KOLOSTAT · COMMERCIAL & INDUSTRIAL HVAC · SINCE 1927

Design, build, optimize, and maintain the mechanical systems of critical buildings

Specialized mechanical and HVAC contractor — from engineering and design-build to 24/7 service — for commercial, industrial (critical installations), and multi-residential buildings across Quebec and Ontario.

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ANNOUNCEMENT · 2025

Kolostat joins Groupe Climater

Kolostat, KROME, and MSB Mechanical are now part of Climater Canada — a new look, the same teams, the same engineering.

Read the announcementVisit Climater Canada
1927
FoundedBuilding mechanics in Quebec — nearly 100 years in business
0 t
GHG avoided annually≈ 15,000 cars off the road
Up to 0%
Grant-financedÉcoPerformance + co-funding stacked

HVAC & mechanical services

Four jobs. One mechanical contractor

From HVAC design-build to decarbonization and 24/7 service — there's one enterprise-grade mechanical contractor to call.

Who we work with

Built for the assets you operate

  1. Commercial & office

    Office towers, multi-residential, mixed-use — focused on rentability, ESG, and operating cost.

  2. Industrial & manufacturing

    Robust systems for manufacturing, food, pharma, agri-food. Built to keep production running.

  3. Mission-critical & data centers

    Redundant cooling for data centers, labs, cleanrooms. Designed where downtime is not an option.

  4. Other sectors

    Schools, healthcare, government, and every building that doesn’t fit the usual boxes — built for a 30-year life cycle.

How we work

Four steps from diagnosis to delivery

  1. Meet

    Site walk and discovery. Free.

  2. Visit

    We measure existing conditions and constraints.

  3. Diagnose

    Engineering proposal with cost, schedule, and grant eligibility.

  4. Build

    Execution, commissioning, performance handover.

Trusted by

Library and Archives Canada, Bell, TELUS, Banque Nationale, Bristol-Myers Squibb, Ontario Power Generation — and many more across Quebec and Ontario.

Get started

Tell us about your building

We'll send a senior engineer within 48 hours.

Request a quote 514-333-7333