Furnace Installation & Replacement in Lake Stevens, WA

Quick answer: Replace your furnace when it is about 15 years or older, needs a major part like a heat exchanger, or keeps breaking down. Altitude Heating & Cooling sizes each new furnace for your home, gives you options at different price points and offers financing. Call 425-201-1998.

Furnace Installation from Altitude Heating & Cooling keeps your Lake Stevens home warm with expert furnace service and replacement.

Two-fan heat pump outdoor unit on a pad beside a brick wall

Heat pump outdoor unit on a rooftop deck

Furnace installed next to water heaters in a utility room

Air handler with ductwork installed in a garage

Air handler installed in an unfinished basement

High-efficiency gas furnace with PVC venting in a garage

New outdoor AC condenser on a concrete pad beside white siding

Furnace Installation in Lake Stevens, WA

Furnace installation from Altitude Heating & Cooling helps keep your Lake Stevens home warm, efficient, and comfortable through Pacific Northwest winters. Whether you are replacing an aging furnace, upgrading to a more efficient system, or installing heating equipment for a new space, our team provides professional guidance and dependable installation from start to finish.

A properly installed furnace can improve comfort, reduce energy waste, and help your home stay reliably warm when temperatures drop. We take the time to assess your home, review your heating needs, explain your options, and install your new system with care so you can feel confident in your investment.

    
 
 
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   Kari McPhail 
 
 
 
 Trustindex verifies that the original source of the review is Google. They did a wonderful job replacing our AC unit! Wonderful price and service!
  
 
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   Ted Granston 
 
 
 
 Trustindex verifies that the original source of the review is Google. Quick, professional service!  Highly recommend!
  
 
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   E.J Martin 
 
 
 
 Trustindex verifies that the original source of the review is Google. We highly recommend Altitude Heating & Cooling for HVAC systems.
Justuce and Dylan replaced our 26 year old, 2 HVAC systems in March, 2026 .
It was a wonderful experience that we had with them. They were dedicated, attention to details and especially, they care for their customers.

Here’s an example.
We had a clothes dryer vent that directly blew out to heat pumps and had to clean up occasionally for years. They bought a vent and flex hose for the new location and its perfect location. They didn’t charge for the materials and labor, and it was a surprise gift for us.

It was an example of how they care about their customers and take pride in their work.
The HVAC systems are expensive. They gave us 3 options to work within our budget to find the right fit for us.
I hope this review helps you decide to hire this company to install your house systems. We’re lucky to have Justuce and Dylan.
Nice work Gentlemen!
  
 
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   linda boysen 
 
 
 
 Trustindex verifies that the original source of the review is Google. Great service! Will definitely use them again
  
 
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   Meaghan Dee 
 
 
 
 Trustindex verifies that the original source of the review is Google. They were very quick and efficient! My job had some duct work, a little bit of roofing, and a little bit of electrical, and they were able to do it all. I am a happy customer.
  
 
      Posted on Google  
   
   Susanna Mantis 
 
 
 
 Trustindex verifies that the original source of the review is Google. Justus and Dylan were kind, considerate and helped fix my heat splits. I felt I understand the systems now. Thank you!!

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Discover the Benefits of Professional Furnace Installation

Professional furnace installation plays a major role in how safely, efficiently, and reliably your heating system performs. When your furnace is properly selected and installed, it can provide more consistent warmth, better energy efficiency, and fewer comfort issues during the coldest months of the year.

At Altitude Heating & Cooling, we strive to deliver top-notch HVAC solutions that prioritize your comfort and satisfaction. Our goal is to build lasting relationships through exceptional service, reliable installations, and honest communication. Together, we can help create a cozy and efficient home environment.

Frequently Asked Questions

When should I consider furnace installation for my Snohomish County home?

You may want to consider furnace installation if your current system is old, unreliable, inefficient, or frequently needing repairs. In Snohomish County, a properly installed furnace helps keep your home comfortable through the cool, damp Pacific Northwest heating season.

What size furnace do I need for a home in Lake Stevens or Snohomish?

The right furnace size depends on your home’s square footage, insulation, layout, windows, ductwork, and heating needs. Altitude Heating & Cooling can evaluate your Lake Stevens or Snohomish-area home and recommend a furnace installation option that fits your comfort needs.

Is furnace installation a good option for older PNW homes?

Yes, furnace installation can be a good option for older PNW homes, especially if the existing heating system is inefficient or struggling to keep up. A new furnace can improve comfort, airflow, and heating reliability during the cooler months.

Do you install furnaces in Monroe, Everett, Marysville, and Granite Falls?

Yes, Altitude Heating & Cooling provides furnace installation in Monroe, Everett, Marysville, Granite Falls, Lake Stevens, Snohomish, and surrounding Snohomish County communities.

Signs it is time for a new furnace

The furnace is about 15 years old or older.
It needs a major part, such as a heat exchanger.
You have needed more than one repair in the last two years.
Heating bills keep climbing while your habits stay the same.
Some rooms are always cold no matter what the thermostat says.
You see rust, soot or a yellow burner flame.

What to expect from a furnace installation

We start with a load calculation to size the furnace for your home, not a guess based on the old unit. We check your ductwork, venting and gas line, then give you options at different price points, such as single-stage and two-stage furnaces, and look at whether a heat pump or dual-fuel system makes more sense.

You get the full price before any work starts, and financing is available on new systems. On install day we remove the old unit, install the new furnace cleanly, run a full startup test and walk you through how it works.

Furnace installation across Snohomish County

Altitude Heating & Cooling installs and replaces gas and electric furnaces and dual-fuel systems in Lake Stevens, Snohomish, Everett, Marysville, Granite Falls, Monroe, Lynnwood, Mukilteo, Bothell, Mill Creek, Arlington, Lochsloy and Clearview.

Furnace installation questions

How long does a furnace last?

Most furnaces last roughly 15 to 20 years. Regular maintenance helps yours reach the high end of that range.

What size furnace do I need?

It depends on your home, not just its square footage. We do a load calculation that looks at insulation, windows, layout and ductwork, so the furnace is not too big or too small.

Single-stage vs two-stage?

A single-stage furnace runs at full power every time it turns on. A two-stage furnace runs on a lower setting most of the time, which is quieter and keeps temperatures more even, and switches to full power on the coldest days.

Do you offer financing?

Yes. Financing is available on new furnaces and other new systems. Ask for details when you get your estimate.

Should I replace my furnace with a heat pump?

For many Snohomish County homes, yes. A heat pump heats and cools with one system. A dual-fuel setup keeps a furnace as backup for the coldest days, and we compare both options for your home during the estimate.