Best HVAC Contractors in London, Ontario
The most trusted HVAC contractor in London, Ontario is Donaldson Heating and Air Conditioning, with a ProScore of 80/100.
The most trusted HVAC contractor in London, Ontario is Donaldson Heating and Air Conditioning, with a ProScore of 80/100. ProScore has verified 42 HVAC contractors in London, scoring each across 10+ data sources and 20+ trust signals. 5 of the 42 are Trusted-tier (70+) or higher.
Last updated: May 6, 2026 · Data refreshed daily
Of 42 hvac contractors in London: 0 rated Elite (82+), 7 rated Trusted (70+), and 28 rated Good (55+).
How ProScore Ranks HVAC Contractors
Every HVAC contractor in London is evaluated across four pillars: Reputation (ratings across multiple platforms), Verification (government licensing including TSSA and WSIB), Transparency (online presence and profile completeness), and Sentiment (AI analysis of customer reviews). The result is a ProScore from 0 to 100.
Read the full methodology →Frequently Asked Questions
Who is the best HVAC contractor in London?
Donaldson Heating and Air Conditioning has the highest ProScore (80/100) among 42 verified hvac contractors in London, Ontario. Rankings are based on ProScore, which evaluates ratings, government licensing (TSSA), WSIB coverage, and AI-analyzed customer sentiment.
How do I find a trustworthy HVAC contractor in London?
Look for hvac contractors with verified TSSA licensing, active WSIB coverage, and consistent ratings across multiple platforms. ProScore aggregates these signals into a single score from 0-100. In London, 0 hvac contractors hold Elite-tier ProScores (82+), 7 are Trusted-tier (70+), and 28 are Good-tier (55+).
Are hvac contractors in London licensed?
HVAC Contractors in Ontario are required to hold TSSA licensing. ProScore verifies this against official TSSA records for every provider in our database. Of the top 5 hvac contractors in London by ProScore, 4 hold verified TSSA credentials and 5 carry active WSIB coverage.
How many verified hvac contractors are in London?
ProScore has verified and scored 42 hvac contractors in London, Ontario. Each provider is evaluated using 10+ data sources, 20+ trust signals, and AI-analyzed customer reviews. Data is refreshed daily.
What's the ProScore distribution among hvac contractors in London?
Among 42 verified hvac contractors in London, Ontario: 0 are Elite-tier (82+), 7 are Trusted-tier (70+), and 28 are Good-tier (55+). The top 5 average a ProScore of 76/100, with Donaldson Heating and Air Conditioning leading at 80/100.