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“Should I set my heating system’s fan to ‘auto’ or ‘on’ during the winter?” “Are there different rules for furnaces and heat pumps?”
These are two of our customers’ most frequent questions about keeping their homes cozy and comfortable during the colder months. The answer varies according to personal needs and preferences, but the choice is often clear if considering equipment efficiency. Expert heating services from Mattioni Plumbing, Heating, & Cooling include advising our customers on how to get the best performance out of their heating equipment.
Differences Between “Auto” and “On” Settings
The fundamental difference between the “auto” and “on” settings is that the fan runs continuously with the “on” setting, even if the heating unit shuts off.
- The “auto” function allows you to control how long the fan operates. Once the set interior temperature is reached, the unit and the fan stop. This ensures the fan uses the minimum amount of energy and helps it last longer due to fewer starts and stops.
- Fans set to the “on” function run continually, even after the desired temperature is reached, evenly distributing air and helping indoor air quality devices like UV filters and air scrubbers do their job.
There are advantages and disadvantages to both settings. For instance, setting the thermostat to auto prevents air from circulating when fans are off while running a fan continuously uses more power, which increases utility bills.
Which Fan Setting Is Best: “On” Or “Auto”?
While there are pros and cons to both settings for your furnace, here at Mattioni, we typically advise customers to use the auto setting, and here’s why.
The damage to your heating system by turning on and off is generally negligible and can usually be prevented with seasonal furnace maintenance. Also, your potential energy savings are substantial compared to your spending if your system runs continuously.
Heat Pump Winter Settings
The “on” versus “auto” debate differs for heat pumps, which have a variety of settings, including heat, cold, fan, auto, and dehumidify. When choosing a mode for your heat pump, keep in mind the following:
- It can be best to avoid the “auto” mode. Though it allows your heat pump to decide whether to heat or cool the space, it doesn’t always know best and might turn on the heat on a cool summer night or switch on the AC during a mild winter afternoon.
- You can avoid accidentally cooling during winter by using the “heat” mode and during summer by using the “cool,” “dry,” or “fan” setting.
Why Your Fan Setting Matters
The winter fan setting you choose significantly affects:
- How much money you spend
- How much power your HVAC system burns
- How often you need to change the air filter
It can also affect whether your home is heated evenly.
Choose Mattioni for Heating System Services
The bottom line? The best setting for your furnace or heat pump’s fan is the one that saves you the most money while keeping your home comfortable. You might also consider installing a smart thermostat that turns your furnace or heat pump on or off as needed.
For over 75 years, Mattioni has delivered furnace services to our Chester County customers’ homes, ensuring their heating systems keep everyone inside cozy and warm.
Contact us online or call us to schedule an appointment.
