfort and Safety with our Top-Tier Electrical Services and Whole-House Generators. Let us Install New Lighting, Outlets, Car Charging Stations, and Electrical Panel upgrades. 

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Your Ultimate Solution For Fireplaces, Furnaces, Air Conditioners.

Transform your Home into a Warm, Cozy, and Energy Efficient Space with our Elegant Gas Fireplaces, High-Performance Gas Furnace Installations, and Eco-Friendly Heat Pump Installations—Tailored for your Year-Round Comfort. Need Ductless Mini Split Installation, for a good price and Installed correctly. Onestop is your Heating, Cooling, and Electrical Company. We serve Mountlake Terrace, WA, and surrounding areas.

  • Licensed Bonded Insured
  • Certified & Dependable
  • 100% Satisfaction Guarantee
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Elevate your Comfort with our Furnace Repair and Air Conditioning Repairs Services in Mountlake Terrace, WA

Onestop Heating Cooling and Electric LLC is your Premier provider of Affordable Residential and Commercial HVAC services in Mountlake Terrace. We Specialize in Delivering Efficient and Reliable HVAC Repairs and Installation on Air Conditioners, Heat Pumps, Furnaces, and Air Handlers in Snohomish County and King County, from Installation to Maintenance, Repairs, and Diagnostics, we are your Onestop Company for all HVAC and Electrical needs.

With a Commitment to Excellence and Customer Satisfaction, you Can Count on Us to Tailor our Residential and Commercial HVAC Repairs and Electrical Services to your needs, ensuring your home or business enjoys optimal Comfort Throughout the Years to come.

We are committed to providing Furnace Repairs and Air Conditioning Repairs at a fair price. 

Our HVAC Services in Snohomish County Are All-Inclusive

Discover our extensive range of residential HVAC installation, maintenance and repair services in Snohomish, WA, designed to enhance the comfort, safety, and efficiency of your home.
Whole-House Generators Installation
With our robust whole-house generators, you'll enjoy seamless power continuity, no matter the weather conditions.
Indoor Air Quality Installation
Enhance the health and comfort of your indoor spaces with our specialized services aimed at purifying your air.
Heat Pump Installation and Repairs
Our heat pumps deliver consistent, eco-friendly climate control, perfect for keeping your home comfortable year-round.We have the very best equipment available, From Mitsubishi Heat Pump Installation, American Standard Heat Pump Installation or even Bosch Heat Pump Installation we have you covered.  Take a look at our products page to see more options. 
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How We Work

Request your service

Request your service

Give us a Call or Fill out our Online Service Request form to set up an appointment. We’ll reach out to Finalize your Appointment and Schedule a Time for a Service Technician to Arrive at your Location. With our Office in Mountlake Terrace, we are centered around most Major Cities to get to you Quickly.

Technician Arrives

Technician Arrives

We’ll send a Technician to your Address to Assess your Concerns and Perform Repairs to your Satisfaction. 

Satisfaction Guaranteed

Satisfaction Guaranteed

Once the job is complete, We Guarantee your Full Satisfaction. We Provide Expert Solutions for any of these, AC Installation, Furnace Installation, Heat Pump Installation or Ductless Mini Split Installation. We use the best parts for Repairs and love working as a team. We are all friends at Onestop and want to make You a part of the Greatness We have Created.

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Why Choose Onestop

With our Highly Trained Service Technicians, Your Project will be taken Seriously and it will be done the Right Way! We care about Your Home and Will Show you the Respect you Deserve!


We Service All Major Brands

We service all brands and try to get your repairs done on the same day!

We are Trained and Certified for AC Repairs, Furnace Repairs, Heat Pump Repairs, and Ductless Mini Split Repairs. 


100% Satisfaction Guarantee

We Understand Customer Satisfaction. We have dedicated staff that will help resolve any issues that may arise. We take the Time to Understand our Customers and Will Earn your business.


Available 24/7

Have an Emergency No Problem 24/7, Onestop will be on the Road Ready to take Care of your System.

Locations We Serve

At Onestop Heating Cooling and Electric LLC, We're Proud to Serve many areas across Washington State, ensuring Top-Notch Residential and Commercial HVAC services in Snohomish County and King County, WA for every Home and Business.

  • Lake Stevens, WA
  • Kenmore, WA
  • Smokey Point, WA
  • Arlington, WA
  • Green Lake, WA
  • Ballard, WA
  • Bellevue, WA
  • Marysville, WA

Latest News/Blogs


Heat Pump and How They Work

A heat pump is a key component of a home's heating and cooling system, typically located outside the house. Similar to a central air conditioner, it can both cool and heat your home. During colder seasons, it extracts heat from the outdoor air and brings it indoors, while in warmer seasons, it removes heat from the inside to cool the space. Powered by electricity and utilizing refrigerants, heat pumps ensure year-round comfort without the need for separate heating systems. In colder regions, an electric heat strip can be integrated into the indoor Air Handler for enhanced heating capabilities. Unlike furnaces, heat pumps do not rely on burning fossil fuels, making them a more eco-friendly heating and cooling option.


The Power of Prevention: Why Electrical Maintenance is Key for Your Home

Welcome to the OneStop Heating Cooling Electric Blog! Today, we're diving into the crucial topic of electrical maintenance and why it's essential for your home. As a leading provider of electrical services, we understand the importance of keeping your electrical systems in top condition to ensure safety, efficiency, and peace of mind for you and your family. 

What Our Happy Customers Say

Hear directly from Our Satisfied Customers and Dy Onestop Heating Cooling  Electric LLC is the trusted choice for Residential and Commercial HVAC Services in Mountlake Terrace.

I am so pleased and thankful for OneStop. Our furnace started blowing cold air during a temperature drop and I have 3 small children. When I called, they came out right away. They diagnosed the problem and communicated what needed done and what they were going to do at every step so there was no surprises at the end. They got my furnace up and running properly and my children didn't have to sleep in a freezing cold room all night. They were such a pleasure to work with and they were so kind and professional. I will definitely be calling them in the future and have already signed up for their maintenance member program. If I could give them more than 5 stars, I would. THANK YOU ONESTOP!

Rollanda Carls

had an old ac that died and wouldn't cool I called Onestop and they were out there asap and got my ac up and running again and they went through the whole system to make sure it stayed operational. I have elderly people in my home and temperature control is key. They were very detail oriented and prompt and even gave me options for a maintenance plan to save me money in the future... totally worth it. I'll be using these guys in the near future to update this system. Five Stars for sure.


Great company to work with!! They arrived on time and did an amazing job for me. Other companies had kept putting me off and rescheduling me- it gets old. This company is a breath of fresh air. Best of all, their quote was accurate and there were no surprises wheeln payment time came. Definitely using this company again!!

Rick Gale

I usually don't leave a review, but Onestop's technician stopped by and diagnosed our heat pump and air handler. Even though they gave me a really good price on repairs, I decided to get a new heat pump and air handler with warranties.
We had their comfort advisor come out and give us a quote. Their prices were so much better than the other companies we called, and now we are glad that we chose OneStop.
The installation was so much better than what was previously done.
I'm very picky on how things look outside, and it looked very clean and professional. They also advised me not to get the louder system because it is outside our bedroom window. Everything from ONESTOP was done right, and they have an awesome maintenance member program. Thanks again

Titan Painting & Remodeling