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 commissioning — for commercial, industrial (critical installations), and multi-residential buildings across Canada. Maintenance and 24/7 service in Quebec and Ontario.
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.
Trusted by
Library and Archives Canada, Bell, TELUS, Banque Nationale, Bristol-Myers Squibb, Ontario Power Generation — and many more across Canada.
- 1927
- FoundedNearly 100 years of building mechanics — now across Canada.
- 55,000 t
- GHG avoided annually≈ 15,000 cars off the road
- Up to 75%
- Grant-financedOn eligible Quebec projects: ÉcoPerformance plus stacked co-funding.
HVAC & mechanical services
Four jobs. One mechanical contractor
From HVAC design-build to decarbonization across Canada, plus maintenance and 24/7 service in Quebec and Ontario — one enterprise-grade mechanical contractor to call.
Design-build
One contract from engineering to commissioning.
Explore design-build
Optimize
Re-engineer end-of-life HVAC into a profitable asset.
Explore optimize
Decarbonize
Heat pumps, heat recovery, electrification, net-zero roadmap.
Explore decarbonize
Maintain
Preventive contracts plus 24/7 dispatch on 25+ service trucks across Greater Montréal and the GTA.
Explore maintain
Who we work with
Built for the assets you operate
Commercial & office
Office towers, multi-residential, mixed-use — focused on rentability, ESG, and operating cost.
Mission-critical & data centers
Redundant cooling for data centers, labs, cleanrooms. Designed where downtime is not an option.
Industrial & manufacturing
Robust systems for manufacturing, food, pharma, agri-food. Built to keep production running.
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
Meet
Discovery call; free site walk in Quebec and Ontario.
Visit
We measure existing conditions and constraints.
Diagnose
Engineering proposal with cost, schedule, and grant eligibility.
Build
Execution, commissioning, performance handover.
Get started
Tell us about your building
A senior engineer will get back to you within 48 hours.