Why rooftop units
A rooftop unit packages heating, cooling and ventilation in one cabinet on the roof. It frees interior space, simplifies service access and is common on retail, office and light commercial buildings across Western Canada.
A single large building may use several units, each serving a zone. Zoning lets different parts of the building be heated or cooled to suit their use.
Replacement or new install
Replacing an old unit looks simple but rarely is. The new unit may be larger or smaller, with different dimensions, weight and connection points. We check the roof curb, the structure and the ductwork before ordering. Adapter curbs are sometimes needed.
Roof structure matters. New units must be supported without overloading the roof. Our engineers confirm loads, and we coordinate with roofing so the membrane is protected and warranties are respected.
The lift and the connections
- Crane planning, road or lane closures and permits as needed
- Setting the unit on its curb with proper seals
- Duct and pipe connections
- Power and disconnect by HSM's electricians
- Controls wiring and thermostat or building automation connection
- Gas connection by our own gas fitting crew where applicable
- Start-up, refrigerant checks and airflow verification
Alberta conditions
Winter replacement is possible but needs planning. Cold temperatures affect sealants, roofing and crane operations. If a unit fails in January, temporary heating can bridge the gap while the replacement is ordered.
Units on Alberta roofs deal with snow, wind and wide temperature swings. We include snow guards, wind restraint and freeze protection where the design calls for them.
Planned replacement is cheaper than emergency replacement. If your units are near the end of their life, we can help you stage the work over a few budget cycles. Our mechanical maintenance team can also inspect existing units and give you an honest view of their remaining life.