Company lists · Data refreshed September 2026

Top 25 Hvac services based in Ottawa, Canada

Name: Hvac services based in Ottawa, Canada
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 60 companies tracked

RevenueBase identified 60 hvac services headquartered in Ottawa, Canada as of September 2026 and tracks 550 professional contacts across them, including 255 with verified work emails. Calgary is the largest hub.

This list covers hvac services headquartered in Ottawa, Canada, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review

60Companies

550Contacts tracked

255Verified emails

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The 25 largest hvac services based in Ottawa, Canada

Ranked by team size

Top 25 of 60 hvac services based in Ottawa, Canada, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to hvac services: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Dilfo Mechanical	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	51-200	68 contacts →
	Indirect evidence “Dilfo Mechanical Limited is one of Eastern Ontario’s largest mechanical contracting firms, specializing in the full range of services, from large-scale design-build projects to…” Source: RevenueBase Database · checked Sep 21, 2026
2	Lar-Mex INC	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	51-200	57 contacts →
	Strong evidence “Lar-Mex with a staff of over 200 employees has been providing heating, ventilation, plumbing and air conditioning (HVAC) services to the National Capital region for over 30 years.” Source: RevenueBase Database · checked Sep 21, 2026
3	TPH Plumbing & Heating	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	40 contacts →
	Indirect evidence “Since 1986, we have been providing commercial, industrial and institutional piping, plumbing and heating services to Ottawa and Eastern Ontario.” Source: RevenueBase Database · checked Sep 21, 2026
4	Climate Works Heating, Cooling & Plumbing	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	51-200	35 contacts →
	Indirect evidence “Climate Works is a leading mechanical service provider based in Ottawa, delivering professional heating, cooling, ventilation, and plumbing solutions to commercial, industrial…” Source: RevenueBase Database · checked Sep 21, 2026
5	WMC Water Management	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	24 contacts →
	Indirect evidence “WMC Water Management specializes in the optimization of heating and cooling systems within large commercial, residential, industrial, and institutional buildings.” Source: RevenueBase Database · checked Sep 21, 2026
6	Optimum Mechanical Solutions INC	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	51-200	24 contacts →
	Strong evidence “Our primary focus is the commercial business sector caring for the HVAC, plumbing, emergency service, design/build and preventive maintenance needs of nationally and locally owned…” Source: RevenueBase Database · checked Sep 21, 2026
7	Francis Plumbing Heating & Cooling	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	17 contacts →
	Indirect evidence “For over 90 years the Francis Plumbing & Heating team has continued to provide ongoing excellence in water services including plumbing, heating, radiant floor heating, boilers…” Source: RevenueBase Database · checked Sep 21, 2026
8	Total Hvac	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	15 contacts →
	Strong evidence “Total HVAC has been a leader in the supply of commercial heating, ventilation, and air-conditioning equipment in Eastern Ontario and Western Quebec for 25 years.” Source: RevenueBase Database · checked Sep 21, 2026
9	Proeng	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	14 contacts →
	Indirect evidence “Building and Energy Engineers” Source: RevenueBase Database · checked Sep 21, 2026
10	Anchor Home Comfort	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	14 contacts →
	Indirect evidence “Anchor is a residential heating and cooling contractor specializing in replacement, repair and maintenance of home comfort systems.” Source: RevenueBase Database · checked Sep 21, 2026
11	Reliable Home Environment	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	13 contacts →
	Indirect evidence “Reliable Home Environment has a strong reputation in Ottawa for providing signature custom installations of heating and cooling products that consistently exceed our customers’…” Source: RevenueBase Database · checked Sep 21, 2026
12	TL Mechanical INC	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	51-200	12 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
13	Baxtec Mechanical Services	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	51-200	11 contacts →
	Indirect evidence “Baxtec Mechanical Services is a dynamic and growing commercial mechanical contractor in the Ottawa area.” Source: RevenueBase Database · checked Sep 21, 2026
14	Team Harding	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	51-200	11 contacts →
	Indirect evidence “Ottawa's Source For Total Home Comfort Since 1994 Heating • Cooling • Fireplaces • BBQs & Grills” Source: RevenueBase Database · checked Sep 21, 2026
15	Convex Energy INC	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	1-10	10 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
16	Longhill Energy Products	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	10 contacts →
	Indirect evidence “For over four decades, Longhill Energy has become known for its “niche” specialty products in Ottawa and across Ontario.” Source: RevenueBase Database · checked Sep 21, 2026
17	3v Mechanical INC	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	9 contacts →
	Indirect evidence “Established in 3V Mechanical has been providing the National Capital Region with mechanical service for over 24 years.” Source: RevenueBase Database · checked Sep 21, 2026
18	Harry's Home Comfort	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	8 contacts →
	Indirect evidence “Harrys Home Comfort is a leading heating and cooling business that serves Ottawa and surrounding area.” Source: RevenueBase Database · checked Sep 21, 2026
19	Premier Comfort Heating & Cooling LTD	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	8 contacts →
	Indirect evidence “Our History in Ottawa.” Source: RevenueBase Database · checked Sep 21, 2026
20	JD Swallow Heating And Cooling Contractors	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	7 contacts →
	Indirect evidence “Nearly fifty years ago we set out to make a different kind of service company.” Source: RevenueBase Database · checked Sep 21, 2026
21	Controls Depot	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	1-10	7 contacts →
	Strong evidence “Provide market leading products to the HVAC industry, backed by technical expertise and customer satisfaction.” Source: RevenueBase Database · checked Sep 21, 2026
22	Ottawa Home Services	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	7 contacts →
	Indirect evidence “Ottawa’s heating and cooling specialists.” Source: RevenueBase Database · checked Sep 21, 2026
23	PSL Mechanical	Indirect evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	6 contacts →
	Indirect evidence “For the last 10 years PSL has been one of Ottawa's most trusted mechanical services firms working with commercial and residential clients.” Source: RevenueBase Database · checked Sep 21, 2026
24	Ambassador Dearie Hvac	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	201-500	6 contacts →
	Strong evidence “Furnace Repair Installation & Air Conditioning Replacement - Ottawa, ON - Call Ambassador Dearie HVAC Inc.” Source: RevenueBase Database · checked Sep 21, 2026
25	Coolheat Comfort Systems	Strong evidence	Ottawa, ON, CanadaHQ checked Sep 21, 2026	11-50	6 contacts →
	Strong evidence “Coolheat Comfort Systems is a fully licensed HVAC company based in Ottawa, Ontario.” Source: RevenueBase Database · checked Sep 21, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: hvac services. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names hvac services.
Partial evidence: Its own public description names part of hvac services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name hvac services. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 60 hvac services based in Ottawa, Canada

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Hvac services based in Ottawa, Canada at a glance

As of Sep 21, 2026

46.4%Verified-email coverage

9.2Average contacts per company

11-50Median size (employees)

215.0%Largest-city concentration · Calgary

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole Canada list rather than for Ottawa, so it is reported there. Company counts and contact totals on this page are exact for Ottawa, over 60 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among hvac services, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Ottawa, Canada whose own description of what they do matches “hvac services”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names hvac services), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among hvac services, and records with no verified work email. Companies headquartered outside Ottawa are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 255 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 21, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Hvac services by metro in Canada

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names hvac services, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many hvac services are there based in Ottawa, Canada?

RevenueBase identified 60 hvac services headquartered in Ottawa, Canada as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Dilfo Mechanical, headquartered in Ottawa, tops this list with the largest team on record.

Which city has the most hvac services?

Calgary leads with 129 headquartered companies, followed by Toronto (116) and Edmonton (80).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 255 verified decision-maker contacts tracked across these 60 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.