MVHR vs Air Con - if you had to pick one?

[saveasteading]

Just now, JohnMo said:

Are you a big building firm massaging the results.

Good point. No I'm being an individual who would design and supervise the process. Ie talking to buildhub not the industry.

An airtight construction but with some flaws, with window vents and a 4" hole in every toilet wall and the kitchen, will get about 3.5. For a better figure, close the vents and covet the fan outlets.

In real life these will all vent the house with or without mvhr.

 

The mass industry will cheat, but the real houses will have plenty of air movement.

[SBMS]

8 minutes ago, Dave Jones said:

As long as you have UFH AND fancoils in all the upstairs rooms you have free aircon.

This was my reasoning. 
 

And I have loxoned everything to death so can automate the immersion (a timer would probably have sufficed like JohnMo said - but does mean I can integrate PV production to top up when it’s generating most). 
 

To respond re eco credentials - it’s a balancing act right? Building a house isn’t an eco statement for me. But where I can I have tried to minimise heat loss with good quality triple glazing, 200mm cavity, airtightness (meaning I need MVHr) etc. Then the home automation and using ASHP for cooling is for comfort and because I like the hobby of tinkering with software and programming. I guess it’s more eco friendly to only have one unit to save resources on building, shipping etc, but wasn’t primary motivator. 
 

the ultimate eco statement is not to build a new house at all probably and buy existing stock - but then most of us wouldn’t be here would we?

[saveasteading]

4 minutes ago, JohnMo said:

 it starts tomorrow

I'm prevaricating too. Just one more coffee and BH post.

[saveasteading]

1 minute ago, SBMS said:

ultimate eco statement is not to build a new house at all probably and buy existing stock -

 Between us and the progeny we are on upgrade/ conversion 8. It is very sustainable/ what we could afford.

My business  was all new build and it is very much easier except that you are juggling client's desires with realities (ye canna change the laws of physics) and their budget.

[Dave Jones]

existing is more of a challenge where there is none/not enough cavity insulation. Compromise is EWI with doggo render or smaller rooms and internal. 

 

Damp being major side effect of poor install would defiantly have networked decentralised MVHR units to take care of any potential issues where there is no room for ducting a normal system.

[Nickfromwales]

1 hour ago, saveasteading said:

The mass industry will cheat, but the real houses will have plenty of air movement.

In winter they’ll have masses of cold air infiltration and bump their heating bills up.