this post was submitted on 30 Jan 2024
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Does anyone know a way of calculating the energy needed to heat a home/room? (feddit.uk)
submitted 1 year ago by rmuk@feddit.uk to c/homeassistant@lemmy.world
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Does anyone know a way of calculating the amount of heating I need to maintain an average temperature in terms of kWh of heating per 24 hours? Ideally one taking into account weather conditions.

I have a pretty big Home Assistant setup which includes switches for individually controlling all the (electric) heaters in my home. I'm also using an electricity supplier that changes the amount they charge every 30 minutes to reflect supply and demand. Given these rates are published at least 24 hours in advance I can currently choose a number of hours to run the heaters per day and have an automation automatically select the cheapest periods. I'm paying less per kWh for heating than I would if I was using a gas boiler. Plus, it's all from renewables, so working out that number of hours is the next step.

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[โ€“] lorentz@feddit.it 0 points 1 year ago (1 children)

I've used https://www.bestheating.ie/btu-calculator to decide the power of my new boiler, so far it is working well. But as other said, this is likely a very rough approximation.

[โ€“] rmuk@feddit.uk 1 points 1 year ago

Thanks, I gave that a go and it actually came up pretty close to the numbers I already had (after converting BTU to kWh anyway) so that was a useful sanity check, thanks!