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Emergency HVAC Contractors in Union, MO (2026)

Top 50 of 60 HVAC contractors, in emergency orderUpdated 0 paid placements in this rankingHow we rank

15 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 Union: Level 9 Heating Cooling Plumbing, 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 Union at a glance

Top emergency HVAC contractors in Union at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Level 9 Heating Cooling Plumbing654.9★ (1,254)Washington, 6 mi away24/7
2Menke Heating and Cooling635.0★ (99)Union24/7
3Lakebrink Heating & Air Conditioning624.7★ (99)Union24/7
4Renaud Brothers Heating & Cooling605.0★ (609)Wentzville, 22 mi away24/7
5Future Aire594.7★ (320)Eureka, 20 mi away24/7
6Saylors Systems Heating and AC Repair595.0★ (174)Eureka, 20 mi away24/7
7Brandt HVAC595.0★ (7)Union24/7
8Eureka Heating and Cooling584.8★ (104)Eureka, 20 mi away24/7
9Future Aire Heating & Air Conditioning575.0★ (9)Washington, 8 mi away24/7
10Ron's Water Heating Repair North Richland Hills574.6★ (26)Pacific, 15 mi away24/7

Call an emergency HVAC contractor in Union 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 Union, 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 60 is on the HVAC contractors page.

  1. Ranked #1 in Union

    #1 Level 9 Heating Cooling Plumbing

    Based in Washington, 6 mi away

    65/100CR Score

    Ranked #1 because of its Google rating and trade focus: 4.9★ from 1,254 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.9★ from 1,254 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    400 M E Frick Rd, Washington, MO 63090
    View profile for Level 9 Heating Cooling Plumbing(636) 206-6973

  2. #2 Menke Heating and Cooling

    Based in Union

    63/100CR Score

    Ranked #2 because of its Google rating and trade focus: 5.0★ from 99 Google reviews, listed on Google as “Air conditioning contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 99 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    151 Oak Tree Ln, Union, MO 63084
    View profile for Menke Heating and Cooling(636) 583-5621

  5. #5 Future Aire

    Based in Eureka, 20 mi away

    59/100CR Score

    Ranked #5 because of its Google rating and trade focus: 4.7★ from 320 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.7★ from 320 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    690 W 4th St, Eureka, MO 63025
    View profile for Future Aire(636) 938-5290

  7. #7 Brandt HVAC

    Based in Union

    59/100CR Score

    Ranked #7 because of its Google rating and trade focus: 5.0★ from 7 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 7 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1 E State St, Union, MO 63084
    View profile for Brandt HVAC(573) 301-1388

  8. #8 Eureka Heating and Cooling

    Based in Eureka, 20 mi away

    58/100CR Score

    Ranked #8 because of its Google rating and trade focus: 4.8★ from 104 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.8★ from 104 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    1329 W 5th St, Eureka, MO 63025
    View profile for Eureka Heating and Cooling(636) 200-3005

  11. #11 Gallagher Mechanical

    Based in Pacific, 15 mi away

    56/100CR Score

    Ranked #11 because of its Google rating and trade focus: 3.9★ from 33 Google reviews, listed on Google as “Air conditioning contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 3.9★ from 33 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    400 E Union St, Pacific, MO 63069
    View profile for Gallagher Mechanical(636) 257-4328

  13. #13 Wyzer Heating and Cooling 🔥❄️👨‍🔧

    Based in Saint Peters, 23 mi away

    55/100CR Score

    Ranked #13 because of its Google rating and trade focus: 5.0★ from 25 Google reviews, listed on Google as “Air conditioning contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 25 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for Wyzer Heating and Cooling 🔥❄️👨‍🔧(314) 609-3035

  14. #14 Quality Air

    Based in Murphy, 24 mi away

    54/100CR Score

    Ranked #14 because of its Google rating and trade focus: 4.4★ from 17 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.4★ from 17 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    View profile for Quality Air(314) 912-2926

  16. #16 B & S Heating & Cooling

    Based in Union

    52/100CR Score

    Ranked #16 because of its Google rating and trade focus: 4.7★ from 32 Google reviews, listed on Google as “Air conditioning contractor”.

    Based on 7 of 10 factors; credentials, recency and availability not yet collected.

    • 4.7★ from 32 Google reviews
    Address
    219 S Oak St #1953, Union, MO 63084
    View profile for B & S Heating & Cooling(636) 583-8404

  18. #18 The Air Guys

    Based in Washington, 7 mi away

    46/100CR Score

    Ranked #18 because of its Google rating and trade focus: 4.2★ from 5 Google reviews, listed on Google as “HVAC contractor”.

    Based on 7 of 10 factors; credentials, recency and availability not yet collected.

    • 4.2★ from 5 Google reviews
    Address
    602 Washington Ave, Washington, MO 63090
    View profile for The Air Guys(636) 390-0112

  19. #19 Crystal Heating & Cooling

    Based in Washington, 6 mi away

    45/100CR Score

    Ranked #19 because of its Google rating and trade focus: 4.9★ from 497 Google reviews, listed on Google as “Furnace repair service”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.9★ from 497 Google reviews
    Hours
    Mon–Fri 8 AM–4:30 PM · Sat–Sun closed
    Address
    600 Washington Square Center, Washington, MO 63090
    View profile for Crystal Heating & Cooling(636) 900-9397

  23. #23 Superior Service

    Based in Dardenne Prairie, 25 mi away

    43/100CR Score

    Ranked #23 because of its Google rating and trade focus: 5.0★ from 2,219 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 5.0★ from 2,219 Google reviews
    Hours
    Mon–Fri 7 AM–8:30 PM · Sat–Sun 8 AM–12 PM
    Address
    101 Stag Industrial Blvd, Lake St Louis, MO 63367
    View profile for Superior Service(636) 812-6645

  25. #25 Fresh Air Heating and Cooling

    Based in Chesterfield, 24 mi away

    43/100CR Score

    Ranked #25 because of its Google rating and trade focus: 4.9★ from 1,784 Google reviews, listed on Google as “HVAC contractor”.

    Based on 8 of 10 factors; credentials and recency not yet collected.

    • 4.9★ from 1,784 Google reviews
    Hours
    Mon–Sun 7 AM–7 PM
    Address
    612 Spirit Valley E Dr, Chesterfield, MO 63005
    View profile for Fresh Air Heating and Cooling(636) 224-6106

Top 50 of 60 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 Union, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26AVS Heating and Cooling424.2★ (5)22 mi
27FRUEH414.8★ (16)In Union
28West County Heating & Cooling414.8★ (186)15 mi
29Juergens Heating & Cooling LLC414.9★ (308)19 mi
30Alferman Air405.0★ (24)6 mi
31Gradel Heating & Cooling405.0★ (26)7 mi
32Evans Heating and Air Conditioning405.0★ (45)11 mi
33Mantle Heating & Cooling404.7★ (30)7 mi
34Potter heating and cooling405.0★ (6)In Union
35JD's Heating & Cooling404.6★ (21)7 mi
36Dustin's Affordable Heating and Cooling394.8★ (19)8 mi
37Summit Heating & Cooling394.9★ (25)12 mi
38Gildehaus Comfort Systems, INC394.6★ (55)15 mi
39Boles No 1 Plumbing Heating AC383.2★ (20)6 mi
40Roettering Heating & Cooling384.1★ (9)7 mi
41Williams Heating & Cooling384.4★ (43)17 mi
42One Hour Heating & Air Conditioning® of West County375.0★ (58)24 mi
43The Appliance Guys374.6★ (3,464)21 mi
44Fenton375.0★ (18)19 mi
45Comfort Zone Heating & Cooling375.0★ (28)22 mi
46Lolich Heating and Cooling LLC375.0★ (43)25 mi
47Gradel Heating & Cooling LLC365.0★ (3)10 mi
48Doll Mechanical Services & Engineering365.0★ (5)13 mi
49Quality Cooling & Heating365.0★ (23)22 mi
50Joseph's Heating And Air Conditioning364.4★ (26)20 mi

How we ranked emergency HVAC contractors in Union

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 Union: questions

Which HVAC contractors in Union are open 24/7?

15 on this list post 24/7 hours, including Level 9 Heating Cooling Plumbing, Menke Heating and Cooling, Lakebrink Heating & Air Conditioning, Renaud Brothers Heating & Cooling and Future Aire.

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

Level 9 Heating Cooling Plumbing is #1, with a CR Score of 65 out of 100 on emergency weights.

How are emergency HVAC contractors in Union 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 Union

  1. October 2026: CR Scores recalculated for 60 hvac contractors serving Union.

More emergency and heating and cooling pages