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Emergency HVAC Contractors in Waterloo, ON (2026)

Top 50 of 249 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 Waterloo: Aire One Heating & Cooling KW, 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 Waterloo at a glance

Top emergency HVAC contractors in Waterloo at a glance
RankBusinessCR ScoreGoogle ratingBased inHours
1Aire One Heating & Cooling KW674.8★ (9,448)Kitchener, 5 km away24/7
2Reliance Heating, Air Conditioning & Plumbing664.7★ (2,268)Waterloo24/7
3Able Air Conditioning & Heating655.0★ (1,247)Kitchener, 6 km away24/7
4Delta Air Systems Ltd.654.9★ (631)Waterloo24/7
5Reliance Heating, Air Conditioning & Plumbing654.7★ (9,230)Cambridge, 19 km away24/7
6Dunn Heating and Air Conditioning654.7★ (969)Waterloo24/7
7Local Heating And Cooling645.0★ (397)Waterloo24/7
8Total Aire Care Inc.645.0★ (857)Kitchener, 9 km away24/7
9LG Home Comfort KWC644.9★ (674)Kitchener, 6 km away24/7
10Boehmers/Cronin Emery Home Services by Enercare644.8★ (1,534)Cambridge, 12 km away24/7

Call an emergency HVAC contractor in Waterloo 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 Waterloo, 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 249 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.

  8. #8 Total Aire Care Inc.

    Based in Kitchener, 9 km away

    64/100CR Score

    Ranked #8 because of its Google rating and trade focus: 5.0★ from 857 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 857 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    299 Manitou Dr A, Kitchener, ON N2C 1L5
    View profile for Total Aire Care Inc.(226) 894-1000

  9. #9 LG Home Comfort KWC

    Based in Kitchener, 6 km away

    64/100CR Score

    Ranked #9 because of its Google rating and trade focus: 4.9★ from 674 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 674 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    20 Hanson Ave, Kitchener, ON N2C 2E2
    View profile for LG Home Comfort KWC(226) 289-1301

  15. #15 Unique Air

    Based in Kitchener, 3 km away

    63/100CR Score

    Ranked #15 because of its Google rating and trade focus: 4.9★ from 187 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 187 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    533 Queen St S, Kitchener, ON N2G 1W9
    View profile for Unique Air(519) 729-3939

  20. #20 Air and Water Care

    Based in Kitchener, 9 km away

    62/100CR Score

    Ranked #20 because of its Google rating and trade focus: 5.0★ from 203 Google reviews, listed on Google as “HVAC contractor”.

    • 5.0★ from 203 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    169 Seabrook Dr, Kitchener, ON N2R 0E6
    View profile for Air and Water Care(226) 242-4328

Top 50 of 249 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 Waterloo, ranks 26 to 50
RankBusinessCR ScoreGoogle ratingDistance
26Oosterveld Heating & Air Conditioning614.8★ (1,575)27 km
27BreezeCome Home Services/Quality Breeze 清风到家 服务到家614.8★ (47)In Waterloo
28Aido Climate Solutions Inc.614.9★ (529)25 km
29Air Expert Home Comfort Inc614.6★ (155)9 km
30Climate Comfort Solutions614.9★ (35)In Waterloo
31The Honest Heating Company - HVAC Contractor Kitchener & Waterloo604.8★ (61)7 km
32ELEVATE AIR605.0★ (48)8 km
33Local Heating And Cooling604.9★ (40)6 km
34Markle Heating & Cooling Inc605.0★ (19)In Waterloo
35Superior Plumbing & Heating of Kitchener604.8★ (40)5 km
36City Heating and Cooling604.8★ (273)22 km
37Jambreeze Heating And Cooling595.0★ (115)20 km
38Hy-Mark Home Comfort594.8★ (450)29 km
39TRH Plumbing & Heating Inc594.9★ (149)In Waterloo
40Valley Mechanical595.0★ (54)16 km
41Air Pro Services594.8★ (29)9 km
42Guelph ClimateCare594.7★ (164)22 km
43Markle Heating & Cooling Inc595.0★ (9)In Waterloo
44Adaptive Mechanical Inc594.8★ (89)20 km
45Ultra Plumbing & HVAC585.0★ (15)7 km
46CMS Heating & Cooling585.0★ (24)12 km
47Local Own Comfort585.0★ (113)27 km
48Synergy Heating And Cooling Inc585.0★ (53)20 km
49Assurance Heating and Cooling584.9★ (87)24 km
50moe Heating & Air Conditioning Systems585.0★ (12)7 km

How we ranked emergency HVAC contractors in Waterloo

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 Waterloo: questions

Which HVAC contractors in Waterloo are open 24/7?

25 on this list post 24/7 hours, including Aire One Heating & Cooling KW, Reliance Heating, Air Conditioning & Plumbing, Able Air Conditioning & Heating, Delta Air Systems Ltd. and Reliance Heating, Air Conditioning & Plumbing.

Who is ranked #1 for emergency heating and cooling in Waterloo, ON?

Aire One Heating & Cooling KW is #1, with a CR Score of 67 out of 100 on emergency weights.

How are emergency HVAC contractors in Waterloo 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 Waterloo

  1. October 2026: CR Scores recalculated for 249 hvac contractors serving Waterloo.

More emergency and heating and cooling pages