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Harster Heating & Air ConditioningHVAC contractor in St. Louis, MO

Harster Heating & Air Conditioning is an HVAC contractor at 9900 Gravois Rd, St. Louis, MO 63123, ranked #49 of 438 HVAC contractors in St. Louis and rated 4.5 from 77 Google reviews. Open 24 hours a day, 7 days a week.

St. Louis, MOUpdated 0 paid placements in any rankingHow we rank

Call (314) 631-5300Website ↗

Key facts

Key facts about Harster Heating & Air Conditioning
Address9900 Gravois Rd, St. Louis, MO 63123Get directions
Phone(314) 631-5300
Websiteharsterheating.com
HoursOpen 24 hours, 7 days a week
Google rating4.5 from 77 Google reviews

Trades

Each trade shows the evidence we matched it on.

  • HVACmain tradeGoogle main category

Service area

Serves St. Louis and 12 towns within 25 miles: Affton, Concord, Shrewsbury, Crestwood, Sappington, Mehlville, Lemay, Webster Groves, Glendale, Sunset Hills, Maplewood and Brentwood.

Based in St. Louis, MOView on map

Opening hours

Opening hours for Harster Heating & Air Conditioning
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

Harster Heating & Air Conditioning compared with nearby businesses
BusinessRankCR ScoreGoogle ratingLicense verifiedSaturdaySundayDistance away
Harster Heating & Air Conditioning (this business)—604.5 (77)—YesYes
Arch Air Services#47604.9 (303)—YesYes12.7 mi
Air Comfort Service Inc.#48605.0 (1,159)—YesYes20.0 mi
Aire Serv of St. Louis#50604.9 (221)—YesYes4.6 mi

See all 438 ranked HVAC contractors in St. Louis

Reviews

ContractorsRanked reviews

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Google

4.5from 77 Google reviews

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Questions about Harster Heating & Air Conditioning

How is Harster Heating & Air Conditioning ranked in St. Louis?

Harster Heating & Air Conditioning is ranked #49 of 438 HVAC contractors in St. Louis by CR Score, with 60 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 Harster Heating & Air Conditioning’s hours?

Harster Heating & Air Conditioning 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 Harster Heating & Air Conditioning serve?

Serves St. Louis and 12 towns within 25 miles: Affton, Concord, Shrewsbury, Crestwood, Sappington, Mehlville, Lemay, Webster Groves, Glendale, Sunset Hills, Maplewood and Brentwood. 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 Harster Heating & Air Conditioning?

Harster Heating & Air Conditioning has a rating of 4.5 from 77 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 Harster Heating & Air Conditioning?

Call Harster Heating & Air Conditioning on (314) 631-5300. The business is at 9900 Gravois Rd, St. Louis, MO 63123. Its website is linked in the key facts on this page. Ask for a written estimate before any work starts.

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