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Foss Heating & CoolingHVAC contractor in Mount Vernon, WA

Foss Heating & Cooling is an HVAC contractor at 4101 Old Hwy 99 South Rd, Mount Vernon, WA 98273, ranked #2 of 65 HVAC contractors in Mount Vernon and rated 4.9 from 914 Google reviews. Open 24 hours a day, 7 days a week.

Mount Vernon, WAUpdated 0 paid placements in any rankingHow we rank

Call (360) 336-1517Website ↗

Key facts

Key facts about Foss Heating & Cooling
Address4101 Old Hwy 99 South Rd, Mount Vernon, WA 98273Get directions
Phone(360) 336-1517
Websitefossheating.com
HoursOpen 24 hours, 7 days a week
Google rating4.9 from 914 Google reviews

Trades

Each trade shows the evidence we matched it on.

  • HVACmain tradeGoogle main category

Service area

Serves Mount Vernon and 10 towns within 25 miles: Burlington, Sedro-Woolley, Stanwood, Anacortes, Oak Harbor, Arlington, Camano, Tulalip, Sudden Valley and Marysville.

Based in Mount Vernon, WAView on map

Opening hours

Opening hours for Foss Heating & Cooling
DayHours
MondayOpen 24 hours
TuesdayOpen 24 hours
WednesdayOpen 24 hours
ThursdayOpen 24 hours
FridayOpen 24 hours
SaturdayOpen 24 hours
SundayOpen 24 hours
  • Open 24/7
  • Open evenings — no
  • Open Saturdays
  • Open Sundays
  • Emergency service

Typical heating and cooling prices

Typical heating and cooling prices
JobLowTypicalHigh
AC replacementPer system, installed (unit plus labor); typical range of customer-reported jobs. US national range$3,887$5,978$8,073
Furnace replacementPer system, installed; typical range of customer-reported jobs. US national range$2,823$4,814$6,896

Market ranges for the trade, checked October 2026, not a quote from this business. Ask for a written estimate.

Compare nearby HVAC contractors

Foss Heating & Cooling compared with nearby businesses
BusinessRankCR ScoreGoogle ratingLicense verifiedSaturdaySundayDistance away
Foss Heating & Cooling (this business)—664.9 (914)—YesYes
CM Heating#1675.0 (1,208)—YesYes3.5 mi
Ronk Brothers Heating, Cooling, and Electrical#3644.9 (841)—YesYes9.2 mi
CPI Plumbing & Heating#4644.8 (2,955)—YesYes1.3 mi

See all 65 ranked HVAC contractors in Mount Vernon

Reviews

ContractorsRanked reviews

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Google

4.9from 914 Google reviews

Hired Foss Heating & Cooling? Write a review

Questions about Foss Heating & Cooling

How is Foss Heating & Cooling ranked in Mount Vernon?

Foss Heating & Cooling is ranked #2 of 65 HVAC contractors in Mount Vernon by CR Score, with 66 out of 100 as of October 2026. The score weighs reputation, credentials, review volume, recency, availability, trade focus, proximity, claimed profile, partnered and ContractorsRanked reviews. No business can pay to change its rank.

What are Foss Heating & Cooling’s hours?

Foss Heating & Cooling is open 24 hours a day, 7 days a week. Its listed hours are Open 24 hours, 7 days a week. On Saturdays it is open Open 24 hours, and on Sundays Open 24 hours. Hours come from the business listing; holiday hours may differ.

What areas does Foss Heating & Cooling serve?

Serves Mount Vernon and 10 towns within 25 miles: Burlington, Sedro-Woolley, Stanwood, Anacortes, Oak Harbor, Arlington, Camano, Tulalip, Sudden Valley and Marysville. The list is based on the business's location and the usual service radius for heating and cooling. Confirm your address is covered when you call.

What do Google reviews say about Foss Heating & Cooling?

Foss Heating & Cooling has a rating of 4.9 from 914 Google reviews. The CR Score adjusts the star rating for review count, so a high rating from a few reviews counts for less than the same rating from many.

How do I contact Foss Heating & Cooling?

Call Foss Heating & Cooling on (360) 336-1517. The business is at 4101 Old Hwy 99 South Rd, Mount Vernon, WA 98273. Its website is linked in the key facts on this page. Ask for a written estimate before any work starts.

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