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Design Aire Heating and CoolingHVAC contractor in O'Fallon, MO

Design Aire Heating and Cooling is an HVAC contractor at 103 Church St #20, O'Fallon, MO 63366, ranked #9 of 293 HVAC contractors in O'Fallon and rated 5.0 from 775 Google reviews. Open 7 days a week.

O'Fallon, MOUpdated 0 paid placements in any rankingHow we rank

Call (636) 355-8437Website ↗

Key facts

Key facts about Design Aire Heating and Cooling
Address103 Church St #20, O'Fallon, MO 63366Get directions
Phone(636) 355-8437
Websitedesignaire.net
HoursMonday to Sunday: 8 AM – 9 PM
Google rating5.0 from 775 Google reviews

Trades

Each trade shows the evidence we matched it on.

  • HVACmain tradeGoogle main category

Service area

Serves O'Fallon and 11 towns within 25 miles: Dardenne Prairie, Saint Peters, Lake Saint Louis, Weldon Spring, Wentzville, Saint Charles, Chesterfield, Wildwood, Bridgeton, Maryland Heights and Ellisville.

Based in O'Fallon, MOView on map

Opening hours

Opening hours for Design Aire Heating and Cooling
DayHours
Monday8 AM – 9 PMevening
Tuesday8 AM – 9 PMevening
Wednesday8 AM – 9 PMevening
Thursday8 AM – 9 PMevening
Friday8 AM – 9 PMevening
Saturday8 AM – 9 PMevening
Sunday8 AM – 9 PMevening
  • Open evenings (after 6 PM)
  • Open Saturdays
  • Open Sundays

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

Design Aire Heating and Cooling compared with nearby businesses
BusinessRankCR ScoreGoogle ratingLicense verifiedSaturdaySundayDistance away
Design Aire Heating and Cooling (this business)—645.0 (775)—YesYes
Chesterfield Service#7644.9 (4,286)—YesYes11.1 mi
Air Comfort Service Inc.#8645.0 (1,159)—YesYes7.1 mi
B & B Heating & Cooling#10645.0 (1,348)—YesYes9.5 mi

See all 293 ranked HVAC contractors in O'Fallon

Reviews

ContractorsRanked reviews

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Google

5.0from 775 Google reviews

Hired Design Aire Heating and Cooling? Write a review

Questions about Design Aire Heating and Cooling

How is Design Aire Heating and Cooling ranked in O'Fallon?

Design Aire Heating and Cooling is ranked #9 of 293 HVAC contractors in O'Fallon by CR Score, with 64 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 Design Aire Heating and Cooling’s hours?

Design Aire Heating and Cooling is open 7 days a week. Its listed hours are Monday to Sunday, 8 AM – 9 PM. On Saturdays it is open 8 AM to 9 PM, and on Sundays 8 AM to 9 PM. Hours come from the business listing; holiday hours may differ.

What areas does Design Aire Heating and Cooling serve?

Serves O'Fallon and 11 towns within 25 miles: Dardenne Prairie, Saint Peters, Lake Saint Louis, Weldon Spring, Wentzville, Saint Charles, Chesterfield, Wildwood, Bridgeton, Maryland Heights and Ellisville. 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 Design Aire Heating and Cooling?

Design Aire Heating and Cooling has a rating of 5.0 from 775 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 Design Aire Heating and Cooling?

Call Design Aire Heating and Cooling on (636) 355-8437. The business is at 103 Church St #20, O'Fallon, MO 63366. Its website is linked in the key facts on this page. Ask for a written estimate before any work starts.

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