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Duncan DiagnosticsHVAC contractor in Wentzville, MO

Duncan Diagnostics is an HVAC contractor in Wentzville, MO. Open 24 hours a day, 7 days a week.

Wentzville, MO0 paid placements in any rankingHow we rank

Call (636) 398-1971

Key facts

Key facts about Duncan Diagnostics
Phone(636) 398-1971
HoursOpen 24 hours, 7 days a week

Trades

Each trade shows the evidence we matched it on.

  • HVACmain tradeGoogle main category

Service area

Serves Wentzville and 11 towns within 25 miles: Lake Saint Louis, Dardenne Prairie, O'Fallon, Weldon Spring, Saint Peters, Troy, Warrenton, Chesterfield, Wildwood, Washington and Saint Charles.

Based in Wentzville, MOView on map

Opening hours

Opening hours for Duncan Diagnostics
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.

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Questions about Duncan Diagnostics

What are Duncan Diagnostics’ hours?

Duncan Diagnostics 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 Duncan Diagnostics serve?

Serves Wentzville and 11 towns within 25 miles: Lake Saint Louis, Dardenne Prairie, O'Fallon, Weldon Spring, Saint Peters, Troy, Warrenton, Chesterfield, Wildwood, Washington and Saint Charles. 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.

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