Furnaces

Woman cooling down with a bottle of water.

Foss Heating & Cooling is the leading HVAC company in Mount Vernon, WA, for your furnace service needs. We service and repair all makes and models. If you need furnace service, we are the company to call. Our skilled technicians are qualified to solve just about any repair or installation that you throw at us.

Furnace Repair

Don’t get left in the cold! Is your furnace acting up, blowing cold air, or making too much noise? Our experienced team of professionals is here to keep your home warm and cozy. We repair all makes and models, and we will never try to sell you a service that you don’t need. Our technicians are honest and hard working, and we’re always transparent and fair about the work we do.

Furnace Replacement

Sometimes a repair is not sufficient to fix your furnace. Sometimes a new furnace is the most cost-effective and energy-efficient way to go. We will always be honest with you about a possible furnace replacement. We value our time and your money––we don’t want to perform repairs or service on an appliance that is in need of replacement.

If you do need a furnace replacement, we know how overwhelming it can be. Here are some of the frequently asked questions about furnaces that we get from some of our Mount Vernon, WA residents:

What Are The Different Types Of Furnaces?

Single Stage: A single-stage furnace has only one stage of operation. It can either be turned on or turned off.

Two Stage: A two-stage furnace has two settings––full and half speed. This is a more efficient way to heat and provides for better comfort, because it can move the air at a slower pace.

Variable Stage or Modulating: A variable-stage or modulating furnace modulates the speed and heat output based on the temperature outside and the desired comfort level. This furnace only works as much as you need it, making this type the most energy-efficient type of furnace.

What Is AFUE?

AFUE, or Annualized Fuel Utilization Efficiency, is a measure of furnace-heating efficiency. The higher the AFUE, the more efficient the furnace.

What Size Furnace Do I Need?

We can calculate the correct size furnace for your home. The number of BTUs, or British Thermal Units, needed to heat your home is dependent on a number of variables. Contrary to what you might think, a bigger furnace may not necessarily mean more heating power for your home. Call us at Foss Heating & Cooling, and we can set up an appointment to calculate the furnace size you might need.

Need Furnace Service?

Contact the experts at Foss Heating & Cooling.

Call us at 360-336-1517!

Gas Furnace Maintenance in Mount Vernon, WA 98274

“Always do a great job. Friendly, competitent and on time.”

– James H.

Gas Furnace Maintenance in Camano Island, WA 98282

“My daughter recommended
Foss to us, she was extremely satisfied with her furnace repair. Kendra and Trevor are customer oriented, friendly and professional, a pleasure to work with. Brett , our technician was top-notched.Extremely knowledgeable, answered all my questions. We had two gas fireplaces and our furnace serviced. Everything is working beautifully. I appreciated his full diagnostic of our home's ductwork and heating capacity. I will highly recommend Foss to family, friends, and neighbors.”

– Dawn T.

Gas Furnace Maintenance in Mount Vernon, WA 92873

“Upon recently purchasing our home in late 2018, we had a few issues in the winter that prompted us to coordinate some repairs and subsequent ongoing maintenance. The furnace unit in the home had a maintenance sticker from Foss in the past, so we figured we would start there – and we are glad we did! Our experience with Andrew and the customer support from Foss has been fantastic! They corrected some existing issues for free and got us on a maintenance plan that is well worth the value it brings to our family and home. We highly recommend Foss to everyone in the area, and will continue to utilize their services for years to come!”

– Ryan J.

Gas Furnace Maintenance in Mount Vernon, WA 98273

“Brett is awesome! He was punctual, friendly, and answered all of my questions.”

– U P.

Gas Furnace Repair in Mount Vernon, WA 98274

“Andrew and Mason were extremely knowledgeable about my heating system and what was needed for maintenance. Very professional and courteous. I will be using Foss for my future heating needs.”

– Roger C.

Gas Furnace Maintenance in Mount Vernon, WA 98274

“Thanks Good service”

– Ron O.

Gas Furnace Maintenance in Sedro Woolley, WA 98284

“Friendly service, always on time, pleasure to work with every year”

– Corey C.

Gas Furnace Maintenance in Mount Vernon, WA 98274

“Andre is very efficient, friendly and polite. Always good to see him!”

– Dan A.

Gas Furnace Replacement in Burlington, WA 98233

“Great service”

– Elva W.

Gas Furnace Maintenance in La Conner, WA 98257

“Very friendly and helpful! Answered all my questions”

– Mike R.


Foss Heating & Cooling proudly provides HVAC service to Mount Vernon, Anacortes, Burlington, Bow, Camano Island, La Conner, Sedro Woolley, Stanwood, and the surrounding communities. Visit our service area page for more coverage details, call us at 360-336-1517, or request service online today.