Marvin

There I think is the catch. Didn't think you could make helium....

Thanks - these are useful figures to know. Yes but remember this is with, I think, 200mm PIR insulation underneath the floor.

Alot of big decisions depend on how long you intend to stay where you are. In my humble opinion I think it would be a good idea to really understand how an MVHR works in reality. Ours for 100m2 floor area runs at about 20watts. So 0.48kWh a day. What it saves on heat alone is alot during the cold days. When the air was 5C outside the heat exchanger was warming the fresh air to 19C Our one comes on when the house is too humid as well. It all looks good. Good luck with your home improvements (no pun intended). Marvin

Welcome @Crowbar hero As a basic, it's worth considering all the AIM APE elements at this stage, before making decisions. That is Airtightness, Insulation, Mechanical Ventilation with Heat Recovery, and Air Source Heat Pump, Photovoltaics and Electric Vehicle. You may not consider all of these, but when talking about saving energy on heating the first three make good long term choices However some of these will not work properly without the others: A MVHR will not work properly without Airtightness. An Air Source Heat Pump will have to compensate for the lack of Airtightness and Insulation to the degree that the benefits become questionable, especially during winter, without them. An ASHP uses electricity and Photovoltaics can supply a little during winter and a lot during summer when cooling can be a problem and an ASHP can supply cooling. PV can supply a little to an Electric Vehicle during winter and plenty during summer if your vehicle is at home during sunny days. So if finances cause you to have to consider only a few in my humble opinion AIM first and go APE later. Good luck with your project and remember the only daft question is the one you didn't ask and don't expect a good answer to your question unless you supply enough information. Marvin

I would be concerned about condensation via bathroom and kitchen air.

Your right, a long time. I think about 10 years, if we're still all here. Minimal grid dependency is of course the sensible choice. I think of an EV as a mobile battery and wonder if in the future the power in the car cannot be reversed into the house when needed, obviously within certain limits, storing power when excess and using when required. I think the EV we are waiting for will hold about 80kWh. If so I will have to upgrade my 13amp charging cables! ?. Although, even with this idea, we still could not last the winter out, which is a shame as our PV will supply all our power for the year, just not at the time we need it.

I'm preparing the bungalow for off grid.

I wanted a pir sensor for the ensuite so during the night putting the light on didn't wake everyone with the annoying click. When I read how much power the sensor used I installed a double pull switch and a half watt orange Led which comes on when the lights are out. The benefit with this is that in the dead of night you don't need much light to see and it runs at about 1/10th of the energy for a PIR.

Could be a leaky loft hatch..... People buy by form, and suffer with function. Looks great Actually a sack of s...

Loft extension leaking heat..

Yes The good news is that the payments will pay for all the parts and commissioning. the rest was my labour. FYI at present we are using about 9 kWh on all heating and partially hot water ( some via PV) a day. F

Yes we were pissed and it actually went down from the previous EPC rating. We're an F for F sake. But hay up the payments! Assessor said main problem was Bottled gas boiler scores verrrrry low. but no mains gas here.

We had the same. Neighbours spend £1500 on heating over winter; us with our bottled LPG boiler spent £560. Neighbours no floor insulation, no wall insulation and 300mm fluffy! And No. he didn't "do it" the EPC system is S***

Sounds like they got in first and took up all the spare capacity. This will be a lesson for people going forward.....

Er. not sure. Wont 4kW burn out the 3.6 inverter? I have 5.12kW and a 6kW inverter

Well 35 degrees ish. However it depends if you want the money or winter power as they are usually fixed position.

Well this is a problem because there is no recognition of the possibility of misconstruing someone who is constipated. The boost could end up staying a on a month. I think that as the problem is the smell, the sensor must recognise an unpleasant smell.

Its a right hassle. unless you have a sun guided system. If the wind gets behind the panels they can be damaged. I know that panels set up here at 18 degrees off vertical will produce the most PV over December and January. Expected typical result on my 5.12kW PV : 152kWh in December and 162kWh in January on 23 degree roof. Expected typical result on my 5.12kW PV : 222kWh in December and 222kWh in January at 78 degrees. So a 46% increase over the winter, and of course a decrease if left over the summer. That would equate to about 2 kWh extra a day. https://re.jrc.ec.europa.eu/pvg_tools/en/tools.html If you want to use the above tool, first zoom in on your home on the map. Yes your building.

I completely agree. Couldn't say it better! Knowing this sort of information before starting out can save you masses of disappointment later!

Welcome to Buildhub. @LinearPancakes It worth considering all the AIM APE elements before making decisions. That is Airtightness, Insulation, Mechanical Ventilation with Heat Recovery, and Air Source Heat Pump, Photovoltaics and Electric Vehicle. Some of these will not work properly without the others: A MVHR will not work properly without Airtightness. An Air Source Heat Pump will have to compensate for the lack of Airtightness and Insulation to the degree that the benefits become questionable, especially during winter, without them. An ASHP uses electricity and Photovoltaics can supply a little during winter and a lot during summer when cooling can be a problem and an ASHP can supply cooling. PV can supply a little to an Electric Vehicle during winter and plenty during summer if your vehicle is at home during sunny days. So if finances cause you to have to consider only a few in my humble opinion AIM first and go APE later. Good luck with your project and remember the only daft question is the one you didn't ask and don't expect a good answer to your question unless you supply enough information. M

Hi @MikeGrahamT21 Hmm. All this for the ground floor ceiling? Where do I put the plasterboard?

+1

Typical 4 bed semi being renovated: What BC requirement is being achieved when adding fluffy between ground floor ceiling joists. and what would be best to use knowing that its got to stay up whilst being boarded. I'm not sure if it is for sound or thermal resistance. Thanks

Yes, when we ran it through our radiators at 18C we had condensation on the radiators. Also at risk is any uninsulated pipe and the Buffer tank. We are yet to run our coils on cold, however don't forget the coils will create condensation which must drained away somehow.

See. I thought I was missing something!?