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Emergency HVAC Contractors in Warrenton, MO (2026)

Top 50 of 85 HVAC contractors, in emergency orderUpdated 0 paid placements in this rankingHow we rank

25 of the 50 HVAC contractors on this list post 24/7 hours. 24/7 businesses come first, then same-day, each ranked by CR Score with availability weighted higher.

If you smell gas, leave the building now and call your gas utility or 911 from outside.

The short answer

  1. 1

    #1 for emergency heating and cooling in Warrenton: Schraer Heating & Air Conditioning, open 24/7.

Rankings can't be bought. Contractors can't pay to change their rank or score. How we rank

Top emergency HVAC contractors in Warrenton at a glance

Top emergency HVAC contractors in Warrenton at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Schraer Heating & Air Conditioning654.7★ (390)Warrenton24/7
2Hoock's Heating & Cooling655.0★ (768)O'Fallon, 10 mi away24/7
3Level 9 Heating Cooling Plumbing624.9★ (1,254)Washington, 20 mi away24/7
4Elite Heating and Cooling625.0★ (476)Wentzville, 16 mi away24/7
5Renaud Brothers Heating & Cooling625.0★ (609)Wentzville, 18 mi away24/7
6AAA Heating & Cooling625.0★ (413)Wentzville, 16 mi away24/7
7Stay Cool Climate Control625.0★ (1,068)O'Fallon, 24 mi away24/7
8MCF Mechanical615.0★ (22)Warrenton24/7
9Hosack Plumbing, Heating & Cooling615.0★ (696)O'Fallon, 24 mi away24/7
10Swiss, LLC614.9★ (924)O'Fallon, 24 mi away24/7

Call an emergency HVAC contractor in Warrenton now

24/7 hours mean the business says its phone is answered around the clock. Arrival time depends on where the crew is. Ask for an arrival window when you call.

The 50 emergency HVAC contractors in Warrenton, ranked

24/7 first, then same-day service, then the rest. Each group is in CR Score order on emergency weights. The full ranking of all 85 is on the HVAC contractors page.

Scores below: based on 8 of 10 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

  6. #6 AAA Heating & Cooling

    Based in Wentzville, 16 mi away

    62/100CR Score

    Ranked #6 because of its Google rating and trade focus: 5.0★ from 413 Google reviews, listed on Google as “Air conditioning contractor”.

    • 5.0★ from 413 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    407 E Pearce Blvd Ste A, Wentzville, MO 63385
    View profile for AAA Heating & Cooling(636) 278-9616

  8. #8 MCF Mechanical

    Based in Warrenton

    61/100CR Score

    Ranked #8 because of its Google rating and trade focus: 5.0★ from 22 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 22 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1009 Armory Rd Suite 108, Warrenton, MO 63383
    View profile for MCF Mechanical(636) 459-5382

  10. #10 Swiss, LLC

    Based in O'Fallon, 24 mi away

    61/100CR Score

    Ranked #10 because of its Google rating and trade focus: 4.9★ from 924 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 924 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    406 E Wabash St, O'Fallon, MO 63366
    View profile for Swiss, LLC(636) 542-8739

  11. #11 Air Rescue

    Based in Warrenton

    60/100CR Score

    Ranked #11 because of its Google rating and trade focus: 5.0★ from 10 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 10 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for Air Rescue(314) 732-0555

Top 50 of 85 HVAC contractors by emergency score

#1 to #25 are shown in full above. Here are #26 to #50, in CR Score order; each links to its profile.

HVAC contractors in Warrenton, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Tune Heating and Cooling LLC474.9★ (73)25 mi
27J and E Heating and Cooling464.4★ (5)10 mi
28Canada HVAC LLC465.0★ (23)21 mi
29Superior Service455.0★ (2,219)19 mi
30Survant Heating & Air Conditioning454.7★ (203)In Warrenton
31Michelson's Plumbing & Heating444.0★ (5)In Warrenton
32Hoff Heating & AC444.9★ (1,490)21 mi
33The Air Guys434.2★ (5)20 mi
34Design Aire Heating and Cooling425.0★ (775)24 mi
35Chowning Heating and Cooling424.8★ (399)17 mi
36Crystal Heating & Cooling424.9★ (497)20 mi
37Phoenix Services LLC424.8★ (18)In Warrenton
38ABLE, LLC425.0★ (137)15 mi
39Rick's Heating & Air Conditioning424.6★ (18)In Warrenton
40Rob's Heating and Cooling424.3★ (24)In Warrenton
41AAA Home Services424.7★ (834)23 mi
42A Precision Air Heating & Cooling415.0★ (3)23 mi
43Goldkamp Heating and Cooling | Lake St. Louis415.0★ (230)20 mi
44Complete Maintenance & Repair Service Inc.414.0★ (4)24 mi
45Revolution Heating & Cooling415.0★ (10)In Warrenton
46ILLY HVAC415.0★ (154)19 mi
47Evans Heating and Air Conditioning405.0★ (45)15 mi
48Crabtree Heating & Cooling404.7★ (24)10 mi
49Peters Heating and Air Conditioning404.6★ (65)14 mi
50Evans Services, LLC405.0★ (4)In Warrenton

How we ranked emergency HVAC contractors in Warrenton

Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 HVAC contractors are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.

Paid placement never changes a rank or score. Featured businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.

Read the full method: formula, sources and exclusions

CR Score factors and weights
FactorWeightComputed from
Reputation15%Google star rating, adjusted for how many reviews back it
Credentials15%Active state license, bond and workers’ comp on file
Review volume10%Number of Google reviews, compared with the most-reviewed business on the list
Recency5%Share of reviews from the last 12 months
Availability15%Weekly open hours, Saturday, Sunday, 24/7 or same-day
Trade focus10%How clearly the business does this trade (its Google category and name)
Proximity5%Based in the city scores highest, less the farther away it is
Claimed profile10%The business has claimed its ContractorsRanked profile (free or paid earn the same)
Partnered5%The business links to ContractorsRanked from its own website with our badge, checked periodically
ContractorsRanked reviews10%Verified customer reviews collected by ContractorsRanked: their rating and how many there are

Emergency HVAC contractors in Warrenton: questions

Which HVAC contractors in Warrenton are open 24/7?

25 on this list post 24/7 hours, including Schraer Heating & Air Conditioning, Hoock's Heating & Cooling, Level 9 Heating Cooling Plumbing, Elite Heating and Cooling and Renaud Brothers Heating & Cooling.

Who is ranked #1 for emergency heating and cooling in Warrenton, MO?

Schraer Heating & Air Conditioning is #1, with a CR Score of 65 out of 100 on emergency weights.

How are emergency HVAC contractors in Warrenton ranked?

Emergency lists move 10 points of the CR Score from reputation to availability: 15% and 15%. Availability credits 24/7 hours, same-day service, weekend hours and weekly open hours. 24/7 HVAC contractors are listed first, then same-day, then the rest; ranks follow that order. Paid placement never changes a rank.

What should I do before the HVAC contractor arrives?

If you smell gas, leave the building now and call your gas utility or 911 from outside.

How many emergency HVAC contractors here list a phone number?

25 of the 25 businesses ranked in full list a phone number. Tap Call to dial it.

Update log for Warrenton

  1. October 2026: CR Scores recalculated for 85 hvac contractors serving Warrenton.

More emergency and heating and cooling pages