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Servicing the community since 1937

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Clow Darling is the largest complete mechanical service contractor in Northwestern Ontario specializing in plumbing, heating, cooling, boilers and piping for the industrial, commercial, and residential markets. Our services also include a mobile air conditioning and heating department.

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3 weeks ago

Clow Darling
THANK YOU to Thunder Bay and Northwestern Ontario for voting Clow Darling Ltd. the #1 Heating & Cooling Supplier in this year's Chronicle Journal Reader's Choice Awards! ... See MoreSee Less
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3 weeks ago

Clow Darling
Here’s a nasty pinhole that we cut out of a 1-1/4” line yesterday. Call us today for a FREE leak detection and quote before one of these possibly sneak up on you! 😬 ... See MoreSee Less
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4 weeks ago

Clow Darling
Happy Friday, Thunder Bay!Since it's National #givesomethingawayday, we're giving out some Clow Darling baseball caps! Reply below and we'll randomly select 5 winners from the list on Monday.Good luck, and have a great weekend! ... See MoreSee Less
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