Think of your house as a composition of various different components that work together to form a single interdependent system. Heating, cooling, and ventilation components, along with the construction materials and people that live in the house all interact to form this interdependent system. Changes made to one component of a house can affect other components.
For instance, if your house is cold or drafty it is recommended that you eliminate air leaks from the buildings envelope before investing in a high efficiency furnace. Otherwise, the furnace will be constantly running just to maintain a comfortable temperature level.
New high-efficiency windows won’t prevent condensation problems if they are improperly sealed or insulated, the humidifier on the furnace has not been adjusted or if kitchen and bathroom exhaust fans are rarely used or are improperly ventilated.
A properly functioning home incorporates air tightness and good ventilation. Have an NRCan certified energy advisor test your houses’ system for energy efficiency. Any recommendations made will always consider the “house as a system” concept.