A warehouse that can’t hold temperature in January, a rooftop unit that quits during a July heat wave, a shop where fumes linger because the ventilation can’t keep up: these problems cost businesses money, productivity, and sometimes safety. Commercial HVAC Calgary property owners rely on has to handle more than comfort. It protects inventory, equipment, and the people working in your building through some of the most demanding weather in Canada.
This guide explains how commercial and industrial HVAC systems work, which equipment is common in Calgary buildings, what typically goes wrong, and how to choose a service provider. It’s written for business owners, property managers, and facility operators who want clear information before making a decision.
What Is Commercial HVAC and How Does It Work?
Commercial HVAC (heating, ventilation, and air conditioning) is the set of systems that heat, cool, ventilate, and control the air quality of non-residential buildings such as offices, retail units, warehouses, workshops, and industrial facilities. These systems move heat and air to keep a building within a target temperature and bring in enough fresh air to meet ventilation needs.
How Is Commercial HVAC Different From Other Systems?
The main differences are scale, variety, and purpose. A commercial building may have large open volumes, high ceilings, several temperature zones, process equipment that produces heat or fumes, and long operating hours. Equipment is usually larger and often roof-mounted or suspended from the ceiling to save floor space. A single building may combine several types of equipment: a rooftop unit for the office area, unit heaters in the shop, and a make-up air unit to replace exhausted air.
Because of this, commercial HVAC is rarely one-size-fits-all. The right system depends on the building’s size, layout, insulation, use, and occupancy.
The Main Components of a Commercial HVAC System
Most systems are built from a handful of building blocks:
- Heating equipment: furnaces, unit heaters, tube or radiant heaters, boilers, or heat pumps.
- Cooling equipment: air conditioners, heat pumps, and rooftop units that provide cooling.
- Ventilation equipment: exhaust fans, make-up air units, and ductwork that move air in and out.
- Controls: thermostats, schedules, and building controls that decide when and how equipment runs.
- Filters, dampers, and sensors: the parts that protect equipment and keep airflow balanced.
When one component is undersized, neglected, or poorly controlled, the rest of the system often pays for it through higher running costs, uneven temperatures, or premature failure.
Why Calgary’s Climate Changes the Equation
Calgary’s weather is demanding on mechanical equipment. Winters bring extended cold, and temperatures can drop well below -20°C. Chinook winds can then lift temperatures by many degrees within hours, which means heating systems may cycle hard and fast. Summers can be hot and dry, and cooling demand has become a real consideration for many buildings that once only worried about heat.
In practical terms, this means:
- Heating equipment needs to be sized and maintained for sustained cold, not just average conditions.
- Ventilation is a winter challenge, because every cubic metre of outdoor air brought in has to be heated.
- Equipment that sits idle for months, such as rooftop cooling, can fail on the first hot day if it hasn’t been inspected.
- Frozen condensate lines, snow and ice on rooftop equipment, and blocked intakes are common seasonal issues.
Commercial HVAC Services Available in Calgary
A commercial HVAC contractor typically covers a range of work, from routine maintenance to full system design. Here is how the main service areas fit together for Calgary businesses. Purcell Commercial HVAC provides commercial and industrial services across these categories.
Heating
Heating is the backbone of commercial HVAC in Calgary. Depending on the building, this can include commercial furnaces, unit heaters, radiant systems, or heat pumps. The right choice depends on ceiling height, how much of the building is occupied at any one time, and how much outside air the building must bring in.
Cooling and Heat Pumps
Cooling in commercial buildings is commonly delivered by rooftop units, split systems, or commercial heat pumps. Heat pumps move heat rather than generating it by combustion, and can provide both heating and cooling. Their suitability for a given Calgary building depends on the building’s design and how the system is configured for cold weather, which is worth discussing with a qualified contractor.
Ventilation and Exhaust
Ventilation keeps indoor air fresh and removes moisture, odours, fumes, and heat. Commercial exhaust fans pull air out of kitchens, washrooms, workshops, and process areas. Whenever air is exhausted, the building needs to replace it, which is where make-up air comes in (covered below).
Commercial Refrigeration
Restaurants, grocers, food producers, and cold-storage operators depend on commercial refrigeration to protect products. A refrigeration failure can mean spoiled inventory within hours, so fast, competent repair matters.
Maintenance, Emergency Repair, and System Design
Three service types cut across all of the above:
- Preventive maintenance, including regular maintenance plans that schedule inspections before the heating and cooling seasons.
- Emergency repairs when a system fails unexpectedly.
- System design and installation for new buildings, tenant improvements, or equipment replacement.
Understanding Commercial Make-Up Air Systems
What Is an Air Makeup Unit and Why Do Buildings Need One?
An air makeup unit is a piece of equipment that brings filtered outdoor air into a building to replace air removed by exhaust fans, process equipment, or combustion appliances. Without it, a building can end up under negative pressure, which creates problems that range from annoying to unsafe.
Make-up air systems matter most in buildings that exhaust a lot of air: commercial kitchens, auto and welding shops, paint or spray areas, woodworking facilities, and many industrial spaces. In Calgary, make-up air is also a heating issue. Incoming winter air can be very cold, so many units are designed to heat the air before it enters space. Explore how this equipment is applied on our commercial make-up air units page.
Signs Your Building Needs Make-Up Air
Watch for these symptoms, which often point to inadequate make-up air:
- Doors that are hard to open or that slam shut.
- Whistling or drafts at doors and windows.
- Exhaust fans that seem weak or noisy despite running normally.
- Combustion appliances that don’t draw properly or vent poorly.
- Cold spots near doors and a space that never quite warms up.
- Lingering odours, fumes, or humidity.
Combustion appliances that can’t vent properly can create carbon monoxide risks. If you suspect a venting issue, treat it as urgent and have it assessed by a qualified professional.
Common Make-Up Air Problems
Common issues include clogged filters, failed burners or ignition components, faulty sensors, dampers that stick or don’t modulate, belts and motors that wear out, and controls that aren’t coordinated with the exhaust fans. Many of these are found early during routine inspection. A unit that is working but poorly matched to the building’s exhaust load is also common, especially after a facility has changed how it uses the space.
Commercial Rooftop Units and Their Maintenance
What Is a Rooftop Unit?
A rooftop unit (RTU) is a packaged HVAC system installed on a building’s roof that provides heating, cooling, and ventilation through ducts into the space below. Many retail stores, offices, restaurants, and light industrial buildings in Calgary use them because they free up interior space and are relatively simple to service from above. See our overview of commercial rooftop units for more.
What Does Rooftop Unit Maintenance Involve?
Maintenance varies by manufacturer and model, but a thorough inspection commonly includes:
- Replacing or cleaning filters.
- Checking belts, bearings, motors, and fans.
- Inspecting heat exchangers and burners on gas-fired units.
- Checking refrigerant circuits, coils, and condensate drains.
- Testing thermostats, controls, and safety devices.
- Checking the roof curb, panels, and seals for leaks or damage.
- Clearing debris, snow, and ice from intakes and around the unit.
Timing matters in Calgary. A spring check helps confirm that cooling is ready before the first hot stretch, and a fall check helps confirm that heating is ready before sustained cold. A commercial maintenance plan helps make both visits routine rather than an afterthought.
Rooftop Unit Repair: Warning Signs and Repair vs. Replace
Signs that a rooftop unit needs attention include:
- Uneven temperatures or rooms that won’t reach setpoint.
- Short cycling (turning on and off frequently).
- New or louder noises such as squealing, rattling, or grinding.
- Ice on coils or water pooling around the unit.
- Rising utility costs without a change in use.
- Error codes or the unit locking out.
For rooftop unit repair decisions, a few factors help guide repair-versus-replace thinking: the unit’s age, the cost and frequency of recent repairs, the availability of parts, the condition of major components like compressors and heat exchangers, and whether the unit still matches the building’s needs. A trustworthy contractor should explain these trade-offs rather than defaulting to the most expensive option.
Industrial HVAC Repair in Calgary
Industrial HVAC repair is the diagnosis and repair of heating, ventilation, and cooling equipment in industrial settings such as manufacturing floors, warehouses, shops, and processing facilities. These environments tend to be harder on equipment due to dust, fumes, large volumes of air, and long run times.
Common Failures in Warehouses, Workshops, and Industrial Facilities
Examples of problems seen in industrial settings include:
- Warehouses: Unit heaters that fail to ignite, uneven heating from high ceilings, and cold floor-level temperatures that affect workers and stored goods.
- Workshops and fabrication shops: Fume and dust loading that clogs filters and fouls burners, and exhaust fans that outpace the available make-up air.
- Loading dock areas: Heat loss from frequently opened doors, which overworks heating equipment.
- Process areas: Equipment that must hold specific temperatures and that shuts down production when it fails.
- Mixed-use commercial and industrial buildings: Offices and shop space served by different systems that need to be balanced.
Because an industrial system failure can halt operations, response time and diagnostic skill matter. Our emergency repair service page explains how to reach us when a failure can’t wait.
What to Do When a System Fails
When heating or ventilation stops, a few steps can help while you arrange service:
- Check the basics: thermostat settings, power, tripped breakers, and a clogged filter.
- Look for safety concerns. If you smell gas, suspect carbon monoxide, or see smoke, leave the area and contact the appropriate emergency services and your gas utility.
- Protect what you can: move temperature-sensitive stock, and protect pipes from freezing during cold weather.
- Note symptoms and error codes to help the technician diagnose the problem faster.
- Call a qualified commercial HVAC contractor rather than attempting repairs on gas or high-voltage components yourself.
Commercial Heating Solutions for Calgary Businesses
There isn’t one best heating system for every Calgary building. These are the main options and where each tends to fit.
Unit Heaters and Tube Heaters
If you’re searching for a unit heater in Calgary, you’re probably heating a warehouse, garage, shop, or other large open space. Suspended unit heaters warm space directly and don’t take up floor area, while tube heaters distribute heat along a length of tubing. They’re common in industrial and utility spaces where full climate control isn’t required. Read more about unit and tube heaters in Calgary.
Radiant Heating
Radiant systems warm objects and people directly rather than heating the air. This can suit high-ceilinged spaces, loading areas, and buildings with frequent door openings, where heated air would otherwise escape quickly. A contractor can assess whether commercial radiant heating suits your layout.
Commercial Furnaces
Forced-air furnaces distribute heated air through ductwork and suit offices, retail spaces, and buildings that need consistent zoned heating. They’re a familiar technology for Calgary buildings, and proper sizing and regular maintenance make a big difference to reliability. See our commercial furnace page for more.
Commercial Heat Pumps
Heat pumps can heat and cool, and they’re increasingly considered for commercial buildings. Performance in cold weather depends on the specific equipment and design, and some installations pair a heat pump with supplemental heat. A design conversation early in the planning process helps avoid mismatched expectations.
Commercial HVAC Services in Cochrane and Surrounding Areas
Businesses outside Calgary have the same HVAC needs as those in the city, and often fewer local service options. Cochrane and the communities west and north of Calgary include retail centres, light industrial properties, agricultural and equipment buildings, restaurants, and growing commercial developments. For many of these, a service provider that is already familiar with the region’s climate and travel logistics can reduce downtime.
If you’re searching for commercial HVAC in Cochrane, confirm the provider’s service area, response approach, and whether they can handle the specific equipment in your building. Purcell Commercial HVAC serves Calgary and surrounding areas, including Cochrane where services are available.
Commercial Refrigeration in Cochrane
Food service and retail businesses in Cochrane depend on walk-in coolers, freezers, display cases, and other refrigeration equipment. For commercial refrigeration in Cochrane, watch for warning signs such as temperatures drifting out of range, ice buildup, unusual noise, short cycling, or higher energy bills. Quick attention to these signs can protect your inventory and help you meet food-safety expectations. Details are on our commercial refrigeration page.
How to Choose the Right Commercial HVAC Company in Calgary
If you’re comparing commercial HVAC companies in Calgary, focus on evidence of relevant experience, clear communication, and a service approach that fits how your business operates.
Questions Worth Asking Before You Hire
- Do they specialize in commercial and industrial work? Equipment, codes, and expectations differ from other types of HVAC work.
- Are their technicians and gas fitters appropriately licensed and certified in Alberta? Ask to see credentials for the work being done.
- Do they have experience with your equipment type, such as make-up air units, rooftop units, unit heaters, or refrigeration systems?
- How do they handle emergencies? Ask how to reach them and what response they can reasonably commit to.
- What does a maintenance plan include? Ask for the scope in writing, including inspection frequency and what’s covered.
- How do they explain quotes? A good contractor outlines the problem, the options, and the cost.
- Are they insured and compliant with workplace safety requirements? This protects your property and your liability.
Red Flags to Watch For
- Pressure to replace equipment without a clear explanation of what failed.
- Vague quotes or unclear scope of work.
- No verifiable credentials or insurance.
- Reluctance to explain the diagnosis or show you the problem.
- Promises that sound too good to be true, such as guaranteed savings with no basis.
Before comparing quotes, it helps to be clear on what you actually need: ongoing maintenance, one-time repair, or a design for new equipment. That clarity makes every conversation more productive.
Why Choose Purcell Commercial HVAC?
Purcell Commercial HVAC is a Calgary-based commercial and industrial HVAC service provider, founded in 2025. Our focus is on the equipment and buildings covered in this guide: warehouses, workshops, industrial facilities, retail properties, and other business facilities across Calgary and surrounding areas.
What that focus means for you:
- Commercial and industrial scope. Our services are built around business properties, from heating and ventilation to refrigeration, maintenance, repair, and system design.
- A full range of related services. From make-up air and rooftop units to unit heaters, radiant heating, and exhaust fans, one provider can look at how your systems work together.
- Local understanding. We work in the same climate you do and understand how Calgary winters affect heating and ventilation demands.
- Support from planning through repair. Whether you need system design and installation, a regular maintenance plan, or emergency repairs, you can work with one team.
Reliable heating, cooling, and ventilation protect your people, your inventory, and your operation. If you manage a commercial or industrial property in Calgary, Cochrane, or the surrounding area, contact Purcell Commercial HVAC to discuss maintenance, repair, or a new system. The best time to book a maintenance visit is before a breakdown, not after.
Frequently Asked Questions
What is commercial HVAC?
Commercial HVAC refers to the heating, ventilation, and air conditioning systems used in business and industrial buildings. These systems are generally larger and more varied than those in homes, and often include rooftop units, make-up air units, unit heaters, and exhaust fans.
How often should commercial HVAC equipment be serviced?
Most manufacturers recommend at least annual service, and many commercial buildings schedule inspections before both the heating and cooling seasons. Equipment that runs heavily or operates in dusty or fume-heavy environments may need more frequent attention. Follow your equipment manufacturer’s guidance and your contractor’s recommendations.
What is a make-up air unit and does my building need one?
A make-up air unit brings filtered outdoor air into a building to replace air removed by exhaust fans or combustion equipment. Buildings with commercial kitchens, shop exhaust, spray areas, or other significant exhaust typically need make-up air. Signs include hard-to-open doors, drafts, and poorly venting combustion appliances.
What are signs that a rooftop unit needs repair?
Common signs include uneven temperatures, short cycling, unusual noises, ice on coils, water pooling near the unit, rising energy costs, and error codes. If you notice any of these, have the unit inspected before a minor issue becomes a failure.
What type of heating works best for a warehouse or workshop?
It depends on the building, but suspended unit heaters, tube heaters, and radiant systems are commonly considered for large, open, high-ceilinged spaces. A contractor should assess ceiling height, insulation, door traffic, and how the space is used before recommending a system.
Does Purcell Commercial HVAC serve areas outside Calgary?
Purcell Commercial HVAC serves Calgary and surrounding areas, including Cochrane where services are available. Contact the team through nextair.ca to confirm service availability for your location.
Do you offer emergency commercial HVAC repair?
Purcell Commercial HVAC offers commercial emergency repair services. Visit the emergency repairs page or contact the team to learn how to request urgent service for your property.