You need to consider that some walls may contain water pipes. Not having those warmed up sufficiently could lead to a bursted pipe, which could lead to significant damage.
Also keep in mind that keeping your house below 15C can cause damp issues.
MMMMM Mold.
Whats the min temp to be responsible but also keep the central heat waste to a minimum?
Cautionary tale:
For us it was trial and error. We thought we were doing pretty well by keeping track of the weather and balancing the whole house heating vs single room. Until we had a snap freeze that plummeted the temps overnight to an obscene degree. We were comfortably warm in our bedroom as all the pipes in the kitchen and bathroom were bursting.
10’s of thousands of dollars in demolition and reconstruction later we have decided that in this instance it’s better to waste some small amount of energy keeping the whole house heated rather than risking another catastrophic failure.
Your mileage may vary.
Fwiw, most modern thermostats have an emergency failsafe temp setting that will always turn the heater on when reached, even if inadvertently set lower by mistake. Saved my bacon in a rental once.
As a side note, if you for some reason turn off the central heating entirely and just use space heaters, then the failsafe will do no good.
Most central heating solutions waste some energy when idling, so one might be tempted to turn them off. Please be careful when doing this.
This was a solid case of “if it ain’t broke don’t fix it” the thermostat and heating system in question was from the 60’s or 70’s and had served us with no issues for as long as we had been there. Hindsight 20/20 and all that jazz.
Fwiw there is low power heat tape you can buy to run along pipes to keep then from freezing. Had this on a pipe that ran through an attic and would freeze when the outside temp got extreme, despite heating the house.
55F / 13C
Generally, 55-60 Fahrenheit (13-16 C) should be safe. If you have mild winters and a house layout that isn’t too spread out, you may be able to set it as low as 45 F (7 C).
That depends on the plumbing and how cold for how long it is in the area. Also, going too cold isn’t good on the house, either. Drywall and wood don’t like all the temp swings, either.
Winter can be quite harsh where I live, and 16°C is the recommended minimum temperature.
Adding to what others have mentioned, you probably don’t use the same type/source of heat for the full house. A typical space heater is resistive heat, which is simply turning electrical energy into heat energy (at 100% efficiency). Your central heat could be a Gas-powered furnace (converting chemical energy to heat energy at ~90% efficiency), heat pump (converting electrical energy to heat at 300+% efficiency), or a few other options.
In my area, gas is much cheaper per joule than electricity. it ends up being the same price to heat the entire place with gas as it would be to heat just a room with an electric space heater. If I were to use a kerosene space heater, or a heat pump, or whatever else, then the numbers would change.
Yes, basic math says it uses less energy to heat a smaller area than a larger one. But that’s assuming the same type, cost per unit, and efficiency. This is unlikely unless you have the worst option on both (resistive electric heat)
Lovely reply; this is not the simplest answer but it’s the truth.
Buying gas is way cheaper than buying electricity; however, if your electric grid contains any significant portion of carbon-zero producers (hydro, nuclear, solar, wind), using electric space heater will emit less CO2 than gas furnace, for the same amount of heating. If you care at all about CO2 that is. This is the main reason why burner heaters have been so difficult to replace - we thought we could price our way out, let market forces pull us gently into a renewable future without having to make personal sacrifices, but gas is just so much cheaper it’s tough to give up.
An electric heat pump will just about break even on cost with gas, while giving even greater CO2 savings. Annoyingly, a gas-powered heat pump will still be cheaper.
Please consider moisture (=mold) depending on humidity levels where you are. For example if you have one warm room the air will cool on the uninsulated interior walls to the next room, cooler air can not contain the same amount of humidity so this will condensate on (or in!) your walls. This is a good way to grow mold and get all kinds of expensive health issues.
You may not use the space, but you likely have water lines that can’t handle freezing temps, and other electronics/appliances that assume living space (non condensing humidity being important)
Now, setting your thermostat lower and only heating the room you’re in? Maybe. Whole house systems are damn efficient, so if you’re moving around the house with the heater, that’s a no go, but if you hang out in one closed door room, it’s an experiment you might want to try.
Expect the bathroom to be colder than you’d like if you’ve spent the day in your bedroom/office.
I actually think its really good for sleep too for it to be a bit hibernation-level chilly in an ambient sense.
My muscles clench up when I try that, which makes my back problems worse.
Is there a treatment [dont mean medicine] or discussion on this topic you would recommend, thats interesting. Something, something, muscle spindle fibres?
Depends on the efficiency of the heater but, as long as the space is enclosed, almost certainly yes.
Keep in mind that your interior walls aren’t insulated, so you’ll lose some of your heat to other rooms, probably causing higher-than-expected usage. Along with the bursted pipes, which have already been mentioned, I’d be also concerned about interior temperature gradients and condensation, and resultant mold and mildew issues.
Just to add something: water pipes freezing can be made less likely by leaving the water flowing slowly out of a faucet. Moving water does not freeze as easily. While I wouldn’t use this as any kind of regular protection, it can help buy you that extra peace of mind when you’re probably fine, but still slightly worried about a particular cold snap.
Interesting if not super applicable/practicable (I hate waste, love dripping sound tho lol. Very conflicted)
It took me a looooooooong time to realize that trying to minimize waste in “clever” ways (i.e. “why do people do X, it’s so wastefull!”) actually ended up being more wastefull in the long run because by doing so I was impacting other things I didn’t understand.
My suggestion: don’t try to be clever, or original. Do some serious research and talk to people before embarking on these journeys.
Housing for example is built making a ton of expectations, such as the expectation that the space will be heated. When it is not, you risk problems, starting with freezing pipes, sure, but also expansion/contraction and humidity issues (too much, too little), which can lead to all kinds of problems, including mold growth, cracks in walls, buckling floors, shifting structure, and many other things I don’t understand.
You should talk with an HVAC expert before experimenting on your house.
In older stick frame homes, it’s not just practical but essential. They were built to breathe, unlike modern designs. That means that even if you’re keeping the entire house warm you could still experience burst pipes.
Several years ago, I had a very lucrative, outdoor job over the winter. Between acclimating to the cold and long underwear, I would be roasting in “room temperatures”. I lived alone, and was only home weekends and about 6 hours a night.
I turned my thermostat down to 50F, put an oil-filled radiator-style space heater on a timer in my bathroom, and a heated mattress cover on my bed.
Yes, you can save an ass load of money on heating bills.
If you have plumbing in exterior walls, you need to be careful. I had to leave the cabinets under my kitchen sink open to get some heat back to the pipes.
Is there a quick+dirty F -> C conversion? I know its something something * 0 + 32 or some shit but I’d love a super loose rule or affirmation of that if you know
The full formula is (F-32)*(5/9).
I have difficulty multiplying by 5/9 in my head, so the quick-and-dirty option is to subtract 32 and simply divide by 2.
50F - 32 = 18, divide by 2 = 9C (compare to actual value: 10C)
Very good :)
Keep all rooms safely above freezing, +10 Celsius/ +50F and only heat one room warmer. Calculate the power/fuel you would use then and compare to full central heating (it can be different for every location). Generally speaking in many countries running something that heats or cooles rooms with electricity 24/7 will make your power bill skyrocket. Damage to property caused by the cold like burst pipes and other stuff can certainly cost you any savings made and more.
All these people talking about mould and freezing pipes, and so on, and I as an Aussie am deciding I’m totally out of my depth. An observation; We get only a few days of snow in winter every year. Our pipes don’t freeze, our houses don’t get mould from this. If you aren’t in a cold enough to freeze the pipes type place, perhaps do what Aussies do and heat only one room in the house, it’s fine.
