Should I run my fan continuously in summer?

Running your fan continuously in summer can provide better air circulation and comfort, but it comes with trade-offs in energy costs and filter replacement frequency. The decision depends on your specific comfort needs, home layout, and energy priorities.

Continuous fan operation helps eliminate hot and cold spots throughout your home by constantly circulating air. This is particularly beneficial in Ottawa's humid summers, as moving air feels cooler on your skin and helps maintain more consistent temperatures between floors. Many homeowners find they can set their thermostat 2-3 degrees higher while still feeling comfortable, which can offset some of the increased fan energy costs.

The main drawbacks are increased electricity usage and more frequent filter changes. Your fan motor will consume an extra 300-600 watts continuously, adding roughly $30-60 to your monthly hydro bill in Ontario. You'll also need to change your furnace filter every 30-45 days instead of every 90 days, since it's working constantly to clean the air.

For Ottawa homes with multiple levels or rooms that tend to get stuffy, continuous fan operation often provides noticeable comfort improvements. However, if your home already maintains even temperatures and you're focused on minimizing energy costs, using the "auto" setting where the fan only runs during cooling cycles may be more economical.

Consider your air conditioning system's age and efficiency as well. Newer variable-speed fan motors use significantly less energy than older single-speed models, making continuous operation more cost-effective. If you're unsure about your system's efficiency or want to explore options like a programmable thermostat with smart fan scheduling, a professional assessment can help you optimize both comfort and energy usage for your specific home.