Start with the home, not the equipment badge
A useful installation proposal should explain how the recommended cooling capacity fits the home. Floor area is only one input. Insulation, windows, orientation, air leakage, existing ductwork, and the rooms that are hardest to cool can all affect the recommendation. Ask the contractor to explain the sizing method and what assumptions were used rather than accepting a replacement based only on the old unit’s label.
Central air or ductless cooling?
Central air uses the home’s existing forced-air duct system and one or more thermostats. Ductless equipment uses individual indoor units connected to an outdoor unit and can be useful where there is no suitable ductwork or where a specific area needs separate control. Neither format is automatically better for every house. The practical choice depends on the existing heating system, duct condition, electrical capacity, layout, noise preferences, and how many rooms need cooling.
Confirm Calgary permit responsibilities
The City of Calgary’s current contractor guidance lists central air conditioners as requiring electrical and mechanical permits. The City’s heating and cooling guidance also notes that air-conditioning equipment may require planning review depending on location and property conditions. Permit scope can change with the project, so confirm in writing which permits apply, who will obtain them, and how inspections will be scheduled before work begins. Review the current electrical permit guidance and mechanical permit guidance for the authoritative requirements.
Read efficiency labels in context
Natural Resources Canada lists federal energy-performance requirements by central-air-conditioner type and manufacturing date. For many standard split-system central air conditioners under 19 kW, the current table shows a minimum SEER2 of 13.4, while space-constrained and small-duct systems have different categories. A rating should be compared within the correct equipment type. Higher efficiency can be valuable, but comfort also depends on sizing, airflow, controls, installation quality, and how the system is used. See NRCan’s split-system central air-conditioner requirements.
What a complete proposal should explain
A clear proposal should identify the equipment, cooling capacity, indoor and outdoor components, electrical work, refrigerant-line routing, condensate handling, thermostat or control changes, permit responsibility, commissioning steps, warranty terms, exclusions, and total price. It should also explain what happens if the existing ductwork or electrical service needs additional work. Compare scopes, not just headline totals, because two quotes may include very different work.
Questions to ask before approving the work
Ask how the system was sized, what permit and inspection steps apply, whether the electrical service was reviewed, how airflow will be checked, where condensate will drain, what commissioning readings will be recorded, and which parts of the quote could change. If the home has no ductwork or one area remains difficult to cool, ask for a central-versus-ductless comparison. A useful contractor should be able to explain the recommendation in plain language before asking you to commit.
