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Old 03-03-2019, 06:39 PM   #16
Trihexagonal
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Quote:
Originally Posted by enorbet View Post
Yo Trihex, using an oven to heat a home is inefficient and bad for the oven. Spend 20 bux and get yourself a space heater. As for power hungry towers, that doesn't apply to all towers. It is dependent on the efficiency of the PSU. My 800 watt PSU powered tower drops to less than 30 watts when in deep hibernation.
I'd be more afraid of setting the place on fire with a space heater than having the oven door open to heat and getting burned or burning it out. I've been doing it the 11 years I've lived here and mostly bake or broil instead of frying food. If it dies Management will have one here the same day and replace as needed as regular business procedure. My kitchen is connected to the living room so it does a big part of heating a small apt.

I had two old Dell towers with a P4 I used for a pfSense router/firewall and OpenBSD box. That was half my electric bill at $40 in the summer and I leave 3 laptops and TV on now as standard practice.
 
Old 03-06-2019, 01:38 AM   #17
darksaurian
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uh... just so we're all clear there's no such thing as a more efficient electric heater. I never suggested leaving light bulbs on could save money or be more efficient. I was wondering if it would make zero difference as far power consumption is concerned. Forget light bulb cost or whatever. I'm still of the opinion it makes no difference unless somebody runs my double house test and proves otherwise.
 
Old 03-06-2019, 07:18 AM   #18
ntubski
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Quote:
Originally Posted by darksaurian View Post
I'm still of the opinion it makes no difference unless somebody runs my double house test and proves otherwise.
My prediction is that only bulbs next to the thermostat would have any effect. Please run a double house test to prove me wrong.
 
Old 03-06-2019, 08:25 AM   #19
michaelk
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A typical 1500 watt heater can warm a room of several hundred square feet. In very rough numbers, if an incandescent light bulb outputs 70% of its energy as heat that would mean you would need ~20 100 watt light bulbs to heat the same area.

Leaving all the lights on would add a small amount of heat in the immediate area of the bulb itself but not significantly add enough heat to keep the furnace from running. Therefore the power consumption would increase.

Last edited by michaelk; 03-06-2019 at 08:49 AM.
 
Old 03-06-2019, 08:37 AM   #20
sevendogsbsd
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Interesting thread so I'll bite...my house is 3000 square feet. We have LED bulbs in all fixtures and my wife and I turn off every light in every room we are not in. We have 2 separate AC units (upper, lower floor) and 2 separate heaters (gas). Electric bill running gas and the blower to move the air in winter is $100. Summer running the air conditioning 24/7 for 9 months out of the year rarely hits $300.

I have a router, a hardware firewall, a switch, a cable modem and a "gateway" for the TV, plus a voip adapter that run 24/7, plus all of the other various smart devices that are on 24/7.

Heat from bulbs in lights is, as others have posted, not even remotely enough to heat a room enough to offset a heater designed to heat a room.

I guess I have an energy efficient home, plus my wife and I are conservative about it.
 
Old 03-06-2019, 08:41 AM   #21
rtmistler
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All my bulbs are LED.

While they produce heat, it is far lower than incandescent bulbs.

Given that we're seeing single digit Fahrenheit temperatures, I'm not really thinking a light bulb would do anything significant.

Feel free to run your dual house experiment. Unfortunately I only have one so I can't help you.

A more interesting conversation was with my plumber when he talked about the trend in regulations requiring replacing large electric water heaters with hybrid ones. Typically in a lot of US (probably Northern) areas, there are basements where the furnace, or boiler goes, along with an oil tank, water tanks for wells, and a water heater, if you don't happen to use what we call an in-direct, from the boiler. All in all, sounds like a pretty good idea. Be more efficient an all. Problem is, there is very little ambient heat down in basements, it all dissipates from the furnace or boiler. And to further that problem, a hybrid water heater uses that ambient heat to aid making hot water. Great. Now the under neath of the house is entirely cold, so as to make sure there is efficiency with heating your water. That former heat, had one place to go, upwards into the flooring of your first level. Now that first level has only the insulation, and the fact that the basement is enclosed, protecting it from freezing entirely. Guess what also sits in the risers in the basement? Your water supply pipes. Less ambient heat down there means they can experience more cold temperatures. Simple tip for those who may run afoul of 1/2" copper freezing up. Look to the elbows first, they seem to be the most susceptible.

Edit: I see as far as lighting goes, sevendogsbsd is thinking along the same lines as me. We also have a solar array on the roof, which generates far more electricity than some light bulbs use. Why not also take the heat dissipation coil from your refrigerator and see about taking the heat from that?

Last edited by rtmistler; 03-06-2019 at 08:43 AM.
 
Old 03-06-2019, 09:25 AM   #22
enorbet
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Some here seem to be missing the point. Heating a home is like adding water to a leaky bucket. Two drops per minute won't help if you're leaking 100 drops per minute. So the point is nobody can make a generalization about how Home heating costs are affected by leaving lights on when neither Lights or Homes are definitively defined.
 
Old 03-07-2019, 12:52 PM   #23
ondoho
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Quote:
Originally Posted by rtmistler View Post
All my bulbs are LED.
oh crud, we never even asked op what sort of lighting they refer to.
when i hear "bulbs" i sort of assume the old, very inefficient type (not for sale anymore in my country).
the whole discussion would be very different if they were talking about LEDs.
Who knows, maybe they're too young to remember anything else.
 
Old 03-07-2019, 01:02 PM   #24
273
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As a thought experiment I refer to enorbet's post.
As a real-world idea -- I'd say I probably agree that, if you're heating your home to a fixed, high, temerature all the time then lightbulbs are probably irrelevant to the costs you're incurring.

Last edited by 273; 03-07-2019 at 01:04 PM.
 
Old 03-07-2019, 01:05 PM   #25
dugan
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Quote:
Originally Posted by darksaurian View Post
if all the energy used by the light bulbs gets turned into heat
No, not all of the energy used by a light bulb get turned into heat. Some of it gets turned into light.

Last edited by dugan; 03-07-2019 at 05:51 PM.
 
  


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