Foss Heating Cooling
Foss Heating Cooling is a HVAC provider serving Mount Vernon, WA. Rated 4.9★ with 934 Google reviews. See services, review signals, and request a quote.
HVACMount Vernon, WAEmergency serviceFinancing available
On this page
Company overview
- TradeHVAC
- Service areaMount Vernon, WA
- Google rating4.9★ (934 reviews)
- Years in business52+
- Phone(360) 336-1517
- Address4101 Old Hwy 99 South Rd, Mount Vernon, WA 98273, USA
- L&I LicenseFOSSHCI9858A (ACTIVE)
Services offered
- furnace installation
- furnace repair
- heat pump installation
- heat pump repair
- ac installation
- ac repair
- ductless mini split
- indoor air quality
- thermostat installation
- boiler service
- maintenance plans
- commercial hvac
- geothermal
- electrical
Photos
What customers say
“I have dealt with Foss Heating for 21 years. Didn’t even price shop. Wouldn’t use anyone else. Knowledgeable; professional; polite; prompt; flexible. They did great work at my convenience and I am SO…”
“We replaced our 30 year old gas furnace and the whole team from sales through installation and system start up were fantastic. Competitive price, and exceptional service. Great communication and profe…”
“Foss performed an overhaul of our HVAC system, and we couldn’t be happier. The quality was top notch, service afterwards was immediate and efficient, and everyone was professional. Their pricing was f…”
“I used Foss to get a second opinion on our aged, broken furnace, and I am very glad that I did. Brett was very professional and he was able to diagnose the issue very quickly. Total repair cost was le…”
“Andre at Foss Came to our rescue with very little notice during a cold week in February. I was at work at the time and my wife was not confident to deal with the situation, but he did a great job of c…”
Key highlights
Strengths
- Highly rated (4.9★ average)
- Large review volume (934 reviews)
- Established business (52+ years)
- Emergency/same-day service available
- Financing options available
Things to ask
- Confirm availability for your area and timeline
- Ask about warranty terms on parts and labor
- Request a written estimate before work begins
Explore nearby research
Frequently Asked Questions
What services does Foss Heating Cooling offer?
Foss Heating Cooling provides: furnace installation, furnace repair, heat pump installation, heat pump repair, ac installation, ac repair, ductless mini split, indoor air quality, thermostat installation, boiler service, maintenance plans, commercial hvac, geothermal, electrical. They serve residential and commercial customers in Mount Vernon, WA.
What is Foss Heating Cooling's rating?
Foss Heating Cooling has a 4.9 out of 5 star rating based on 934 Google reviews.
Is this company licensed in Washington?
Yes. License number: FOSSHCI9858A. Status: ACTIVE. You can verify on the Washington Department of Labor & Industries (L&I) lookup at https://secure.lni.wa.gov/verify.
Does Foss Heating Cooling offer emergency service?
Yes. Foss Heating Cooling offers emergency HVAC service.
How do I request a quote?
Use the CTA below to submit your ZIP. You can message this company alongside two or three other local pros for easy comparison.
Licensing verified 2026-04-21. Reviews refreshed 2026-04-21.
Licensing data: Washington Department of Labor & Industries (L&I) · Company data: verified business records + Google Business profile
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