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How long is your furnace on each day?

  • Last Updated:
  • Nov 22nd, 2019 9:27 am
Deal Addict
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Oct 9, 2010
2728 posts
904 upvotes
Windsor
Windsor, 1970s brick ranch, 1,250sq.ft, temps 20°C 6am->10:30pm and 17.5°C otherwise. Decent insulation (R50 attic, R24 basement walls and headers, R12 walls, double pane windows, decent attention spent on general leakiness), not a whole lot of random crap in the house generating waste heat.
2.5-3.5hrs/day (4hrs on Wednesday when it got down to -13°C)

Single stage "high efficiency" furnace, though I don't know the BTU rating.
One who is offended by truth, has no place among those who seek wisdom.
Sr. Member
Jul 24, 2019
648 posts
809 upvotes
Canada
Thanks for the thread OP
Gutty96 wrote: Ours runs from 5:30am to 6am and 4pm to 4:30pm right now.

Will increase in small increments as it geta colder.
Ours runs 600-630 AM, 500-530 PM and 900-930 PM

Another way to reduce the cost is to read the gas meter and phone in the reading on a monthly basis. We have saved $40/month over the years by doing regular readings. There is no guarantee that the gas company will use the reading for a particular month. This also saves on estimated readings on the gas bill.
Newbie
Mar 11, 2008
47 posts
38 upvotes
BC
The length of time a furnace runs in a day isn't really a useful comparison point between different houses. An oversized HVAC system will run less time per day than a properly sized one, but will likely use more energy and produce less even heat.
Member
Jan 19, 2013
496 posts
289 upvotes
Ottawa
This past January, 12hrs on cold cold days. Maybe 8hrs average as per ecobee.
Run time should be even longer now since I broke down and bought the communicating thermostat now
Hopefully I can get to run non stop on the cold days but likely it won’t as it’s oversized because they don’t make modulating furnaces smaller than 60k
B4768990-60C8-4BA3-89C4-E1025E4FC054.jpeg
4643FCED-AA54-4CD9-9111-F1F3980D6AEC.jpeg
Member
Mar 11, 2019
303 posts
177 upvotes
1chinaman wrote: This past January, 12hrs on cold cold days. Maybe 8hrs average as per ecobee.
Run time should be even longer now since I broke down and bought the communicating thermostat now
Hopefully I can get to run non stop on the cold days but likely it won’t as it’s oversized because they don’t make modulating furnaces smaller than 60k
B4768990-60C8-4BA3-89C4-E1025E4FC054.jpeg
4643FCED-AA54-4CD9-9111-F1F3980D6AEC.jpeg
Why are you trying to make your furnace run continuously?
Deal Fanatic
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Aug 16, 2010
6399 posts
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Aurora
We've had our Nest a couple of weeks now and I like the history feature, too. Looks like we're running an average of 3 hours a day. Max was a colder day when we ran 4 hours. Yesterday, (high of 7 outside), was a minimum at 1 hour.

Generally, when we're at home, we set the temp at 18 or 19. Sleep times and eco (away) times are 16. We're trying to wear more clothes rather than boost temperatures but who knows? If it gets uncomfortable, we'll raise temperatures.
Member
Jan 19, 2013
496 posts
289 upvotes
Ottawa
jintau wrote: Why are you trying to make your furnace run continuously?
Better comfort
Deal Guru
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Oct 23, 2008
10981 posts
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GTA, ON
How long your furnace runs will be dependent location, outdoor temperature, indoor comfort settings, size of home, size of furnace, type of furnace, insulation (both walls & attic), windows, air leakage, time settings.... Not sure how anyone's particular answer is going to help OP with a comparison.

For example, got a 2400 sqft 2 story (2005) with someone home all hours of day, set at 20.5C from 730am to 11pm, and 18 at night. Attic insulation has been beefed up to around R60. Windows are crap, and I'm sure I got air leakage all over. Current daytime high is 6, but over the last month, running between 3-4hrs. Yesterday only ran 2.5hrs, but has run as long as almost 5hrs during last week'a frigid GTA weather.
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Deal Addict
Feb 11, 2018
1361 posts
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chimaican wrote: How long your furnace runs will be dependent location, outdoor temperature, indoor comfort settings, size of home, size of furnace, type of furnace, insulation (both walls & attic), windows, air leakage, time settings.... Not sure how anyone's particular answer is going to help OP with a comparison.

For example, got a 2400 sqft 2 story (2005) with someone home all hours of day, set at 20.5C from 730am to 11pm, and 18 at night. Attic insulation has been beefed up to around R60. Windows are crap, and I'm sure I got air leakage all over. Current daytime high is 6, but over the last month, running between 3-4hrs. Yesterday only ran 2.5hrs, but has run as long as almost 5hrs during last week'a frigid GTA weather.
If you really want to know if your windows are crap, or what else is wrong, then get a thermal imaging camera. You won't be guessing anymore... Over time it will pay for itself.
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Member
Feb 3, 2012
259 posts
100 upvotes
T.O.
So far this month, I'm probably ~2.5 hours a day (see attachment).

Home: 1200 sq ft old Toronto semi-detached brick. Open concept living room and kitchen. Plaster walls without insulation, old double pane windows, and below average attic insulation.
Heating system: Gas boiler 75k BTU 28 years old and 7 cast iron radiators.
Temp Settings: 19 in the morning, 20 at home, and 17 away and sleep. 1.1 degree temperature differential.
Schedule: Mornings 6am to 8:30am, Work 8:30am to 3pm, Home 3pm to 9:30pm, Sleep 9:30pm to 6am

The boiler doesn't run frequently as the cast iron radiators holds a lot of heat and gradually gives it off. I set the temperature differential longer since my family is ok with a 1 degree swing and I want to reduce the frequency of the boiler turning on/off.
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Last edited by sputnik99112 on Nov 22nd, 2019 10:32 am, edited 2 times in total.
Sr. Member
Jun 14, 2009
564 posts
73 upvotes
Toronto
On a related note: just wondering since I am a bit confused with which setting to run my furnace, truth be told....

Is it better for a furnace to run, more frequently, eg 10-12 minutes to maintain a certain temp, for example at a set temp of 19C -- the furnace may run, say 2x within one hour (total run time 20-25mins within the hour), OR have it run longer, say 40-50 minutes and have it fluctuate all the way down to 16-17C and have it on for 45 mins again to return back to 19C, and back to 17C, run it again for 45mins back to 19C and so on... I don't really care for gas costs as it's cheap, but would want my furnace to last longer...

FWIW, right now, my setting is, setback from 9pm-6am (manually turn the thermostat to a lower setting)... it runs a long time in the morning at 6am to whatever until it reaches a temp setting for the morning prior to us leaving the house, then it's pretty much off the whole day till 7pm again when we're back home...

Many thanks

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