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Sierra MechanicalHVAC contractor in O'Fallon, MO

Sierra Mechanical is an HVAC contractor at 212 Crafton Dr, O'Fallon, MO 63366, rated 3.2 from 185 Google reviews. Open Monday to Friday.

O'Fallon, MO0 paid placements in any rankingHow we rank

Call (636) 240-8383Website ↗

Key facts

Key facts about Sierra Mechanical
Address212 Crafton Dr, O'Fallon, MO 63366Get directions
Phone(636) 240-8383
Websiteprofile.guide
HoursMonday to Thursday: 8 AM – midnight; Friday: 8 AM – 4:30 PM
Google rating3.2 from 185 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: Lake Saint Louis, Dardenne Prairie, Wentzville, Saint Peters, Weldon Spring, Chesterfield, Saint Charles, Wildwood, Ellisville, Troy and Ballwin.

Based in O'Fallon, MOView on map

Opening hours

Opening hours for Sierra Mechanical
DayHours
Monday8 AM – midnightevening
Tuesday8 AM – midnightevening
Wednesday8 AM – midnightevening
Thursday8 AM – midnightevening
Friday8 AM – 4:30 PM
SaturdayClosed
SundayClosed
  • Open evenings (after 6 PM)
  • Open Saturdays — no
  • Open Sundays — no

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.

Reviews

ContractorsRanked reviews

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Google

3.2from 185 Google reviews

Hired Sierra Mechanical? Write a review

Questions about Sierra Mechanical

What are Sierra Mechanical’s hours?

Sierra Mechanical is open Monday to Friday. Its listed hours are Monday to Thursday, 8 AM – midnight; Friday, 8 AM – 4:30 PM. It is closed on Saturdays and closed on Sundays. Hours come from the business listing; holiday hours may differ.

What areas does Sierra Mechanical serve?

Serves O'Fallon and 11 towns within 25 miles: Lake Saint Louis, Dardenne Prairie, Wentzville, Saint Peters, Weldon Spring, Chesterfield, Saint Charles, Wildwood, Ellisville, Troy and Ballwin. 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 Sierra Mechanical?

Sierra Mechanical has a rating of 3.2 from 185 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 Sierra Mechanical?

Call Sierra Mechanical on (636) 240-8383. The business is at 212 Crafton Dr, 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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