In a moderate climate, a small residence may only need a source of what for odour control?

In a moderate climate, a small residence primarily needs a source of heating and ventilation for effective odour control. Heating helps to maintain a comfortable temperature during colder months, while ventilation is crucial for ensuring adequate air exchange within the home. This air exchange helps to remove stale or odorous air and replace it with fresh outdoor air, thereby minimizing potential odours that can accumulate in enclosed spaces.

In this context, the combination of heating and ventilation works together to promote indoor air quality. Proper ventilation can reduce humidity and ensure that any odours from activities like cooking or pets are effectively diluted and carried out of the living space. This is particularly important in homes where air might become stagnant without proper circulation.

Other options that emphasize cooling, filtration, or dehumidification may address specific indoor climate control aspects but do not directly target odour control in the same way that heating and ventilation do.