Categories

Should I leave the fan running on my high efficiency furnace?

Question Icon
Posted by: from Calgary
10/18/2014 at 11:40:53 AM

Does leaving the fan on all the time cost a lot and is it worth it?

REPLIES (1)
User Icon
Robert from Electrilight Ltd. in Oakville
Date/Time10/18/2014 at 2:29:39 PM

It depends on the speed of the fan and size of the motor. The faster the speed, the more wattage it consumes. Imagine the gas peddle in your car, drive 50 km/hr for 10 hours, you'll consume less than if you were driving 200 km/hr in that same 10 hours. (forget counter wind, friction, hills, traffic, etc)

Most furnace motors can be run at a fraction of the speed to circulate the air to prevent hot or cold areas and removing odors or moisture as well, depending on how the ducting is run.

You could be safe to assume running a fan motor at high speed would consume about 800 watts (8x 100 watt light bulbs for ease of understanding), and low speed may consume 200 watts. So to calculate, you need to know your KW/hr pricing. If it is $1.00 / KWhr, it would be 1000 watts (1 KW) consumed in 1 hour = $1.00. So you have 800 watts during 1 hour, it would be $0.80 for that hour, 200 watts on low speed for 1 hr = $0.20. So over a 24hr period, would cost you $4.80, 7 days = $33.60, 365 days = $1752.00. But that is with $1 rate per hour, which is not accurate as most rates change during daylight, nights, weekends, etc.

Best to program something to be off during peak rates, run at 40% during the cheapest times (nights and weekends)

Hope that helps.

Search the TrustedPros directory and discover the best contractors in your area.

Find your home service pro
Great renovations start with a great contractor.

Since 2004, TrustedPros has been helping homeowners find the right contractor for their home improvements and repairs.

Post Your Project

Within hours you'll be comparing offers from top-rated professionals. It's free to post and you're under no obligation to hire.

 
Trustedpros Inc. does not warrant the accuracy, completeness, safety, legality or usefulness of any Content, or Whether Content is Current and up-to-date, and TrustedPros Inc. Shall have no liability whatsoever with respect to your use or reliance upon any content or for content being removed or otherwise ceasing to be available. Please refer to the terms and conditions of use of this websites for more details.
Categories

It appears you may be located in the US

TrustedPros is designed to deliver results targeted to your location.

Get Free Estimates

Post your project and compare offers from top-rated pros.


x