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ContractorsRanked

Best HVAC Contractors in Thorold, ON (2026)

212 HVAC contractors ranked by CR ScoreUpdated 0 paid placements in this rankingHow we rank →

The short answer

  1. 1

    Best overall in Thorold: Reliance Heating, Air Conditioning & Plumbing, CR Score 94/100; 4.8★ from 2,986 Google reviews; open 24/7.

  2. 2

    Best for emergencies (open 24/7): Mr. Furnace Heating and Air Conditioning, posts 24/7 hours; ranked #2 of 212.

  3. 6

    Most-reviewed: Zenner & Ritter Home Services, 5,592 Google reviews at 4.9★, the most of 212 ranked; ranked #6.

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

212 Thorold HVAC contractors are ranked here by CR Score, from 8 published factors. 91 are open 24/7, 138 open Saturdays and 115 open Sundays, based on posted hours. The median Google rating is 4.8★ across 212 rated businesses.

Most of this list also appears on the HVAC contractors in Niagara Falls ranking. See HVAC contractors in Niagara Falls

Top 10 HVAC contractors in Thorold at a glance

Top 10 HVAC contractors in Thorold at a glance
RankBusinessCR ScoreGoogle ratingBased inHoursBest for
1Reliance Heating, Air Conditioning & Plumbing944.8★ (2,986)St. Catharines, 6 km away24/7Overall
2Mr. Furnace Heating and Air Conditioning934.8★ (2,672)St. Catharines, 7 km away24/7Emergencies
3Enercare914.6★ (2,788)St. Catharines, 9 km away24/7—
4Evans Heating & Cooling914.8★ (822)Niagara Falls, 9 km away24/7—
5T-Mark Plumbing, Heating & Cooling- Buffalo904.9★ (3,978)Buffalo, 34 km away24/7—
6Zenner & Ritter Home Services904.9★ (5,592)Buffalo, 37 km away24/7Most reviews
7MacKay Heating & Cooling904.8★ (349)St. Catharines, 6 km away24/7—
8Roy's Plumbing, Heating, Cooling & Electrical904.8★ (3,074)Tonawanda, 28 km away24/7—
9Tropical Heating & Cooling - Niagara Falls904.9★ (405)Niagara Falls, 13 km away24/7—
10Just Right Heating & Cooling905.0★ (384)Grand Island, 19 km away24/7—

The 212 best HVAC contractors in Thorold, ranked

Ordered by CR Score, a 0–100 score from 8 published factors. Paid placement never changes the order.

Scores below: based on 6 of 8 factors; credentials and recency not yet collected. Hatched segments mark factors we don't have yet.

  3. #3 Enercare

    Based in St. Catharines, 9 km away

    91/100CR Score

    Ranked #3 because of its Google rating and availability: 4.6★ from 2,788 Google reviews, open 24/7.

    • 4.6★ from 2,788 Google reviews
    • Open 24/7
    Hours
    Open 24 hours, 7 days
    Address
    30 Hannover Dr, St. Catharines, ON L2W 1A3
    View profile for Enercare(905) 225-1107

  14. #14 Pure Air Care

    Based in Niagara Falls, 16 km away

    88/100CR Score

    Ranked #14 because of its Google rating and trade focus: 4.9★ from 877 Google reviews, listed on Google as “Air conditioning contractor”.

    • 4.9★ from 877 Google reviews
    Hours
    Mon–Sun 8 AM–8 PM
    Address
    5016 Saunders Settlement Rd, Niagara Falls, NY 14305, United States
    View profile for Pure Air Care(716) 367-8137

  17. #17 Williams Kool Heat

    Based in Welland, 14 km away

    87/100CR Score

    Ranked #17 because of its Google rating and trade focus: 4.9★ from 560 Google reviews, listed on Google as “HVAC contractor”.

    • 4.9★ from 560 Google reviews
    Hours
    Mon–Sun 8 AM–7 PM
    Address
    67 River Rd, Welland, ON L3C 6X8
    View profile for Williams Kool Heat(289) 820-5665

HVAC contractors ranked #26 to #28

#1 to #25 are shown in full above. Here are #26 to #28, in CR Score order; each links to its profile. We publish the top 28 of 212 ranked HVAC contractors here; the rest are on their profiles.

HVAC contractors in Thorold, ranks 26 to 28
RankBusinessCR ScoreGoogle ratingDistance
26Carlton 5 Mechanical Services854.1★ (13)In Thorold
27Erie Niagara Heating and Cooling855.0★ (38)23 km
28O'Donnell Heating & Air Conditioning Inc - Buffalo854.7★ (430)35 km

How much do HVAC contractors cost in Thorold?

US national ranges converted to CAD, not adjusted for Thorold. Each row names its basis and the month we checked it.

How much do HVAC contractors cost in Thorold?
JobLowTypicalHighBasisChecked
AC replacementCA$5,460CA$8,400CA$11,350Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026)October 2026
Furnace replacementCA$3,970CA$6,770CA$9,690Per system, installed; typical range of customer-reported jobs. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026)October 2026

When to hire an HVAC contractor in Ontario

In Ontario, furnace and heat pump calls peak in the coldest winter weeks and AC calls in summer heat waves. Spring and fall are the easiest times to book maintenance or a replacement.

How we ranked Thorold HVAC contractors

We scored 212 Thorold HVAC contractors on 8 factors, weighted as shown. A business is ranked when its trade is confirmed and it has 3 or more Google reviews or a claimed profile. Unknown factors are left out of the score, not counted as zero. Scores last refreshed October 22, 2026.

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 fromIn Thorold data
Reputation35%Bayesian-adjusted Google star ratingMeasured
Credentials15%Active state license 0.6, bond 0.2, workers’ comp 0.2Not yet collected
Review volume10%log10(reviews + 1) against the list maximumMeasured
Recency10%Share of reviews from the last 12 monthsNot yet collected
Availability10%Weekly open hours, Saturday, Sunday, 24/7 or same-dayMeasured
Trade focus10%Google main category 1.0, business name 0.7, additional category 0.5Measured
Proximity5%1.0 when based in the city, falling to 0 at the trade’s radiusMeasured
Completeness5%Website, photos, description, hours, claimed profile (0.2 each)Measured

HVAC contractors in Thorold: frequently asked questions

Who is the best HVAC contractor in Thorold?

By CR Score, the highest-ranked HVAC contractor in Thorold, ON is Reliance Heating, Air Conditioning & Plumbing with a CR Score of 94/100. It has 4.8★ from 2,986 Google reviews. It is open 24/7. Mr. Furnace Heating and Air Conditioning (#2) and Enercare (#3) follow. We ranked 212 HVAC contractors on 8 factors, last updated October 22, 2026.

How many HVAC contractors are there in Thorold?

ContractorsRanked ranks 212 HVAC contractors serving Thorold, ON. 2 of them are based in Thorold; the rest serve it from nearby towns. Counts are as of October 2026.

Which HVAC contractors in Thorold are open 24/7?

91 ranked HVAC contractors in Thorold post 24/7 hours. The highest-ranked are Reliance Heating, Air Conditioning & Plumbing (#1), Mr. Furnace Heating and Air Conditioning (#2) and Enercare (#3). Hours come from each business's Google listing as of October 2026, so call to confirm.

Which HVAC contractors in Thorold work on weekends?

138 of 212 ranked HVAC contractors post Saturday hours and 115 post Sunday hours. The highest-ranked open Saturdays are Reliance Heating, Air Conditioning & Plumbing (#1), Mr. Furnace Heating and Air Conditioning (#2) and Enercare (#3). Posted hours are office hours; crews may book weekend jobs separately.

How much does ac replacement cost in Thorold?

AC replacement typically costs CA$5,460 to CA$11,350, with CA$8,400 typical (Per system, installed (unit plus labor); typical range of customer-reported jobs. US national range converted at 1.4054 CAD per USD (Bank of Canada, October 20, 2026)). This is a national range, not adjusted for Thorold. Prices were last checked October 2026. Get at least two written quotes before you hire.

What Google rating do Thorold HVAC contractors have?

The median Google rating among 212 rated HVAC contractors in Thorold is 4.8★, with a median of 23 reviews. Zenner & Ritter Home Services has the most, 5,592 reviews, and ranks #6. We adjust ratings for review count, so a few five-star reviews cannot top the list.

When is the best time to hire an HVAC contractor in Thorold?

In Ontario, furnace and heat pump calls peak in the coldest winter weeks and AC calls in summer heat waves. Spring and fall are the easiest times to book maintenance or a replacement.

How does ContractorsRanked rank HVAC contractors?

Each HVAC contractor gets a 0–100 CR Score from 8 published factors, led by reputation (35%), credentials (15%), review volume (10%) and recency (10%). Factors we cannot measure are left out, not scored as zero. Only businesses with a confirmed trade and 3 or more reviews, or a claimed profile, are ranked.

Update log for Thorold

  1. October 2026: CR Scores recalculated for 212 hvac contractors serving Thorold.
  2. October 2026: 1 duplicate listing merged.

More HVAC contractors and Thorold pages

Other trades in Thorold