Replacing HVAC equipment in a commercial building
Commercial HVAC replacement makes sense when equipment is near the end of its service life, repair calls are frequent, energy use keeps rising or parts and refrigerants are becoming hard to source. The best results come from planning the replacement before a breakdown forces it, and from sizing the new system to the building as it is now.
When should commercial HVAC equipment be replaced?
Age is a first filter. Many rooftop units and boilers run for fifteen to twenty years or more with good maintenance, though lifespans vary by equipment type, climate and use. Our guide to heating system lifespans in Canada gives typical ranges for residential equipment, and manufacturers' documents give figures for specific commercial models.
Other signals matter as much as age.
- Repair calls that return every season, and rising repair costs against a replacement quote.
- Tenant or staff complaints about hot and cold spots, noise or stuffy air.
- Energy bills climbing for the same occupancy.
- Parts that are discontinued, or an older refrigerant that has been phased out and is costly to handle.
- A cracked heat exchanger or a failed compressor on an old unit.
The decision logic is the same as for a house, covered in the repair or replace decision guide.
How do you plan a replacement?
Begin with a condition assessment of all equipment on the building and a replacement schedule. That lets the owner budget for several years instead of reacting to each failure. Check what the building needs today: occupancy, lighting, windows and insulation may have changed since the system was installed. A fresh load calculation, as described in heat loss calculation in its residential form, often shows that the old size is too big.
Then decide the scope. Like-for-like replacement is the quickest. A higher-efficiency unit costs more and lowers running costs. A change of fuel or technology, for example to a heat pump, needs more design, as outlined in commercial heat pump installation. For boilers versus furnaces in general, see boiler versus furnace.
What compatibility issues catch people out?
- Curbs and mounting. A new rooftop unit may have a different footprint, weight or duct connection than the one it replaces.
- Electrical. Voltage, phase and breaker sizes must match, and a higher-efficiency or heat pump unit can draw differently.
- Controls. Thermostats and building automation must work with the new equipment's communication and sequences.
- Ductwork and piping. Existing distribution may need repair, cleaning or rebalancing.
- Gas and venting. Condensing equipment needs drains and different venting.
- Roof and structure. Crane lifts, roof penetrations and added weight need checks.
Ask each bidder to list these items in the scope, so that surprises do not appear as change orders later.
How do you phase the work and compare quotes?
Equipment lead times can run to weeks or months, so order early and aim for the shoulder seasons, when heating and cooling loads are lighter. Replace in phases if the building has several units, which spreads cost and keeps part of the building comfortable during the work. Schedule installations outside peak occupancy where possible, and plan the crane lift and roof access with the property manager.
Compare quotes line by line: equipment make and model, capacity, efficiency rating, controls, permits, disposal, commissioning and warranty. The approach in how to compare heat pump quotes carries over to other equipment. Costs depend on size, type, access and region and change from year to year, so written quotes decide. After the install, ask for a commissioning report, and consider a service plan; the trade-offs are discussed in whether an HVAC service contract is worth it.
What does Drake Landing show about end of life?
Drake Landing Solar Community in Okotoks, Alberta, ran its Energy Centre, tanks and controls for years, but from about 2020 deterioration and maintenance problems accumulated and the system was wound down, with decommissioning from 2024. The Energy Centre page describes the plant. The point for any building owner is the same: a replacement schedule and a maintenance budget keep a system out of crisis mode, and an end-of-life plan should be part of the original design. Check any current funding for equipment upgrades with the Government of Canada energy pages, your provincial energy ministry and your utility.
Quick answers
How long does commercial HVAC equipment last?
Many rooftop units and boilers run fifteen to twenty years or more with regular maintenance, though it varies by type, climate and use. Check the manufacturer's documents for your model.
Should I repair or replace an old commercial HVAC unit?
Replacement tends to win when the unit is near the end of its life, repairs are frequent or costly, or parts and refrigerant are hard to get. Compare the repair quote with the cost and savings of a new unit.
Can I replace HVAC units one at a time?
Often yes. Phasing spreads cost and keeps part of the building comfortable, but plan the controls and electrical work so the units work together.
Are there incentives for upgrading commercial HVAC?
Some federal, provincial and utility programs exist for efficiency upgrades, and terms change. Check current offers before signing a contract.