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    Construction Performance Guidelines

About the Guidelines

These helpful guidelines outline work and material deficiencies in new homes and residential condominium units covered under the statutory warranty [...]

Inadequate Cooling

Article Number




Acceptable Performance/Condition

Cooling systems shall be capable of maintaining an indoor air temperature of 24°C at the design temperature for the geographical location.


One-Year - Work and Materials. Two-Year - Delivery and Distribution Systems Defects in materials, design and work supplied by the homeowner, and damage resulting from improper maintenance, or from alterations, deletions or additions made by the homeowner are excluded from the statutory warranty.


Where builder-supplied and installed appliances, ductwork and piping do not meet the acceptable performance, repairs shall be made.


Sustained high outdoor temperatures exert large loads on cooling equipment; indoor temperatures will rise until outdoor temperatures return to design levels. Skylights and large window areas can allow sunlight and heat to transfer easily into the home. Temperatures tend to vary in a multi-storey home due to normal air movement patterns. Heat gain calculations and duct designs assist in determining the equipment size and adequacy of the cooling system. Cooling is not a requirement of the Building Code. See Also: 8.8 HEATING, VENTILATING OR AIR CONDITIONING (HVAC) SYSTEMS NOT INSTALLED PROPERLY 8.16 AIR CONDITIONING COOLANT LINE LEAKS